Researcher basic information

• Ph.D., Osaka Prefecture University, 1992

• https://researchmap.jp/read0021106?lang=en

• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200901029666712699
• https://www.agr.hokudai.ac.jp/r/lab/ecological-and-environmental-physicshtml
• https://www.agr.hokudai.ac.jp/en/r/lab/ecological-and-environmental-physics

• 200901029666712699

• Forest ecosystems
• Forest fire
• GHGs
• CO2 balance
• Land use change
• Evapotranspiration
• Energy balance
• Tropical peatland
• Eddy covariance technique
• Soil respiration
• Eddy flux
• Northern peatland
• Micrometeorology
• Agricultural meteorology
• Disturbance

• Environmental Science/Agriculture Science, Agricultural environmental engineering and agricultural information engineering
• Natural Science, Atmospheric and hydrospheric sciences
• Environmental Science/Agriculture Science, Environmental agriculture
• Environmental Science/Agriculture Science, Environmental impact assessment
• Environmental Science/Agriculture Science, Environmental dynamic analysis

• Bachelor's degree program, School of Agriculture
• Master's degree program, Graduate School of Agriculture
• Doctoral (PhD) degree program, Graduate School of Agriculture

Research activity information

• May 2026, Japan Association of International Commission of Agricultural and Biosystems Engineering (JAICABE), JAICABE Award
  森林の二酸化炭素収支の定量化と環境応答の解明
  平野高司
• Jun. 2016, 尾瀬財団, 尾瀬賞
  熱帯泥炭生態系の炭素動態に関するフィールド研究
  平野 高司
• Mar. 2010, 日本農業気象学会, 学術賞
  長期フラックス観測に基づく森林生態系の炭素収支に関する研究
  Japan
• Jul. 1992, 日本農業気象学会, 奨励賞
  植物葉の光合成への粉じんの影響に関する研究
  Japan

• Impacts of Different Monin–Obukhov Parameterizations on Seasonal Turbulent Heat Flux Estimates Over Snow Surfaces
  Hiroki Ikawa; Manabu Nemoto; Takashi Hirano
  Journal of Geophysical Research: Atmospheres, 131, 16, 1, 18, American Geophysical Union (AGU), 22 Aug. 2026, [Peer-reviewed]
  English, Scientific journal, Abstract
  
  Modeling of turbulent heat fluxes over snow surfaces almost exclusively depends on the Monin–Obukhov similarity theory. Within this framework, this study evaluates the impact of different parameterizations, including roughness lengths and stability correction functions, on half‐hourly estimates of sensible heat flux ( H ) and latent heat flux ( λE ) and their seasonal cumulative values over snow surfaces based on eddy covariance data for four winter seasons. The representative roughness lengths for momentum ( z ₀ ), temperature ( z _T ), and water vapor ( z _q ) obtained by optimizing the agreement between modeled and observed H and λE during periods of sufficient snow cover were 7.19 × 10 ⁻³  m, 5.88 × 10 ⁻⁶  m, and 1.26 × 10 ⁻⁸  m, respectively. Furthermore, using dual representative roughness lengths for high‐ and low‐albedo snow conditions improved the agreement between modeled and observed latent heat fluxes. Stable conditions accounted for 37% of the quality‐controlled flux data, and the choice of stability correction functions affected seasonal cumulative H estimates by up to 19%, highlighting the importance of accurately considering stability effects. We propose a simple yet physically interpretable stability correction function ( Ψ ) under stable conditions in the form of Ψ  =  α log(1 +  βζ ), where ζ is the stability parameter and α and β are empirical constants. While the values of α and β are site dependent, the functional form is expected to be applicable across a wide range of sites. Despite the improvement achieved using dual representative roughness lengths, temporal variability in z ₀ remains a key challenge for further improving seasonal cumulative flux estimates.
• Methane emissions from wetlands
  Takashi Hirano; Masahito Ueyama
  Chikyu Kankyo, 31, 49, 59, Jun. 2026, [Peer-reviewed], [Invited], [Lead author, Corresponding author]
  Japanese, Scientific journal, 13443393
• Continuous acceleration of soil heterotrophic respiration over 16 years of soil warming in a sub-boreal forested peatland
  Ruiqi Ma; Kentaro Takagi; Toshiaki Kondo; Jun Koarashi; Mariko Atarashi-Andoh; Kobayashi Makoto; Maricar Aguilos; Kira Ryhti-Laine; Lifei Sun; Yoshiyuki Takahashi; Takashi Hirano; Naishen Liang
  Soil Biology and Biochemistry, 110237, 110237, Elsevier BV, Jun. 2026, [Peer-reviewed]
  English, Scientific journal, 39714811
• Physiological process-based feature engineering enables robust estimation of crop gross primary production under data-limited conditions
  Mizuki Horikoshi; Gaku Yokoyama; Shigehiro Kubota; Taiken Nakashima; Masaharu Kitano; Tadashige Iwao; Koichi Nomura; Takashi Hirano
  Agricultural and Forest Meteorology, 385, 111191, 111191, Elsevier BV, Jun. 2026, [Peer-reviewed], [Last author]
  English, Scientific journal
• Progressive release of long-stored carbon from tropical peatland disturbances
  Jun Koarashi; Masayuki Itoh; Mariko Atarashi-Andoh; Yoko Saito-Kokubu; Makoto Matsueda; Kitso Kusin; Adi Jaya; Salampak Dohong; Takashi Hirano
  Nature Communications, 17, 1, 1, 9, Springer Science and Business Media LLC, 27 May 2026, [Peer-reviewed], [Last author]
  English, Scientific journal, Abstract
  
  Tropical peatlands are globally important, millennia-old carbon sinks, yet unprecedented human-driven degradation is triggering alarming carbon emissions. Comprehensive quantification of carbon dynamics across the disturbance sequence—from peat swamp forests to drained and fire-impacted peatlands—remains a critical knowledge gap. Here we show that over 18 years (1996–2014), drainage and subsequent peat fires released approximately 30–41 kg C m ⁻² from peatlands in Central Kalimantan, Indonesia, using radiocarbon dating of peat profiles and groundwater dissolved organic carbon. Drainage contributed 5–11 kg C m ⁻² , primarily from centuries- to millennium-old, previously waterlogged peat. Fires released 23–32 kg C m ⁻² from peat accumulated over the past 3,000 years, initiating progressive oxidative decomposition of older peat. Extrapolation to Indonesia’s disturbed peatlands suggests a release of 0.81–3.70 Gt C between 1996 and 2014, with ongoing decomposition releasing an additional 0.03–0.08 Gt C annually, accelerating the impact on the global carbon balance., 13443393
• Carbon dioxide dynamics across three stages of tropical peatland conversion to oil palm plantations
  Frankie Kiew; Ryuichi Hirata; Takashi Hirano; Guan Xhuan Wong; Joseph Wenceslaus Waili; Kim San Lo; Kaido Soosaar; Kuno Kasak; Ülo Mander; Lulie Melling
  Agricultural and Forest Meteorology, 378, 110956, 110956, Elsevier BV, Mar. 2026, [Peer-reviewed]
  English, Scientific journal
• Trade-offs between carbon and water fluxes along a land use intensity gradient in Southeast Asian forests and plantations
  Bayu Budi Hanggara; Christian Stiegler; Yoshiaki Hata; Lulie Melling; Tania June; Tomo'omi Kumagai; Takashi Hirano; Alexander Knohl
  Global Change Biology, 32, e70753, Feb. 2026, [Peer-reviewed]
  English, Scientific journal, 13443393
• Impact of Land Use Change and Drought on the Net Emissions of Carbon Dioxide and Methane From Tropical Peatlands in Southeast Asia
  Takashi Hirano; Tomohiro Shiraishi; Ryuichi Hirata; Masato Hayashi; Chandra Shekhar Deshmukh; Lulie Melling; Bettycopa Amit; Masayuki Itoh; Tomomichi Kato; Frankie Kiew; Sofyan Kurnianto; Kitso Kusin; Nardi Nardi; Nurholis Nurholis; Tiara Nales Nyawai; Elisa Rumpang; Ayaka Sakabe; Ari Putra Susanto; Joseph Wenceslaus Waili; Guan Xhuan Wong
  AGU Advances, 6, 6, 1, 22, American Geophysical Union (AGU), 16 Dec. 2025, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal, Abstract
  
  Peat decomposition is progressing in Southeast Asia due to lowered groundwater levels (GWL) caused by drainage. Additionally, droughts during El Niño events significantly lower the GWL, the main environmental factor that controls greenhouse gas (GHG; carbon dioxide (CO ₂ ) and methane) emissions in peatlands. Consequently, tropical peatlands have been recognized as a significant source of carbon emissions, and these emissions have been estimated for the region using constant decomposition rates of peat for each land use (Tier 1 emission factors). However, these factors hardly reflect the spatiotemporal variation of the GWL. Furthermore, these estimates do not account for CO ₂ uptake through photosynthesis. To reduce uncertainty, we developed a method to estimate spatiotemporal GWL variation from satellite‐derived antecedent precipitation. Using the estimated GWL, we calculated the monthly net ecosystem‐scale GHG emissions from peat forests and managed peatlands using the observed relationship between eddy covariance GHG fluxes and GWL, though carbon losses from deforestation, fires, and fluvial export were not covered in this study. Spatiotemporal variations in GHG emissions across Sumatra, Borneo, and the Malay Peninsula over a decade revealed the following: (a) Peat forests are a net source of CO ₂ ‐equivalent GHGs, even when undrained, (b) Decadal mean annual GHG emission rates increase 2.8‐fold when forests are drained and 6.4‐fold when undrained forests are converted to managed peatlands, (c) Droughts increase total annual GHG emissions by 16% across the study area. Additionally, climate models projected precipitation increase in the mid‐21st century, suggesting an increase in GWL and a consequent reduction in peat decomposition., 13443393
• Intraspecific variability in isoprene emission rate of oil palm (Elaeis guineensis)
  Ting-Wei Chang; Noboru Masui; Takashi Hirano; Tiara Nales Nyawai; Mustaqim Rahman; Meilina Ong Abdullah; Akira Tani
  Atmospheric Environment, 361, 121469, 121469, Elsevier BV, Nov. 2025, [Peer-reviewed]
  English, Scientific journal, 13443393
• Modeling diurnal gross primary production in East Asia using Himawari-8/9 geostationary satellite data
  Yuhei Yamamoto; Kazuhito Ichii; Wei Yang; Yui Shikakura; Youngryel Ryu; Minseok Kang; Shohei Murayama; Su-Jin Kim; Yuta Takao; Masahito Ueyama; Tomoko Kawaguchi Akitsu; Hiroki Iwata; Hojin Lee; Junghwa Chun; Atsushi Higuchi; Takashi Hirano; AReum Kim; Hyun Seok Kim; Kenzo Kitamura; Yuji Kominami; Kazuho Matsumoto; Jun Suzuki; Kentaro Takagi; Yoshiyuki Takahashi; Satoru Takanashi; Hideaki Takenaka; Shingo Taniguchi; Yukio Yasuda
  Remote Sensing of Environment, 328, 114866, 114866, Elsevier BV, Oct. 2025, [Peer-reviewed]
  English, Scientific journal
• The Greenhouse Gas Budget of Southeast Asia for 2000–2019 and Pathways Toward Climate Neutrality
  Masayuki Kondo; Prabir K. Patra; Josep G. Canadell; Philippe Ciais; Richard A. Houghton; Akihiko Ito; Chandra S. Deshmukh; Tomo'omi Kumagai; Xiangzhong Luo; Umakant Mishra; Atul K. Jain; Wei Li; Gerbrand Koren; Stephen Sitch; Ben Poulter; Hanqin Tian; Ana Bastos; Ronny Lauerwald; Judith A. Rosentreter; Naveen Chandra; Tazu Saeki; Marielle Saunois; Ingrid T. Luijkx; Takashi Maki; Takashi Nakamura; Kirari Hirabayashi; Takeshi Hirano; Nobuko Saigusa
  Global Biogeochemical Cycles, 39, 9, e2024GB008256, American Geophysical Union (AGU), 24 Sep. 2025, [Peer-reviewed]
  English, Scientific journal, Abstract
  
  Member countries of the Association of Southeast Asian Nations ratified the Paris Agreement and have initiated their own efforts to reduce greenhouse gas (GHG) emissions. However, the progress of these countries toward climate neutrality remains uncertain. Here, we estimated the combined budget for carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O) in Southeast Asia for 2000–2019 using bottom‐up and top‐down approaches. The CO₂ emissions from deforestation were the largest source, followed by anthropogenic fire emissions, which together exceeded the CO₂ uptake by natural vegetation and land‐use change legacy (e.g., regrowth), yielding a net source of CO₂ in the biosphere. The region's biosphere was also a net source of CH₄ and N₂O, which, combined with the CO₂ budget, makes the Southeast Asian biosphere a net source of GHGs to the atmosphere, ranging from 2,003.2 ± 406.1 Tg CO₂eq yr⁻¹ (bottom‐up) to 2,227.5 ± 572.8 Tg CO₂eq yr⁻¹ (top‐down) for 2000–2019. Among non‐biospheric GHG emissions (e.g., fossil fuels and waste‐related emissions), coal usage has resulted in an unprecedented increase in CO₂ emissions. The total GHG budget (the biospheric GHG budget plus the non‐biospheric GHG fluxes) was calculated as a net source of 3,226.3 ± 406.2 Tg CO₂eq yr⁻¹ (bottom‐up) and 3,406.4 ± 572.9 Tg CO₂eq yr⁻¹ (top‐down) for 2000–2019. Our study revealed that Southeast Asia is experiencing the dual challenge of large emissions from deforestation and coal usage, necessitating the implementation of urgent mitigation strategies to ensure climate neutrality.
• The JapanFlux2024 dataset for eddy covariance observations covering Japan and East Asia from 1990 to 2023
  Masahito Ueyama; Yuta Takao; Hiromi Yazawa; Makiko Tanaka; Hironori Yabuki; Tomo'omi Kumagai; Hiroki Iwata; Md. Abdul Awal; Mingyuan Du; Yoshinobu Harazono; Yoshiaki Hata; Takashi Hirano; Tsutom Hiura; Reiko Ide; Sachinobu Ishida; Mamoru Ishikawa; Kenzo Kitamura; Yuji Kominami; Shujiro Komiya; Ayumi Kotani; Yuta Inoue; Takashi Machimura; Kazuho Matsumoto; Yojiro Matsuura; Yasuko Mizoguchi; Shohei Murayama; Hirohiko Nagano; Taro Nakai; Tatsuro Nakaji; Ko Nakaya; Shinjiro Ohkubo; Takeshi Ohta; Keisuke Ono; Taku M. Saitoh; Ayaka Sakabe; Takanori Shimizu; Seiji Shimoda; Michiaki Sugita; Kentaro Takagi; Yoshiyuki Takahashi; Naoya Takamura; Satoru Takanashi; Takahiro Takimoto; Yukio Yasuda; Qinxue Wang; Jun Asanuma; Hideo Hasegawa; Tetsuya Hiyama; Yoshihiro Iijima; Shigeyuki Ishidoya; Masayuki Itoh; Tomomichi Kato; Hiroaki Kondo; Yoshiko Kosugi; Tomonori Kume; Takahisa Maeda; Shoji Matsuura; Trofim Maximov; Takafumi Miyama; Ryo Moriwaki; Hiroyuki Muraoka; Roman Petrov; Jun Suzuki; Shingo Taniguchi; Kazuhito Ichii
  Earth System Science Data, 17, 8, 3807, 3833, Copernicus GmbH, 21 Aug. 2025, [Peer-reviewed]
  English, Scientific journal, Abstract. Eddy covariance observations play a pivotal role in understanding the land–atmosphere exchange of energy, water, carbon dioxide (CO2), and other trace gases, as well as the global carbon cycle and earth system. To promote the networking of individual measurements and the sharing of data, FLUXNET links regional networks of researchers studying land–atmosphere processes. JapanFlux was established in 2006 as a national branch of AsiaFlux. Despite the growing amount of shared data globally, the availability in Asia is currently limited. In this study, we developed an open dataset of the eddy covariance observations for Japan and East Asia, called JapanFlux2024, that was conducted by researchers affiliated with Japanese research institutions. The data were processed using selected standard methods from the FLUXNET community, with adaptations specific to the JapanFlux2024 dataset. Here, we present the data description and data processing and show the value of processed fluxes of sensible heat, latent heat, and CO2. The dataset will facilitate important studies for Japan and East Asia, such as land–atmosphere interactions, improvement of process models, and upscaling fluxes using machine learning and remote sensing technology, as well as bridge collaborations between Asia and FLUXNET.
• Increasing the pH of tropical peat can enhance methane production and methanogenic growth under anoxic conditions
  Kitso Kusin; Kaho Ogawa; Hideyuki Doi; Takeshi Tokida; Takashi Hirano; Adi Jaya; Masayuki Itoh
  CATENA, 250, 108791, 108791, Elsevier BV, Mar. 2025, [Peer-reviewed]
  English, Scientific journal, 13443393
• Impact of land conversion on environmental conditions and methane emissions from a tropical peatland
  Guan Xhuan Wong; Ryuichi Hirata; Takashi Hirano; Frankie Kiew; Joseph Wenceslaus Waili; Ülo Mander; Kaido Soosaar; Lulie Melling
  Science of The Total Environment, 962, 178466, 178466, Elsevier BV, Jan. 2025, [Peer-reviewed]
  English, Scientific journal, 13443393
• Modelling soil heterotrophic respiration within a small area in an immature deciduous forest by machine learning
  Rui HU; Kaho SAKAGUCHI; Takashi HIRANO; Lifei SUN; Naishen LIANG
  Journal of Agricultural Meteorology, 80, 4, 118, 123, Society of Agricultural Meteorology of Japan, Oct. 2024, [Peer-reviewed], [Corresponding author]
  English, Scientific journal, 39714811;45520714
• Solar‐Induced Chlorophyll Fluorescence as a Potential Proxy for Gross Primary Production and Methane Emission in a Cool‐Temperate Bog in Northern Japan
  Kanokrat Buareal; Tomomichi Kato; Tomoki Morozumi; Naohisa Nakashima; Kitpanuwat Tanatarakeree; Masahito Ueyama; Takashi Hirano
  Journal of Geophysical Research: Biogeosciences, 129, 7, American Geophysical Union (AGU), 23 Jul. 2024, [Peer-reviewed], [Last author]
  Scientific journal, Abstract
  
  Wetlands play an essential role in the global greenhouse gas budget via carbon dioxide sequestration as well as methane emission. In recent decades, solar‐induced chlorophyll fluorescence (SIF) has been recognized as a remotely sensed proxy of gross primary productivity (GPP), which generates substrates for methane production. To examine the suitability of SIF for estimation of these two fluxes, we conducted ground tower‐based SIF observation with an ultrafine‐resolution spectroradiometer in conjunction with eddy covariance measurement in a cool‐temperate bog. The daily SIF retrieved in the red (687 nm) and far‐red (760 nm) bands (SIF_red and SIF_far‐red, respectively) increased nonlinearly with GPP and linearly with absorbed photosynthetically active radiation (APAR). The relatively weak correlation between apparent SIF yield (ΦSIF = SIF/APAR) and light use efficiency implied that both APAR and plant physiology constrained the SIF emission in this wetland. The SIF_red/SIF_far‐red ratio showed a significant negative relationship with vegetation greenness indices, and the similar seasonal variation in SIF_red and SIF_far‐red indicated that the SIF_red reabsorption effect only weakly influenced the SIF_red–GPP relationship. Episodic temporal reduction in the water table did not distinctly influence SIF and ΦSIF. Estimation of the methane emission rate was subtly improved by incorporating SIF, which was substituted for GPP as the methanogenesis substrate, in a multivariable regression analysis together with two environmental factors: soil temperature and water table depth. This study illustrates the potential of both SIF_red and SIF_far‐red to monitor GPP and to predict methane emission in wetlands.
• Tropical Peatland Water Table Estimations From Space
  Nikaan Koupaei‐Abyazani; Iuliia Burdun; Ankur R. Desai; Kristell Hergoualc'h; Takashi Hirano; Lulie Melling; Erin Swails; Angela Che Ing Tang; Guan Xhuan Wong
  Journal of Geophysical Research: Biogeosciences, 129, 6, American Geophysical Union (AGU), 18 Jun. 2024, [Peer-reviewed]
  English, Scientific journal, Abstract
  
  Tropical peatlands store copious amounts of carbon (C) and play a critical role in the global C cycle. However, this C store is vulnerable to natural and anthropogenic disturbances, leading these ecosystems to become weaker C sinks or even net C sources. Variabilities in water table (WT) greatly influence the magnitude of greenhouse gas flux in these biomes. Despite its importance in C cycling, observations of the spatiotemporal dynamics of tropical peatland WT are limited in spatial extent and length. Here, we use in situ WT measurements from tropical peatlands in Indonesia, Malaysia, and Peru to evaluate the satellite‐based Optical Trapezoid Model (OPTRAM). The model uses the pixel distribution in the shortwave infrared transformed reflectance and normalized difference vegetation index (NDVI) space to calculate indices that are then compared against in situ WT data. 30‐m resolution Landsat 7 and Landsat 8 images were utilized for model parameterization. We found OPTRAM to best capture tropical peatland WT dynamics in minimally forested and non‐forested areas (low to intermediate NDVI) (0.7 < R < 1) using the “best pixel” approach (the pixel with the highest Pearson‐R correlation value). In areas with relatively higher NDVI, OPTRAM index did not correlate with WT (average R of −0.04 to 0.24), likely due to trees being less sensitive to WT fluctuations. OPTRAM shows potential for reliably estimating tropical peatland WT without the need for direct measurements, which is challenging due to site remoteness and harsh conditions., 13443393
• Large variation in carbon dioxide emissions from tropical peat swamp forests due to disturbances
  Takashi Hirano; Shinjiro Ohkubo; Masayuki Itoh; Hayato Tsuzuki; Ayaka Sakabe; Hidenori Takahashi; Kitso Kusin; Mitsuru Osaki
  Communications Earth & Environment, 5, 1, 1, 9, Springer Science and Business Media LLC, 25 Apr. 2024, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal, Abstract
  
  The huge carbon stock of tropical peat swamp forest (PSF) in Southeast Asia has been threatened by environmental disturbances due to quasi-periodic El Niño-Southern Oscillation (ENSO) droughts, biomass and peat burning, smoke haze, drainage, and deforestation. Carbon dioxide (CO₂) emissions from such disturbances have not been well quantified because of insufficient field data. Therefore, we quantified the ecosystem-scale CO₂ balance and examine the disturbance effects from a long-term field experiment for 12–15 years at three PSF sites with different degrees of degradation in Indonesia. Here, we show a drastic change of an undrained PSF from a CO₂ sink to a source owing to the transient groundwater lowering by the droughts, a significant decrease in ecosystem photosynthesis due to the radiation attenuation by smoke haze in drought years, and long-lasting CO₂ emissions through enhanced peat decomposition by drainage. The impact on CO₂ emissions was greater from drainage than drought-induced disturbances., 39714811;13443393;11048446;10554782;10180060
• Upscaling Wetland Methane Emissions From the FLUXNET‐CH4 Eddy Covariance Network (UpCH4 v1.0): Model Development, Network Assessment, and Budget Comparison
  Gavin McNicol; Etienne Fluet‐Chouinard; Zutao Ouyang; Sara Knox; Zhen Zhang; Tuula Aalto; Sheel Bansal; Kuang‐Yu Chang; Min Chen; Kyle Delwiche; Sarah Feron; Mathias Goeckede; Jinxun Liu; Avni Malhotra; Joe R. Melton; William Riley; Rodrigo Vargas; Kunxiaojia Yuan; Qing Ying; Qing Zhu; Pavel Alekseychik; Mika Aurela; David P. Billesbach; David I. Campbell; Jiquan Chen; Housen Chu; Ankur R. Desai; Eugenie Euskirchen; Jordan Goodrich; Timothy Griffis; Manuel Helbig; Takashi Hirano; Hiroki Iwata; Gerald Jurasinski; John King; Franziska Koebsch; Randall Kolka; Ken Krauss; Annalea Lohila; Ivan Mammarella; Mats Nilson; Asko Noormets; Walter Oechel; Matthias Peichl; Torsten Sachs; Ayaka Sakabe; Christopher Schulze; Oliver Sonnentag; Ryan C. Sullivan; Eeva‐Stiina Tuittila; Masahito Ueyama; Timo Vesala; Eric Ward; Christian Wille; Guan Xhuan Wong; Donatella Zona; Lisamarie Windham‐Myers; Benjamin Poulter; Robert B. Jackson
  AGU Advances, 4, 5, 1, 24, American Geophysical Union (AGU), 06 Sep. 2023, [Peer-reviewed]
  English, Scientific journal, Abstract
  
  Wetlands are responsible for 20%–31% of global methane (CH₄) emissions and account for a large source of uncertainty in the global CH₄ budget. Data‐driven upscaling of CH₄ fluxes from eddy covariance measurements can provide new and independent bottom‐up estimates of wetland CH₄ emissions. Here, we develop a six‐predictor random forest upscaling model (UpCH4), trained on 119 site‐years of eddy covariance CH₄ flux data from 43 freshwater wetland sites in the FLUXNET‐CH4 Community Product. Network patterns in site‐level annual means and mean seasonal cycles of CH₄ fluxes were reproduced accurately in tundra, boreal, and temperate regions (Nash‐Sutcliffe Efficiency ∼0.52–0.63 and 0.53). UpCH4 estimated annual global wetland CH₄ emissions of 146 ± 43 TgCH₄ y⁻¹ for 2001–2018 which agrees closely with current bottom‐up land surface models (102–181 TgCH₄ y⁻¹) and overlaps with top‐down atmospheric inversion models (155–200 TgCH₄ y⁻¹). However, UpCH4 diverged from both types of models in the spatial pattern and seasonal dynamics of tropical wetland emissions. We conclude that upscaling of eddy covariance CH₄ fluxes has the potential to produce realistic extra‐tropical wetland CH₄ emissions estimates which will improve with more flux data. To reduce uncertainty in upscaled estimates, researchers could prioritize new wetland flux sites along humid‐to‐arid tropical climate gradients, from major rainforest basins (Congo, Amazon, and SE Asia), into monsoon (Bangladesh and India) and savannah regions (African Sahel) and be paired with improved knowledge of wetland extent seasonal dynamics in these regions. The monthly wetland methane products gridded at 0.25° from UpCH4 are available via ORNL DAAC (https://doi.org/10.3334/ORNLDAAC/2253).
• Spatiotemporal variation in soil methane uptake in a cool-temperate immature deciduous forest
  Rui Hu; Takashi Hirano; Kaho Sakaguchi; Syunpei Yamashita; Rui Cui; Lifei Sun; Naishen Liang
  Soil Biology and Biochemistry, 184, 109094, 109094, Elsevier BV, Sep. 2023, [Peer-reviewed], [Corresponding author]
  English, Scientific journal
• Carbon dioxide emissions through land use change, fire, and oxidative peat decomposition in Borneo
  Tomohiro Shiraishi; Ryuichi Hirata; Masato Hayashi; Takashi Hirano
  Scientific Reports, 13, 1, Springer Science and Business Media LLC, 11 Aug. 2023, [Peer-reviewed], [Last author]
  English, Scientific journal, Abstract
  
  Borneo has accumulated an abundance of woody carbon in its forests and peat. However, agricultural land conversion accompanied by plantation development, dead wood burning, and peat drying from drainage are major challenges to climate change mitigation. This study aimed to develop a method of estimating carbon dioxide (CO₂) emissions from land use change, forest and peat fires, and oxidative peat decomposition, and CO₂ uptake from biomass growth across Borneo using remote sensing data from 2001 to 2016. Although CO₂ uptake by biomass growth in vast forests has shown a significant increasing trend, an annual net release of 461.10 ± 436.51 (average ± 1 standard deviation) Tg CO₂ year⁻¹ was observed. The estimated emissions were predominantly characterized by land use changes from 2001 to 2003, with the highest emissions in 2001. Land use change was evaluated from annual land use maps with an accuracy of 92.0 ± 1.0% (average ± 1 standard deviation). Forest and peat fires contributed higher emissions in 2002, 2006, 2009, 2014, and 2015 compared to other years and were strongly correlated with the Southern Oscillation Indexes. These results suggest that more CO₂ may have been released into the atmosphere than previously thought., 13443393
• Influence of disturbance on transpiration and evaporation in tropical peat swamp forests
  Shinjiro Ohkubo; Takashi Hirano; Kitso Kusin
  Journal of Hydrology, 620, 129523, 129523, Elsevier BV, May 2023, [Peer-reviewed]
  English, Scientific journal, 13443393;10554782
• Net greenhouse gas balance of fibre wood plantation on peat in Indonesia
  Chandra S. Deshmukh; Ari P. Susanto; Nardi Nardi; Nurholis Nurholis; Sofyan Kurnianto; Yogi Suardiwerianto; M. Hendrizal; Ade Rhinaldy; Reyzaldi E. Mahfiz; Ankur R. Desai; Susan E. Page; Alexander R. Cobb; Takashi Hirano; Frédéric Guérin; Dominique Serça; Yves T. Prairie; Fahmuddin Agus; Dwi Astiani; Supiandi Sabiham; Chris D. Evans
  Nature, 616, 7958, 740, 746, Springer Science and Business Media LLC, 05 Apr. 2023, [Peer-reviewed]
  English, Scientific journal, Abstract
  
  Tropical peatlands cycle and store large amounts of carbon in their soil and biomass^1–5. Climate and land-use change alters greenhouse gas (GHG) fluxes of tropical peatlands, but the magnitude of these changes remains highly uncertain^6–19. Here we measure net ecosystem exchanges of carbon dioxide, methane and soil nitrous oxide fluxes between October 2016 and May 2022 from Acacia crassicarpa plantation, degraded forest and intact forest within the same peat landscape, representing land-cover-change trajectories in Sumatra, Indonesia. This allows us to present a full plantation rotation GHG flux balance in a fibre wood plantation on peatland. We find that the Acacia plantation has lower GHG emissions than the degraded site with a similar average groundwater level (GWL), despite more intensive land use. The GHG emissions from the Acacia plantation over a full plantation rotation (35.2 ± 4.7 tCO₂-eq ha⁻¹ year⁻¹, average ± standard deviation) were around two times higher than those from the intact forest (20.3 ± 3.7 tCO₂-eq ha⁻¹ year⁻¹), but only half of the current Intergovernmental Panel on Climate Change (IPCC) Tier 1 emission factor (EF)²⁰ for this land use. Our results can help to reduce the uncertainty in GHG emissions estimates, provide an estimate of the impact of land-use change on tropical peat and develop science-based peatland management practices as nature-based climate solutions.
• Peatland groundwater level in the Indonesian maritime continent as an alert for El Niño and moderate positive Indian Ocean dipole events
  Albertus Sulaiman; Mitsuru Osaki; Hidenori Takahashi; Manabu D. Yamanaka; Raden Dwi Susanto; Sawahiko Shimada; Keiji Kimura; Takashi Hirano; Rahmawati Ihsani Wetadewi; Silsigia Sisva; Tsuyoshi Kato; Osamu Kozan; Hideyuki Kubo; Awaluddin Awaluddin; Nobuyuki Tsuji
  Scientific Reports, 13, 1, 939, Springer Science and Business Media LLC, 18 Jan. 2023, [Peer-reviewed]
  English, Scientific journal, Abstract
  
  In general, it is known that extreme climatic conditions such as El Niño and positive Indian Ocean Dipole (IOD+) cause prolonged drought in Indonesia's tropical peatlands so that groundwater levels (GWL) drop and peat is prone to fire. However, 27 years of GWL measurements in Central Kalimantan peat forests show the opposite condition, where the lowest GWL occurs several weeks before El Niño and after IOD+ reaches its peaks. We show that the dropped sea surface temperature anomaly induced by anomalously easterly winds along the southern Java-Sumatra occurs several weeks before the GWL drop to the lowest value. Local rainfall decreased, and GWL dropped sharply by 1.0 to 1.5 m, during the super El Niño events in 1997/98 and 2015, as well as remarkable events of IOD+ in 2019. It is suggested that the tropical peatland ecohydrological system (represented by the GWL), El Niño Southern Oscillation (ENSO), and IOD+ are teleconnected. Hence, monitoring GWL variability of peatland over the IMC is a possibility an alert for extreme climate events associated with El Niño and/or moderate IOD+.
• Modeled production, oxidation and transport processes of wetland methane emissions in temperate, boreal, and Arctic regions
  Masahito Ueyama; Sara H. Knox; Kyle B. Delwiche; Sheel Bansal; William J. Riley; Dennis Baldocchi; Takashi Hirano; Gavin McNicol; Karina Schafer; Lisamarie Windham‐Myers; Benjamin Poulter; Robert B. Jackson; Kuang‐Yu Chang; Jiquen Chen; Housen Chu; Ankur R. Desai; Sébastien Gogo; Hiroki Iwata; Minseok Kang; Ivan Mammarella; Matthias Peichl; Oliver Sonnentag; Eeva‐Stiina Tuittila; Youngryel Ryu; Eugénie S. Euskirchen; Mathias Göckede; Adrien Jacotot; Mats B. Nilsson; Torsten Sachs
  Global Change Biology, Wiley, 11 Jan. 2023, [Peer-reviewed]
  English, Scientific journal
• Carbon dioxide emissions from frond decomposition in oil palm plantations on tropical peat
  Wakhid N; Hirano T
  Journal of Oil Palm Research, Malaysian Palm Oil Board, 19 Oct. 2022, [Peer-reviewed]
  English, Scientific journal, 13443393
• Carbon loss from aboveground woody debris generated through land conversion from a secondary peat swamp forest to an oil palm plantation
  Takashi Hirano; Guan Xhuan Wong; Joseph Wenceslaus Waili; Kim San Lo; Frankie Kiew; Edward Baran Aeries; Ryuichi Hirata; Kiwamu Ishikura; Masato Hayashi; Shoko Murata; Tomohiro Shiraishi; Masayuki Itoh; Lulie Melling
  Journal of Agricultural Meteorology, 78, 4, 137, 146, Society of Agricultural Meteorology of Japan, 10 Oct. 2022, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal, 13443393;35708948;11993520
• Warming response of peatland CO2 sink is sensitive to seasonality in warming trends
  M. Helbig; T. Živković; P. Alekseychik; M. Aurela; T. S. El-Madany; E. S. Euskirchen; L. B. Flanagan; T. J. Griffis; P. J. Hanson; J. Hattakka; C. Helfter; T. Hirano; E. R. Humphreys; G. Kiely; R. K. Kolka; T. Laurila; P. G. Leahy; A. Lohila; I. Mammarella; M. B. Nilsson; A. Panov; F. J. W. Parmentier; M. Peichl; J. Rinne; D. T. Roman; O. Sonnentag; E.-S Tuittila; M. Ueyama; T. Vesala; P. Vestin; S. Weldon; P. Weslien; S. Zaehle
  Nature Climate Change, 12, 8, 743, 749, Springer Science and Business Media LLC, Aug. 2022, [Peer-reviewed]
  English, Scientific journal
• Partitioning of root respiration into growth, maintenance, and ion uptake components in a young larch-dominated forest
  Takashi Hirano; Rui Cui; Lifei Sun; Munemasa Teramoto; Naishen Liang
  PLANT AND SOIL, Aug. 2022, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• The Potential of Peatlands as Nature-Based Climate Solutions
  Maria Strack; Scott J. Davidson; Takashi Hirano; Christian Dunn
  Current Climate Change Reports, 8, 3, 71, 82, Springer Science and Business Media LLC, 13 Jun. 2022, [Peer-reviewed], [Invited]
  English, Scientific journal, 13443393
• Partitioning methane flux by the eddy covariance method in a cool temperate bog based on a Bayesian framework
  Masahito UEYAMA; Tomotsugu YAZAKI; Takashi HIRANO; Ryosuke ENDO
  Agricultural and Forest Meteorology, 316, 108852, 108852, Elsevier BV, Apr. 2022, [Peer-reviewed]
  English, Scientific journal
• Tropical Peatland Hydrology Simulated With a Global Land Surface Model
  S. Apers; G. J; M. De Lannoy; A. J. Baird; A. R. Cobb; G. C. Dargie; J. Pasquel; A. Gruber; A. Hastie; H. Hidayat; T. Hirano; A. M. Hoyt; A. J. Jovani‐Sancho; A. Katimon; A. Kurnain; R. D. Koster; M. Lampela; S. P. P. Mahanama; L. Melling; S. E. Page; R. H. Reichle; M. Taufik; J. Vanderborght; M. Bechtold
  Journal of Advances in Modeling Earth Systems, 14, 3, American Geophysical Union (AGU), Mar. 2022, [Peer-reviewed]
  English, Scientific journal, 13443393
• Net primary production of oil palm plantations on tropical peat
  Wakhid N; Hirano T; Dariah A; Agus F
  Mires and Peat, 28, 2, 1, 12, 2022, [Peer-reviewed]
  English, Scientific journal
• Exploring a best vegetation index to explain the seasonal variation of a forest photosynthesis using a hyper-spectral camera equipped with liquid crystal tunable filter
  Yoshikawa K; Takagi K; Yazaki T; Hirano T; Hayakashi S; Ide R; Oguma H; Hirose Y; Kurihara J
  Journal of Agricultural Meteorology, 78, 4, 223, 261, Oct. 2021, [Peer-reviewed], [International Magazine]
  English, Scientific journal, 10554784

  
  Preprint
• Variation in biomass, production and respiration of fine roots in a young larch forest
  Cui R; Hirano T; Sun L; Teramoto M; Liang N
  Journal of Agricultural Meteorology, 77, 3, 167, 178, Jul. 2021, [Peer-reviewed], [Corresponding author], [International Magazine]
  English, Scientific journal, 11747475

  
  Preprint
• Carbon flux measurement in forest ecosystems
  Takashi Hirano
  Chikyu Kankyo, 26, 1-2, 57, 68, 2021, [Peer-reviewed], [Invited], [Lead author, Corresponding author]
  Japanese, Scientific journal, 13443393
• Influence of fire and drainage on evapotranspiration in a degraded peat swamp forest in Central Kalimantan, Indonesia
  Ohkubo S; Hirano T; Kusin K
  Journal of Hydrology, 603, 126906, 126906, Elsevier BV, 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 13443393;35708948
• Gap-filling eddy covariance methane fluxes: Comparison of machine learning model predictions and uncertainties at FLUXNET-CH4 wetlands
  Irvin J; Zhou S; McNicol G; Lu F; Liu V; Fluet-Chouinard E; Ouyang Z; Knox SH; Lucas-Moffat A; Trotta C; Papale D; Vitale D; Mammarella I; Alekseychik P; Aurela M; Avati A; Baldocchi D; Bansal S; Bohrer G; Campbell DI; Chen J; Chu H; Dalmagro HJ; Delwiche KB; Desai AR; Euskirchen E; Feron S; Goeckede M; Heimann M; Helbig M; Helfter C; Hemes KS; Hirano T; Iwata H; Jurasinski G; Kalhori A; Kondrich A; Lai DYF; Lohila A; Malhotra A; Merbold L; Mitra B; Ng A; Nilsson MB; Noormets A; Peichl M; Rey-Sanchez AC; Richardson AD; Runkle BRK; Schafer KVR; Sonnentag O; Stuart-Ha; entjens E; Sturtevant C; Ueyama M; Valach AC; Vargas R; Vourlitis GL; Ward EJ; Wong GX; Zona D; Alberto MCR; Billesbach DP; Celis G; Dolman H; Friborg T; Fuchs K; Gogo S; Gondwe MJ; Goodrich JP; Gottschalk P; Hortnagl L; Jacotot L; Koebsch L; Kasak K; Maier R; Morin TH; Nemitz E; Oechel WC; Oikawa PY; Ono K; Sachs T; Sakabe A; Schuur EA; Shortt R; Sullivan RC; Szutu DJ; Tuittila ES; Varlagin A; Verfaillie JG; Wille C; Windham-Myers L; Poulter B; Jackson RB
  Agricultural and Forest Meteorology, 308-309, 108528, 108528, Elsevier BV, 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Soil CO2 emissions and net primary production of an oil palm plantation established on tropical peat
  Wakhid N; Hirano T
  Mires and Peat, 27, Article 13, 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 13443393;35708948
• Assessing the carbon dioxide balance of a degraded tropical peat swamp forest following multiple fire events of different intensities
  Ohkubo S; Hirano T; Kusin K
  Agricultural and Forest Meteorology, 306, 108448, 2021, [Peer-reviewed], [Corresponding author], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 13443393;35708948
• New inventories of global carbon dioxide emissions through 2 biomass burning in 2001–2018
  Tomohiro Shiraishi; Ryuichi Hirata; Takashi Hirano
  Remote Sensing, 13, 1914, 2021, [Peer-reviewed], [International Magazine]
  English, Scientific journal
• FLUXNET-CH4: A global, multi-ecosystem dataset and analysis of methane seasonality from freshwater wetlands
  Kyle B. Delwiche; Sara Helen Knox; Avni Malhotra; Etienne Fluet-Chouinard; Gavin McNicol; Sarah Feron; Zutao Ouyang; Dario Papale; Carlo Trotta; Eleonora Canfora; You-Wei Cheah; Danielle Christianson; M. Carmelita; R. Alberto; Pavel Alekseychik; Mika Aurela; Dennis Baldocchi; Sheel Bansal; David P. Billesbach; Gil Bohrer; Rosvel Bracho; Nina Buchmann; David I. Campbell; Gerardo Celis; Jiquan Chen; Weinan Chen; Housen Chu; Higo J. Dalmagro; Sigrid Denge; Ankur R. Desai; Matteo Detto; Han Dolman; Elke Eichelmann; Eugenie Euskirchen; Daniela Famulari; Thomas Friborg; Kathrin Fuchs; Mathias Goeckede; Sébastien Gogo; Mangaliso J. Gondwe; Jordan; P. Goodrich; Pia Gottschalk; Scott L. Graham; Martin Heimann; Manuel Helbig; Carole Helfter; Kyle S. Hemes; Takashi Hirano; David Hollinger; Lukas Hörtnagl; Hiroki Iwata; Adrien Jacotot; Joachim Jansen; Gerald Jurasinski; Minseok Kang; Kuno Kasak; John King; Janina Klatt; Franziska Koebsch; Ken W. Krauss; Derrick Y; F. Lai; Ivan Mammarella; Giovanni Manca; Luca Belelli Marchesini; Jaclyn Hatala Matthes; Trofim Maximon; Lutz Merbold; Bhaskar Mitra; Timothy H. Morin; Eiko Nemitz; Mats B. Nilsson; Shuli Niu; Walter C. Oechel; Patricia Y. Oikawa; Keisuke Ono; Matthias Peichl; Olli Peltola; Michele L. Reba; Andrew D. Richardson; William Riley; Benjamin R; K. Runkle; Youngryel Ryu; Torsten Sachs; Ayaka Sakabe; Camilo Rey Sanchez; Edward A. Schuur; Karina V; R. Schäfer; Oliver Sonnentag; Jed; P. Sparks; Ellen Stuart-Haëntjens; Cove Sturtevant; Ryan C. Sullivan; Daphne J. Szutu; Jonathan E. Thom; Margaret S. Torn; Eeva-Stiina Tuittila; Jessica Turner; Masahito Ueyama; Alex C. Valach; Rodrigo Vargas; Andrej Varlagin; Alma Vazquez-Lule; Joseph G. Verfaillie; Timo Vesala; George L. Vourlitis; Eric J. Ward; Christian Wille; Georg Wohlfahrt; Guan Xhuan Wong; Zhen Zhang; Donatella Zona; Lisamarie Windham-Myers; Benjamin Poulter; Robert B. Jackson
  Earth System Science Data, 13, 367, 3689, Copernicus GmbH, 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, Abstract. Methane (CH4) emissions from natural landscapes constitute roughly half of global CH4 contributions to the atmosphere, yet large uncertainties remain in the absolute magnitude and the seasonality of emission quantities and drivers. Eddy covariance (EC) measurements of CH4 flux are ideal for constraining ecosystem-scale CH4 emissions, including their seasonality, due to quasi-continuous and high temporal resolution of flux measurements, coincident measurements of carbon, water, and energy fluxes, lack of ecosystem disturbance, and increased availability of datasets over the last decade. Here, we 1) describe the newly published dataset, FLUXNET-CH4 Version 1.0, the first global dataset of CH4 EC measurements (available at https://fluxnet.org/data/fluxnet-ch4- community-product/). FLUXNET-CH4 includes half-hourly and daily gap-filled and non gap-filled aggregated CH4 fluxes and meteorological data from 79 sites globally: 42 freshwater wetlands, 6 brackish and saline wetlands, 7 formerly drained ecosystems, 7 rice paddy sites, 2 lakes, and 15 uplands. Then, we 2) evaluate FLUXNET-CH4 representativeness for freshwater wetland coverage globally, because the majority of sites in FLUXNET-CH4 Version 1.0 are freshwater wetlands and because freshwater wetlands are a substantial source of total atmospheric CH4 emissions; and 3) provide the first global estimates of the seasonal variability and seasonality predictors of freshwater wetland CH4 fluxes. Our representativeness analysis suggests that the freshwater wetland sites in the dataset cover global wetland bioclimatic attributes (encompassing energy, moisture, and vegetation-related parameters) in arctic, boreal, and temperate regions, but only sparsely cover humid tropical regions. Seasonality metrics of wetland CH4 emissions vary considerably across latitudinal bands. In freshwater wetlands (except those between 20° S to 20° N) the spring onset of elevated CH4 emissions starts three days earlier, and the CH4 emission season lasts 4 days longer, for each degree C increase in mean annual air temperature. On average, the onset of increasing CH4 emissions lags soil warming by one month, with very few sites experiencing increased CH4 emissions prior to the onset of soil warming. In contrast, roughly half of these sites experience the spring onset of rising CH4 emissions prior to the spring increase in gross primary productivity (GPP). The timing of peak summer CH4 emissions does not correlate with the timing for either peak summer temperature or peak GPP. Our results provide seasonality parameters for CH4 modeling, and highlight seasonality metrics that cannot be predicted by temperature or GPP (i.e., seasonality of CH4 peak). The FLUXNET-CH4 dataset provides an open-access resource for CH4 flux synthesis, has a range of applications, and is unique in that it includes coupled measurements of important CH4 drivers such as GPP and temperature. Although FLUXNET-CH4 could certainly be improved by adding more sites in tropical ecosystems and by increasing the number of site-years at existing sites, it is a powerful new resource for diagnosing and understanding the role of terrestrial ecosystems and climate drivers in the global CH4 cycle. All seasonality parameters are available at https://doi.org/10.5281/zenodo.4408468. Additionally, raw FLUXNET-CH4 data used to extract seasonality parameters can be downloaded from https://fluxnet.org/data/fluxnet-ch4-community-product/, and a complete list of the 79 individual site data DOIs is provided in Table 2 in the Data Availability section of this document.
• Identifying dominant environmental predictors of freshwater wetland methane fluxes across diurnal to seasonal time scales
  Sara Helen Knox; Sheel Bansal; Gavin McNicol; Karina Schafer; Cove Sturtevant; Masahito Ueyama; Alex C. Valach; Dennis Baldocchi; Kyle Delwiche; Ankur R Desai; Eugenie Euskirchen; Jinxun Liu; Annalea Lohila; Avni Malhotra; Lulie Melling; William Riley; Benjamin R; K. Runkle; Jessica Turner; Rodrigo Vargas; Qing Zhu; Tuula Alto; Etienne Fluet-Chouinard; Mathias Goeckede; Joe R. Melton; Oliver Sonnentag; Timo Vesala; Eric Ward; Zhen Zhang; Sarah Feron; Zutao Ouyang; Pavel Alekseychik; Mika Aurela; Gil Bohrer; David I. Campbell; Jiquan Chen; Housen Chu; Higo J; Dalmagro; Jordan; P. Goodrich; Pia Gottschalk; Takashi Hirano; Hiroki Iwata; Gerald Jurasinski; Minseok Kang; Franziska Koebsch; Ivan Mammarella; Mats B. Nilsson; Keisuke Ono; Matthias Peichl; Olli Peltola; Youngryel Ryu; Torsten Sachs; Ayaka Sakabe; Jed Sparks; Eeva-Stiina Tuittila; George L Vourlitis; Guan Xhuan Wong; Lisamarie Windham-Myers; Ben Poulter; Robert B. Jackson
  Global Change Biology, 27, 15, 3582, 3604, Wiley, 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions
  Kuang-Yu Chang; William J. Riley; Sara H. Knox; Robert B. Jackson; Gavin McNicol; Benjamin Poulter; Mika Aurela; Dennis Baldocchi; Sheel Bansal; Gil Bohrer; David I. Campbell; Alessandro Cescatti; Housen Chu; Kyle B. Delwiche; Ankur R. Desai; Eugenie Euskirchen; Thomas Friborg; Mathias Goeckede; Manuel Helbig; Kyle S. Hemes; Takashi Hirano; Hiroki Iwata; Minseok Kang; Trevor Keenan; Ken W. Krauss; Annalea Lohila; Ivan Mammarella; Bhaskar Mitra; Akira Miyata; Mats B. Nilsson; Asko Noormets; Walter C. Oechel; Dario Papale; Matthias Peichl; Michele L. Reba; Janne Rinne; Benjamin R; K. Runkle; Youngryel Ryu; Torsten Sachs; Karina V; R. Schäfer; Hans Peter Schmid; Narasinha Shurpali; Oliver Sonnentag; Angela C. I. Tang; Margaret S. Torn; Carlo Trotta; Eeva-Stiina Tuittila; Masahito Ueyama; Rodrigo Vargas; Timo Vesala; Lisamarie Windham-Myers; Zhen Zhang; Donatella Zona
  Nature Communications, 12, 2266, 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Influence of disturbances and environmental changes on albedo in tropical peat ecosystems
  Ohkubo S; Hirano T; Kusin K
  Agricultural and Forest Meteorology, 301-302, 108348, 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 13443393;35708948
• Inferring CO2 fertilization effect based on global monitoring land-atmosphere exchange with a theoretical model
  Ueyama, Masahito; Ichii, Kazuhito; Kobayashi, Hideki; Kumagai, Tomo'omi; Beringer, Jason; Merbold, Lutz; Euskirchen, Eugenie S; Hirano, Takashi; {Belelli Marchesini}, Luca; Baldocchi, Dennis; Saitoh, Taku M.; Mizoguchi, Yasuko; Ono, Keisuke; Kim, Joon; Varlagin, Andrej; Kang, Minseok; Shimizu, Takanori; Kosugi, Yoshiko; Bret-Harte, Marion Syndonia (Donie); Machimura, Takashi; Matsuura, Yojiro; Ohta, Takeshi; Takagi, Kentaro; Takanashi, Satoru; Yasuda, Yukio
  Environmental Research Letters, 15, 084009, IOP Publishing, Feb. 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 10554782
• COSORE: A community database for continuous soil respiration and other soil-atmosphere greenhouse gas flux data
  Ben Bond-Lamberty; Danielle S. Christianson; Avni Malhotra; Stephanie C. Pennington; Debjani Sihi; Amir AghaKouchak; Hassan Anjileli; M. Altaf Arain; Juan J. Armesto; Samaneh Ashraf; Mioko Ataka; Dennis Baldocchi; Thomas Andrew Black; Nina Buchmann; Mariah S. Carbone; Shih-Chieh Chang; Patrick Crill; Peter S. Curtis; Eric A. Davidson; Ankur R. Desai; John E. Drake; Tarek S. El-Madany; Michael Gavazzi; Carolyn-Monika Görres; Christopher M. Gough; Michael Goulden; Jillian Gregg; Omar Gutiérrez del Arroyo; Jin-Sheng He; Takashi Hirano; Anya Hopple; Holly Hughes; Järvi Järveoja; Rachhpal Jassal; Jinshi Jian; Haiming Kan; Jason Kaye; Yuji Kominami; Naishen Liang; David Lipson; Catriona A. Macdonald; Kadmiel Maseyk; Kayla Mathes; Marguerite Mauritz; Melanie A. Mayes; Steve McNulty; Guofang Miao; Mirco Migliavacca; Scott Miller; Chelcy F. Miniat; Jennifer G. Nietz; Mats B. Nilsson; Asko Noormets; Hamidreza Norouzi; Christine S. O’Connell; Bruce Osborne; Cecilio Oyonarte; Zhuo Pang; Matthias Peichl; Elise Pendall; Jorge F. Perez-Quezada; Claire L. Phillips; Richard P. Phillips; James W. Raich; Alexandre A. Renchon; Nadine K. Ruehr; Enrique P; Sánchez-Cañete; Matthew Saunders; Kathleen E. Savage; Marion Schrumpf; Russell L. Scott; Ulli Seibt; Whendee L. Silver; Wu Sun; Daphne Szutu; Kentaro Takagi; Masahiro Takagi; Munemasa Teramoto; Mark G. Tjoelker; Susan Trumbore; Masahito Ueyam; Rodrigo Vargas; Ruth K. Varner; Joseph Verfaillie; Christoph Vogel; Jinsong Wang; Greg Winston; Tana E. Wood; Juying Wu; Thomas Wutzler; Jiye Zeng; Tianshan Zha; Quan Zhang; Junliang Zou
  Global Change Biology, 26, 12, 7268, 7283, 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 10554782
• Carbon dioxide balance of an oil palm plantation established on tropical peat
  Kiew F; Hirata R; Hirano T; Wong GX; Aries EB; Kemudang K; Wenceslaus J; Lo KS; Melling L
  Agricultural and Forest Meteorology, 295, 108189, 2020, [Peer-reviewed], [Corresponding author], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 11048446
• Environmental controls on methane fluxes in a cool temperate bog
  Ueyama M; Yazaki T; Hirano T; Futakuchi Y; Okamura M
  Agricultural and Forest Meteorology, 281, 107852, 2020, [Peer-reviewed], [International Magazine]
  English, Scientific journal
• How do land use practices affect methane emissions from tropical peat ecosystems?
  Wong G; Hirata R; Hirano T; Kiew F; Aeries E; Musin K; Waili J; Lo K; Melling L
  Agricultural and Forest Meteorology, 282-283, 107869, 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 13443393
• Carbon Dioxide and Methane Emissions from Peat Soil in an Undrained Tropical Peat Swamp Forest
  Ishikura K; Hirata R; Hirano T; Okimoto Y; Wong GX; Melling L; Aeries EB; Kiew F; Lo KS; Musin KK; Waili JW; Ishii Y
  Ecosystems, 22, 8, 1852, 1868, Springer Science and Business Media LLC, Dec. 2019, [Peer-reviewed], ［Internationally co-authored］
  English, Scientific journal, 11048446
• Fine root dynamics and partitioning of root respiration into growth and maintenance components in cool temperate deciduous and evergreen forests
  Sun L; Hirano T; Yazaki T; Teramoto M; Liang N
  Plant and Soil, 446, 1-2, 471, 486, Springer Science and Business Media LLC, Nov. 2019, [Peer-reviewed], [Corresponding author], [International Magazine]
  English, Scientific journal, 11747475
• Sensitivity analysis of the typhoon disturbance effect on forest dynamics and carbon balance in the future at a cool-temperate forest in northern Japan by using SEIB-DGVM
  Wu L; Kato T; Sato H; Hirano T; Yazaki T
  Forest Ecology and Management, 451, 117529, 117529, Elsevier BV, Nov. 2019, [Peer-reviewed], [International Magazine]
  English, Scientific journal, 10554784
• Peatland Carbon Emissions Estimates by ALOS-2 PALSAR-2 Interferometry in Borneo
  Masato Hayashi; Takahiro Abe; Takashi Hirano; Ryuichi Hirata; Tomohiro Shiraishi; Lulie Melling
  IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, IEEE, Jul. 2019
  International conference proceedings
• Surface conductance for evapotranspiration of tropical forests: calculations, variations, and controls
  Zheng-Hong Tan; JUNFU ZHAO; Guanze Wang; Meng-Ping Chen; Lianyan Yang; Chunsheng He; Natalia Restrepo-Coupe; Shushi Peng; Xueyan Liu; Humberto R da Rocha; Yoshiko Kosugi; Takashi Hirano; Scott Saleska; Michael Goulden; Jiye Zeng; Fangjun Ding; Fu Gao; Liang Song
  Agricultural and Forest Meteorology, 275, 317, 328, 2019, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• FLUXNET-CH4 Synthesis Activity: Objectives, Observations, and Future Directions
  Sara H. Knox; Robert Jackson; Benjamin Poulter; Gavin McNicol; Etienne Fluet-Chouinard; Zhen Zhang; Gustaf Hugelius; Philippe Bousquet; Josep G. Canadell; Marielle Saunois; Dario Papale; Housen Chu; Trevor F. Keenan; DenniS Baldocchi; Margaret S. Torn; Ivan Mammarella; Carlo Trotta; Mika Aurela; Gil Bohrer; David I. Campbell; Alessandro Cescatti; Samuel Chamberlain; Jiquan Chen; Weinan Chen; Sigrid Dengel; Ankur R. Desai; Eugenie Euskirchen; Thomas Friborg; Daniele Gasbarra; Ignacio Goded; Mathias Goeckede; Martin Heimann; Manuel Helbig; Takashi Hirano; David Y. Hollinger; Hiroki Iwata; Minseok Kang; Janina Klatt; Ken W. Krauss; Lars Kutzbach; Annalea Lohila; Bhaskar Mitra; Timothy H. Morin; Mats B. Nilsson; Shuli Niu; Asko Noormets; Walter C. Oechel; Matthias Peichl; Olli Peltola; Michele L. Reba; Andrew D. Richardson; Benjamin R; K. Runkle; Youngryel Ryu; Torsten Sachs; Karina V; R. Schäfer; Hans Peter Schmid; Narasinha Shurpali; Oliver Sonnentag; Angela C. I. Tang; Masahito Ueyama; Rodrigo Vargas; Timo Vesala; Eric J. Ward; Lisamarie Windham-Myers; Georg Wohlfahrt; Donatella Zona
  Bulletin of the American Meteorological Society, 100, 12, 2607, 2632, 2019, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Ecosystem‐scale methane flux in tropical peat swamp forest in Indonesia
  Ayaka Sakabe; Masayuki Itoh; Takashi Hirano; Kitso Kusin
  Global Change Biology, 24, 11, 5123, 5136, Wiley, 02 Sep. 2018
  AbstractData on ecosystem‐scale methane (CH4) fluxes in tropical peatlands are currently lacking in the globalCH4budget. Although the waterlogged Indonesian peatlands contain the largest share of peat carbon in South‐East Asia, ecosystem‐scaleCH4budgets have not yet been reported, although these peatlands have the potential to emitCH4. We observed 1‐year variations in the ecosystem‐scaleCH4flux in an undrained secondary peat swamp forest in central Kalimantan, Indonesia, using the eddy covariance method. We found that the peat swamp forest switched from being aCH4sink during the dry season (as low as −8.9 mg C m−2 day−1) to a source ofCH4during the wet season (up to 10.7 mg C m−2 day−1), and this was dependent on changes in the groundwater level (GWL). The highGWLduring the wet season enhanced the anaerobicCH4production in the surface layer that had more labile organic matter. However, theCH4emission also increased when theGWLdropped during dry spells in the wet season. The annualCH4budget in the studied tropical peat swamp forest (0.09–0.17 g C m−2 year−1) was much lower than that in northern, temperate, and subtropical wetlands. We found thatCH4fluxes had almost no effect on the global warming gas budget of the peat swamp forest, and values were only a few percent less than theCO2fluxes at the same site. In addition, we conducted anaerobic soil incubation experiments to examine the effect of land‐use change onCH4production. The results indicated much higherCH4production potential in undrained forest soil than in drained or drained and burned ex‐forest soils. However, althoughCH4production decreased in drained soils relative to undrained soils, conserving pristine peat swamp forests with highGWLs is important to suppress global warming becauseCO2emissions increase in drained peatlands.
• Micrometeorological measurement of methane flux above a tropical peat swamp forest
  Guan Xhuan Wong; Ryuichi Hirata; Takashi Hirano; Frankie Kiew; Edward Baran Aeries; Kevin Kemudang Musin; Joseph Wenceslaus Waili; Kim San Lo; Lulie Melling
  Agricultural and Forest Meteorology, 256-257, 353, 361, Elsevier B.V., 15 Jun. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 11048446
• Soil carbon dioxide emissions due to oxidative peat decomposition in an oil palm plantation on tropical peat
  Kiwamu Ishikura; Takashi Hirano; Yosuke Okimoto; Ryuichi Hirata; Frankie Kiew; Lulie Melling; Edward Baran Aeries; Kim San Lo; Kevin Kemudang Musin; Joseph Wenceslaus Waili; Guan Xhuan Wong; Yoshiyuki Ishii
  Agriculture, Ecosystems and Environment, 254, 202, 212, Elsevier B.V., 15 Feb. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 11048446
• The surface-atmosphere exchange of carbon dioxide in tropical rainforests: Sensitivity to environmental drivers and flux measurement methodology
  Fu Z; Gerken T; Bromley G; Araújo A; Bonal D; Burban B; Ficklin D; Fuentes J; Goulden M; Hirano T; Kosugi Y; Liddell M; Nicolini G; Niu S; Roupsard O; Stefani P, Mi; C; Tofte Z; Xiao J; Valentini R; Wolf S; Stoy P
  Agricultural and Forest Meteorology, 263, 292, 307, 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 10554782
• Ecosystem-scale methane flux in tropical peat swamp forest in Indonesia
  Sakabe A; Itoh M; Hirano T; Kitso K
  Global Change Biology, 24, 11, 5123, 5136, 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, Data on ecosystem-scale methane (CH4 ) fluxes in tropical peatlands are currently lacking in the global CH4 budget. Although the waterlogged Indonesian peatlands contain the largest share of peat carbon in South-East Asia, ecosystem-scale CH4 budgets have not yet been reported, although these peatlands have the potential to emit CH4 . We observed 1-year variations in the ecosystem-scale CH4 flux in an undrained secondary peat swamp forest in central Kalimantan, Indonesia, using the eddy covariance method. We found that the peat swamp forest switched from being a CH4 sink during the dry season (as low as -8.9 mg C m-2  day-1 ) to a source of CH4 during the wet season (up to 10.7 mg C m-2  day-1 ), and this was dependent on changes in the groundwater level (GWL). The high GWL during the wet season enhanced the anaerobic CH4 production in the surface layer that had more labile organic matter. However, the CH4 emission also increased when the GWL dropped during dry spells in the wet season. The annual CH4 budget in the studied tropical peat swamp forest (0.09-0.17 g C m-2  year-1 ) was much lower than that in northern, temperate, and subtropical wetlands. We found that CH4 fluxes had almost no effect on the global warming gas budget of the peat swamp forest, and values were only a few percent less than the CO2 fluxes at the same site. In addition, we conducted anaerobic soil incubation experiments to examine the effect of land-use change on CH4 production. The results indicated much higher CH4 production potential in undrained forest soil than in drained or drained and burned ex-forest soils. However, although CH4 production decreased in drained soils relative to undrained soils, conserving pristine peat swamp forests with high GWLs is important to suppress global warming because CO2 emissions increase in drained peatlands., 11048448
• CO2 balance of a secondary tropical peat swamp forest in Sarawak, Malaysia
  Frankie Kiew; Ryuichi Hirata; Takashi Hirano; Guan Xhuan Wong; Edward Baran Aeries; Kevin Kemudang Musin; Joseph Wenceslaus Waili; Kim San Lo; Mariko Shimizu; Lulie Melling
  AGRICULTURAL AND FOREST METEOROLOGY, 248, 494, 501, Jan. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 11048448
• Factors affecting oxidative peat decomposition due to land use in tropical peat swamp forests in Indonesia
  Masayuki Itoh; Yosuke Okimoto; Takashi Hirano; Kitso Kusin
  SCIENCE OF THE TOTAL ENVIRONMENT, 609, 906, 915, Dec. 2017, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 11048448
• Effect of climate warming on the annual terrestrial net ecosystem CO2 exchange globally in the boreal and temperate regions
  Zhiyuan Zhang; Renduo Zhang; Alessandro Cescatti; Georg Wohlfahrt; Nina Buchmann; Juan Zhu; Guanhong Chen; Fernando Moyano; Jukka Pumpanen; Takashi Hirano; Kentaro Takagi; Lutz Merbold
  SCIENTIFIC REPORTS, 7, 3108, Jun. 2017, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Optimum air temperature for tropical forest photosynthesis: mechanisms involved and implications for climate warming
  Zheng-Hong Tan; Jiye Zeng; Yong-Jiang Zhang; Martijn Slot; Minoru Gamo; Takashi Hirano; Yoshiko Kosugi; Humberto R. da Rocha; Scott R. Saleska; Michael L. Goulden; Steven C. Wofsy; Scott D. Miller; Antonio O. Manzi; Antonio D. Nobre; Plinio B. de Camargo; Natalia Restrepo-Coupe
  ENVIRONMENTAL RESEARCH LETTERS, 12, 5, 054022, May 2017, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• New data-driven estimation of terrestrial CO2 fluxes in Asia using a standardized database of eddy covariance measurements, remote sensing data, and support vector regression
  Kazuhito Ichii; Masahito Ueyama; Masayuki Kondo; Nobuko Saigusa; Joon Kim; Ma. Carmelita Alberto; Jonas Ardoe; Eugenie S. Euskirchen; Minseok Kang; Takashi Hirano; Joanna Joiner; Hideki Kobayashi; Luca Belelli Marchesini; Lutz Merbold; Akira Miyata; Taku M. Saitoh; Kentaro Takagi; Andrej Varlagin; M. Syndonia Bret-Harte; Kenzo Kitamura; Yoshiko Kosugi; Ayumi Kotani; Kireet Kumar; Sheng-Gong Li; Takashi Machimura; Yojiro Matsuura; Yasuko Mizoguchi; Takeshi Ohta; Sandipan Mukherjee; Yuji Yanagi; Yukio Yasuda; Yiping Zhang; Fenghua Zhao
  JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES, 122, 4, 767, 795, Apr. 2017, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Comparison of litter-bag and chamber methods for measuring CO2 emissions from leaf litter decomposition in a temperate forest
  Lifei Sun; Munemasa Teramoto; Naishin Liang; Tomotsugu Yazaki; Takashi Hirano
  JOURNAL OF AGRICULTURAL METEOROLOGY, 73, 2, 59, 67, Apr. 2017, [Peer-reviewed], [Last author]
  English, Scientific journal
• Denial of long-term issues with agriculture on tropical peatlands will have devastating consequences
  Lahiru S. Wijedasa; Jyrki Jauhiainen; Mari Kononen; Maija Lampela; Harri Vasander; Marie-Claire Leblanc; Stephanie Evers; Thomas E. L. Smith; Catherine M. Yule; Helena Varkkey; Massimo Lupascu; Faizal Parish; Ian Singleton; Gopalasamy R. Clements; Sheema Abdul Aziz; Mark E. Harrison; Susan Cheyne; Gusti Z. Anshari; Erik Meijaard; Jenny E. Goldstein; Susan Waldron; Kristell Hergoualc'h; Rene Dommain; Steve Frolking; Christopher D. Evans; Mary Rose C. Posa; Paul H. Glaser; Nyoman Suryadiputra; Reza Lubis; Truly Santika; Rory Padfield; Sofyan Kurnianto; Panut Hadisiswoyo; Teck Wyn Lim; Susan E. Page; Vincent Gauci; Peter J. Van der Meer; Helen Buckland; Fabien Garnier; Marshall K. Samuel; Liza Nuriati Lim Kim Choo; Patrick O'Reilly; Matthew Warren; Surin Suksuwan; Elham Sumarga; Anuj Jain; William F. Laurance; John Couwenberg; Hans Joosten; Ronald Vernimmen; Aljosja Hooijer; Chris Malins; Mark A. Cochrane; Balu Perumal; Florian Siegert; Kelvin S. -H. Peh; Louis-Pierre Comeau; Louis Verchot; Charles F. Harvey; Alex Cobb; Zeehan Jaafar; Henk Wosten; Solichin Manuri; Moritz Muller; Wim Giesen; Jacob Phelps; Ding Li Yong; Marcel Silvius; Beatrice M. M. Wedeux; Alison Hoyt; Mitsuru Osaki; Takashi Hirano; Hidenori Takahashi; Takashi S. Kohyama; Akira Haraguchi; Nunung P. Nugroho; David A. Coomes; Le Phat Quoi; Alue Dohong; Haris Gunawan; David L. A. Gaveau; Andreas Langner; Felix K. S. Lim; David P. Edwards; Xingli Giam; Guido Van der Werf; Rachel Carmenta; Caspar C. Verwer; Luke Gibson; Laure Gandois; Laura Linda Bozena Graham; Jhanson Regalino; Serge A. Wich; Jack Rieley; Nicholas Kettridge; Chloe Brown; Romain Pirard; Sam Moore; B. Ripoll Capilla; Uwe Ballhorn; Hua Chew Ho; Agata Hoscilo; Sandra Lohberger; Theodore A. Evans; Nina Yulianti; Grace Blackham; Onrizal; Simon Husson; Daniel Murdiyarso; Sunita Pangala; Lydia E. S. Cole; Luca Tacconi; Hendrik Segah; Prayoto Tonoto; Janice S. H. Lee; Gerald Schmilewski; Stephan Wulffraat; Erianto Indra Putra; Megan E. Cattau; R. S. Clymo; Ross Morrison; Aazani Mujahid; Jukka Miettinen; Soo Chin Liew; Samu Valpola; David Wilson; Laura D'Arcy; Michiel Gerding; Siti Sundari; Sara A. Thornton; Barbara Kalisz; Stephen J. Chapman; Ahmad Suhaizi Mat Su; Imam Basuki; Masayuki Itoh; Carl Traeholt; Sean Sloan; Alexander K. Sayok; Roxane Andersen
  GLOBAL CHANGE BIOLOGY, 23, 3, 977, 982, Mar. 2017, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Soil carbon dioxide emissions from a rubber plantation on tropical peat
  Nur Wakhid; Takashi Hirano; Yosuke Okimoto; Siti Nurzakiah; Dedi Nursyamsi
  SCIENCE OF THE TOTAL ENVIRONMENT, 581, 857, 865, Mar. 2017, [Peer-reviewed], [Corresponding author], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 10554782
• Energy balance and evapotranspiration changes in a larch forest caused by severe disturbance during an early secondary succession
  Takashi Hirano; Keiji Suzuki; Ryuichi Hirata
  AGRICULTURAL AND FOREST METEOROLOGY, 232, 457, 468, Jan. 2017, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
  English, Scientific journal, 10554784
• Biomass Accumulation and Net Primary Production during the Early Stage of Secondary Succession after a Severe Forest Disturbance in Northern Japan
  Tomotsugu Yazaki; Takashi Hirano; Tomohito Sano
  FORESTS, 7, 11, doi:10.3390/f7110287, Nov. 2016, [Peer-reviewed], [International Magazine]
  English, Scientific journal, 10554784
• ハイパースペクトル画像による植生情報の時空間変動解析
  吉川慶; 矢崎友嗣; 井手玲子; 栗原純一; 小熊宏之; 平野高司
  北海道の農業気象, 68, 68, 11, 20, Oct. 2016, [Peer-reviewed], [Last author, Corresponding author]
  Japanese, Scientific journal, 10554784
• Effects of the expansion of vascular plants in Sphagnum-dominated bog on evapotranspiration
  Takashi Hirano; Hiroyuki Yamada; Masayuki Takada; Yoshiyasu Fujimura; Hiroko Fujita; Hidenori Takahashi
  AGRICULTURAL AND FOREST METEOROLOGY, 220, 90, 100, Apr. 2016, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
  English, Scientific journal, 10180058
• How hydrology determines seasonal and interannual variations in water table depth, surface energy exchange, and water stress in a tropical peatland: Modeling versus measurements
  M. Mezbahuddin; R. F. Grant; T. Hirano
  JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES, 120, 11, 2132, 2157, Nov. 2015, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 10554782
• Evapotranspiration of tropical peat swamp forests
  Takashi Hirano; Kitso Kusin; Suwido Limin; Mitsuru Osaki
  GLOBAL CHANGE BIOLOGY, 21, 5, 1914, 1927, May 2015, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 10554782
• Regional forest biomass estimation using ICESat/GLAS spaceborne LiDAR over Borneo
  Masato Hayashi; Nobuko Saigusa; Yoshiki Yamagata; Takashi Hirano
  CARBON MANAGEMENT, 6, 1-2, 19, 33, Mar. 2015, [Peer-reviewed]
  English, Scientific journal
• CO2 balance of tropical peat ecosystems
  Takashi Hirano; Siti Sundari; Hiroyuki Yamada
  Tropical Peatland Ecosystems, 329, 337, Springer Japan, 01 Jan. 2015, [Peer-reviewed], [Lead author, Corresponding author]
  English, In book
• Spatial and seasonal variations of CO2 flux and photosynthetic and respiratory parameters of larch forests in East Asia
  Kentaro Takagi; Ryuichi Hirata; Reiko Ide; Masahito Ueyama; Kazuhito Ichii; Nobuko Saigusa; Takashi Hirano; Jun Asanuma; Sheng-Gong Li; Takashi Machimura; Yuichiro Nakai; Takeshi Ohta; Yoshiyuki Takahashi
  SOIL SCIENCE AND PLANT NUTRITION, 61, 1, 61, 75, Jan. 2015, [Peer-reviewed]
  English, Scientific journal
• Components of near-surface energy balance derived from satellite soundings - Part 1: Noontime net available energy
  K. Mallick; A. Jarvis; G. Wohlfahrt; G. Kiely; T. Hirano; A. Miyata; S. Yamamoto; L. Hoffmann
  BIOGEOSCIENCES, 12, 2, 433, 451, 2015, [Peer-reviewed]
  English, Scientific journal
• Environmental dependence and seasonal variation of diffuse solar radiation in tropical peatland
  Fiolenta Marpaung; Takashi Hirano
  JOURNAL OF AGRICULTURAL METEOROLOGY, 70, 4, 223, 232, Dec. 2014, [Peer-reviewed], [Last author]
  English, Scientific journal
• Response of surface air temperature to small-scale land clearing across latitudes
  Mi Zhang; Xuhui Lee; Guirui Yu; Shijie Han; Huimin Wang; Junhua Yan; Yiping Zhang; Yide Li; Takeshi Ohta; Takashi Hirano; Joon Kim; Natsuko Yoshifuji; Wei Wang
  ENVIRONMENTAL RESEARCH LETTERS, 9, 3, doi.10.1088/1748-9326/9/303400, Mar. 2014, [Peer-reviewed]
  English, Scientific journal
• Comparison of Gross Primary Productivity Derived from GIMMS NDVI3g, GIMMS, and MODIS in Southeast Asia
  Junbang Wang; Jingwei Dong; Jiyuan Liu; Mei Huang; Guicai Li; Steven W. Running; W. Kolby Smith; Warwick Harris; Nobuko Saigusa; Hiroaki Kondo; Yunfen Liu; Takashi Hirano; Xiangming Xiao
  REMOTE SENSING, 6, 3, 2108, 2133, Mar. 2014, [Peer-reviewed]
  English, Scientific journal
• Is the empirical coefficient b for the relaxed eddy accumulation method constant?
  Ayaka Sakabe; Masahito Ueyama; Yoshiko Kosugi; Ken Hamotani; Takashi Hirano; Ryuichi Hirata
  JOURNAL OF ATMOSPHERIC CHEMISTRY, 71, 1, 79, 94, Mar. 2014, [Peer-reviewed]
  English, Scientific journal
• Carbon dioxide emissions through oxidative peat decomposition on a burnt tropical peatland
  Takashi Hirano; Kitso Kusin; Suwido Limin; Mitsuru Osaki
  GLOBAL CHANGE BIOLOGY, 20, 2, 555, 565, Feb. 2014, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Modelling effects of seasonal variation in water table depth on net ecosystem CO2 exchange of a tropical peatland
  M. Mezbahuddin; R. F. Grant; T. Hirano
  BIOGEOSCIENCES, 11, 3, 577, 599, 2014, [Peer-reviewed], [Last author]
  English, Scientific journal
• Components of near-surface energy balance derived from satellite soundings - Part 2: Noontime latent heat flux
  K. Mallick; A. Jarvis; G. Wohlfahrt; G. Kiely; T. Hirano; A. Miyata; S. Yamamoto; L. Hoffmann
  BIOGEOSCIENCES, 11, 24, 7369, 7382, 2014, [Peer-reviewed]
  English, Scientific journal
• The impact of climate variation and disturbances on the carbon balance of forests in Hokkaido, Japan
  R. Hirata; K. Takagi; A. Ito; T. Hirano; N. Saigusa
  BIOGEOSCIENCES, 11, 18, 5139, 5154, 2014, [Peer-reviewed]
  English, Scientific journal
• Temperature and precipitation control of the spatial variation of terrestrial ecosystem carbon exchange in the Asian region
  Zhi Chen; Guirui Yu; Jianping Ge; Xiaomin Sun; Takashi Hirano; Nobuko Saigusa; Qiufeng Wang; Xianjin Zhu; Yiping Zhang; Junhui Zhang; Junhua Yan; Huimin Wang; Liang Zhao; Yanfen Wang; Peili Shi; Fenghua Zhao
  AGRICULTURAL AND FOREST METEOROLOGY, 182, 266, 276, Dec. 2013, [Peer-reviewed]
  English, Scientific journal
• カラマツ林の蒸発散とエネルギー収支
  鈴木啓司; 平田竜一; 平野高司
  北海道の農業気象, 65, 32, 41, Oct. 2013, [Peer-reviewed], [Last author, Corresponding author]
  Japanese, Scientific journal
• 植生遷移が進む森林跡地のCO2フラックスに与える環境要因の影響
  東健太; 平野高司; 寺本宗正; 梁乃申
  北海道の農業気象, 65, 23, 31, Oct. 2013, [Peer-reviewed], [Corresponding author]
  Japanese, Scientific journal
• Carbon uptake and water productivity for dry-seeded rice and hybrid maize grown with overhead sprinkler irrigation
  Ma Carmelita R. Alberto; Roland J. Buresh; Takashi Hirano; Akira Miyata; Reiner Wassmann; James R. Quilty; Teodoro Q. Correa; Joseph Sandro
  FIELD CROPS RESEARCH, 146, 51, 65, May 2013, [Peer-reviewed]
  English, Scientific journal
• Dataset of CarboEastAsia and uncertainties in the CO2 budget evaluation caused by different data processing
  Nobuko Saigusa; Sheng-Gong Li; Hyojung Kwon; Kentaro Takagi; Lei-Ming Zhang; Reiko Ide; Masahito Ueyama; Jun Asanuma; Young-Jean Choi; Jung Hwa Chun; Shi-Jie Han; Takashi Hirano; Ryuichi Hirata; Minseok Kang; Tomomichi Kato; Joon Kim; Ying-Nian Li; Takahisa Maeda; Akira Miyata; Yasuko Mizoguchi; Shohei Murayama; Yuichiro Nakai; Takeshi Ohta; Taku M. Saitoh; Hui-Ming Wang; Gui-Rui Yu; Yi-Ping Zhang; Feng-Hua Zhao
  JOURNAL OF FOREST RESEARCH, 18, 1, 41, 48, Feb. 2013, [Peer-reviewed]
  English, Scientific journal
• Site-level model-data synthesis of terrestrial carbon fluxes in the CarboEastAsia eddy-covariance observation network: toward future modeling efforts
  Kazuhito Ichii; Masayuki Kondo; Young-Hee Lee; Shao-Qiang Wang; Joon Kim; Masahito Ueyama; Hee-Jeong Lim; Hao Shi; Takashi Suzuki; Akihiko Ito; Hyojung Kwon; Weimin Ju; Mei Huang; Takahiro Sasai; Jun Asanuma; Shijie Han; Takashi Hirano; Ryuichi Hirata; Tomomichi Kato; Sheng-Gong Li; Ying-Nian Li; Takahisa Maeda; Akira Miyata; Yojiro Matsuura; Shohei Murayama; Yuichiro Nakai; Takeshi Ohta; Taku M. Saitoh; Nobuko Saigusa; Kentaro Takagi; Yan-Hong Tang; Hui-Min Wang; Gui-Rui Yu; Yi-Ping Zhang; Feng-Hua Zhao
  JOURNAL OF FOREST RESEARCH, 18, 1, 13, 20, Feb. 2013, [Peer-reviewed]
  English, Scientific journal
• Comparison of terrestrial evapotranspiration estimates using the mass transfer and Penman-Monteith equations in land surface models
  Jing Chen; Baozhang Chen; T. Andrew Black; John L. Innes; Guangyu Wang; Gerard Kiely; Takashi Hirano; Georg Wohlfahrt
  Journal of Geophysical Research: Biogeosciences, 118, 4, 1715, 1731, Blackwell Publishing Ltd, 2013, [Peer-reviewed]
  English, Scientific journal
• Effects of disturbances on the carbon balance of tropical peat swamp forests
  Takashi Hirano; Hendrik Segah; Kitso Kusin; Suwido Limin; Hidenori Takahashi; Mitsuru Osaki
  GLOBAL CHANGE BIOLOGY, 18, 11, 3410, 3422, Nov. 2012, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Performance of optical indirect methods to assess the change in leaf area index of a larch plantation through thinning
  Tomohito Sano; Takashi Hirano; Tomomi Takeda; Yasumi Fujinuma
  Journal of Agricultural Meteorology, 68, 1, 35, 43, 01 Sep. 2012, [Peer-reviewed]
  English, Scientific journal
• Effect Of Groundwater Level On Soil Respiration In Tropical Peat Swamp Forests
  Siti Sundari; Takashi Hirano; Hiroyuki Yamada; Kitso Kusin; Suwido Limin
  Journal of Agricultural Meteorology, 68, 2, 121, 134, 01 Sep. 2012, [Peer-reviewed], [Corresponding author]
  English, Scientific journal
• Influence of climate variability on seasonal and interannual variations of ecosystem CO2 exchange in flooded and non-flooded rice fields in the Philippines
  Ma Carmelita R. Alberto; Takashi Hirano; Akira Miyata; Reiner Wassmann; Arvind Kumar; Agnes Padre; Modesto Amante
  FIELD CROPS RESEARCH, 134, 80, 94, Aug. 2012, [Peer-reviewed]
  English, Scientific journal
• Thermal optimality of net ecosystem exchange of carbon dioxide and underlying mechanisms
  Shuli Niu; Yiqi Luo; Shenfeng Fei; Wenping Yuan; David Schimel; Beverly E. Law; Christof Ammann; M. Altaf Arain; Almut Arneth; Marc Aubinet; Alan Barr; Jason Beringer; Christian Bernhofer; T. Andrew Black; Nina Buchmann; Alessandro Cescatti; Jiquan Chen; Kenneth J. Davis; Ebba Dellwik; Ankur R. Desai; Sophia Etzold; Louis Francois; Damiano Gianelle; Bert Gielen; Allen Goldstein; Margriet Groenendijk; Lianhong Gu; Niall Hanan; Carole Helfter; Takashi Hirano; David Y. Hollinger; Mike B. Jones; Gerard Kiely; Thomas E. Kolb; Werner L. Kutsch; Peter Lafleur; David M. Lawrence; Linghao Li; Anders Lindroth; Marcy Litvak; Denis Loustau; Magnus Lund; Michal Marek; Timothy A. Martin; Giorgio Matteucci; Mirco Migliavacca; Leonardo Montagnani; Eddy Moors; J. William Munger; Asko Noormets; Walter Oechel; Janusz Olejnik; Kyaw Tha Paw U; Kim Pilegaard; Serge Rambal; Antonio Raschi; Russell L. Scott; Guenther Seufert; Donatella Spano; Paul Stoy; Mark A. Sutton; Andrej Varlagin; Timo Vesala; Ensheng Weng; Georg Wohlfahrt; Bai Yang; Zhongda Zhang; Xuhui Zhou
  NEW PHYTOLOGIST, 194, 3, 775, 783, May 2012, [Peer-reviewed]
  English, Scientific journal
• Influences of various calculation options on heat, water and carbon fluxes determined by open- and closed-path eddy covariance methods
  Masahito Ueyama; Ryuichi Hirata; Masayoshi Mano; Ken Hamotani; Yoshinobu Harazono; Takashi Hirano; Akira Miyata; Kentaro Takagi; Yoshiyuki Takahashi
  TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY, 64, http://dx.doi.org/10.3402/tell, 2012, [Peer-reviewed]
  English, Scientific journal
• Geographical assessment of factors for Sasa expansion in the Sarobetsu Mire, Japan
  Takada M; Inoue T; Mishima Y; Fujita H; Hirano T; Fujimura Y
  Journal of Landscape Ecology, 5, 58, 71, 2012, [Peer-reviewed]
  English, Scientific journal
• Effects of irrigation on the hydrological and chemical budgets of lake Miyajima-numa in the Ishikari Peatland, northern Japan
  Toshikazu Kizuka; Hiroyuki Yamada; Takashi Hirano
  Ecology and Civil Engineering, 15, 1, 45, 59, Ecology and Civil Engineering Society, 2012, [Peer-reviewed], [Last author]
  Japanese, Scientific journal
• Effect of drought stress on isoprene emission from two major Quercus species native to East Asia
  Akira Tani; Daisuke Tozaki; Motonori Okumura; Susumu Nozoe; Takashi Hirano
  ATMOSPHERIC ENVIRONMENT, 45, 34, 6261, 6266, Nov. 2011, [Peer-reviewed]
  English, Scientific journal
• Comparisons of energy balance and evapotranspiration between flooded and aerobic rice fields in the Philippines
  Ma Carmelita R. Alberto; Reiner Wassmann; Takashi Hirano; Akira Miyata; Ryusuke Hatano; Arvind Kumar; Agnes Padre; Modesto Amante
  AGRICULTURAL WATER MANAGEMENT, 98, 9, 1417, 1430, Jul. 2011, [Peer-reviewed]
  English, Scientific journal
• Hydrological and chemical budgets of a mire pool formed on alluvial lowland of Hokkaido, northern Japan
  Toshikazu Kizuka; Hiroyuki Yamada; Takashi Hirano
  JOURNAL OF HYDROLOGY, 401, 1-2, 106, 116, Apr. 2011, [Peer-reviewed], [Last author]
  English, Scientific journal
• Spatial variations in evapotranspiration over East Asian forest sites. II. Surface conductance and aerodynamic conductance
  Khatun R; Ohta T; Kotani A; Asanuma J; Gamo M; Han S; Hirano T; Nakai Y; Saigusa N; Takagi K; Wang H; Yoshifuji N
  Hydrological Research Letters, 5, 88, 92, THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2011, [Peer-reviewed]
  English, Scientific journal, Evapotranspiration over forest surfaces is mainly constrained by environmental and forest structural components through their influence on surface conductance (G_s) and aerodynamic conductance (G_a). Tower based eddy covariance data from 16 forest sites in East Asia (2°S to 64°N) were used to examine the sensitivity of Matsumoto and Nakai models for predicting G_s and G_a, respectively. Daytime dry-canopy data for the growing season were used in this study. Comparisons between model predictions and observed G_s and G_a showed good agreement, suggesting that the models were suitable for predicting G_s and G_a with reasonable accuracy. However, the model for G_s was unable to predict G_s accurately when soil water content was low (∼10%). In this circumstance, effective soil water content and a more comprehensive method for modelling the soil water content function must be used. G_s in East Asia was largely depended on vapour pressure deficit and secondarily on soil water content. G_a was largely affected by leaf area index compared with stand density.
  
• Spatial variations in evapotranspiration over East Asian forest sites. I. Evapotranspiration and decoupling coefficien
  Khatun R; Ohta T; Kotani A; Asanuma J; Gamo M; Han S; Hirano T; Nakai Y; Saigusa N; Takagi K; Wang H; Yoshifuji N
  Hydrological Research Letters, 5, 83, 87, THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2011, [Peer-reviewed]
  English, Scientific journal, Evapotranspiration (ET) is not only a vital component of water budget, but also plays an important role in the energy budget of the earth-atmospheric system, ultimately driving many regional and global scale climatological processes. This paper describes the ET characteristics and factors controlling ET across the 17 forest sites in East Asia (2°S to 64°N latitude). ET was measured using the eddy covariance technique at each site. Daytime dry-canopy data for the growing season were used in this study. Growing season mean ET gradually decreased as latitude increased, with a range of 4.4 to 1.2 mm d⁻¹. The growing season mean decoupling coefficient (Ω) ranged from 0.42 to 0.11 across the studied sites. At low-latitude forest sites, Ω was close to 0.50, indicating that the bulk surface was partially decoupled from the atmosphere and ET was strongly controlled by net radiation and vapour pressure deficit. At high-latitude forest sites, Ω was low (∼0.12), indicating that the bulk surface was well coupled to the atmosphere and ET was mainly controlled by surface conductance. The value of Ω was determined mainly by the ratio of aerodynamic conductance to surface conductance across the studied forests of East Asia.
  
• Carbon dioxide exchange of a larch forest after a typhoon disturbance
  Tomohito Sano; Takashi Hirano; Naishen Liang; Ryuichi Hirata; Yasumi Fujinuma
  FOREST ECOLOGY AND MANAGEMENT, 260, 12, 2214, 2223, Dec. 2010, [Peer-reviewed]
  English, Scientific journal
• Looking deeper into the soil: biophysical controls and seasonal lags of soil CO2 production and efflux
  Rodrigo Vargas; Dennis D. Baldocchi; Michael F. Allen; Michael Bahn; T. Andrew Black; Scott L. Collins; Jorge Curiel Yuste; Takashi Hirano; Rachhpal S. Jassal; Jukka Pumpanen; Jianwu Tang
  ECOLOGICAL APPLICATIONS, 20, 6, 1569, 1582, Sep. 2010, [Peer-reviewed]
  English, Scientific journal
• Simulating carbon and water cycles of larch forests in East Asia by the BIOME-BGC model with AsiaFlux data
  Ueyama M.; Ichii K.; Hirata R.; Takagi K.; Asanuma J.; Machimura T.; Nakai Y.; Ohta T.; Saigusa N.; Takahashi Y.; Hirano T.
  Biogeosciences, 7, 3, 959, 977, Copernicus Publications, 10 Mar. 2010, [Peer-reviewed]
  English, Larch forests are widely distributed across many cool-temperate and boreal regions, and they are expected to play an important role in global carbon and water cycles. Model parameterizations for larch forests still contain large uncertainties owing to a lack of validation. In this study, a process-based terrestrial biosphere model, BIOME-BGC, was tested for larch forests at six AsiaFlux sites and used to identify important environmental factors that affect the carbon and water cycles at both temporal and spatial scales. The model simulation performed with the default deciduous conifer parameters produced results that had large differences from the observed net ecosystem exchange (NEE), gross primary productivity (GPP), ecosystem respiration (RE), and evapotranspiration (ET). Therefore, we adjusted several model parameters in order to reproduce the observed rates of carbon and water cycle processes. This model calibration, performed using the AsiaFlux data, substantially improved the model performance. The simulated annual GPP, RE, NEE, and ET from the calibrated model were highly consistent with observed values. The observed and simulated GPP and RE across the six sites were positively correlated with the annual mean air temperature and annual total precipitation. On the other hand, the simulated carbon budget was partly explained by the stand disturbance history in addition to the climate. The sensitivity study indicated that spring warming enhanced the carbon sink, whereas summer warming decreased it across the larch forests. The summer radiation was the most important factor that controlled the carbon fluxes in the temperate site, but the VPD and water conditions were the limiting factors in the boreal sites. One model parameter, the allocation ratio of carbon between belowground and aboveground, was site-specific, and it was negatively correlated with the annual climate of annual mean air temperature and total precipitation. Although this study substantially improved the model performance, the uncertainties that remained in terms of the sensitivity to water conditions should be examined in ongoing and long-term observations.
• Detection of fire impact and vegetation recovery over tropical peat swamp forest by satellite data and ground-based NDVI instrument
  Hendrik Segah; Hiroshi Tani; Takashi Hirano
  INTERNATIONAL JOURNAL OF REMOTE SENSING, 31, 20, 5297, 5314, 2010, [Peer-reviewed], [Last author]
  English, Scientific journal
• Soil CO2 efflux of a larch forest in northern Japan
  N. Liang; T. Hirano; Z. -M. Zheng; J. Tang; Y. Fujinuma
  BIOGEOSCIENCES, 7, 11, 3447, 3457, 2010, [Peer-reviewed]
  English, Scientific journal
• The land-atmosphere water flux in the tropics
  Joshua B. Fisher; Yadvinder Malhi; Damien Bonal; Humberto R. Da Rocha; Alessandro C. De Araujo; Minoru Gamo; Michael L. Goulden; Takashi Hirano; Alfredo R. Huete; Hiroaki Kondo; Tomo'Omi Kumagai; Henry W. Loescher; Scott Miller; Antonio D. Nobre; Yann Nouvellon; Steven F. Oberbauer; Samreong Panuthai; Olivier Roupsard; Scott Saleska; Katsunori Tanaka; Nobuaki Tanaka; Kevin P. Tu; Celso Von Randow
  GLOBAL CHANGE BIOLOGY, 15, 11, 2694, 2714, Nov. 2009, [Peer-reviewed]
  English, Scientific journal
• CO2/heat fluxes in rice fields: Comparative assessment of flooded and non-flooded fields in the Philippines
  Ma. Carmelita R. Alberto; Reiner Wassmann; Takashi Hirano; Akira Miyata; Arvind Kumar; Agnes Padre; Modesto Amante
  AGRICULTURAL AND FOREST METEOROLOGY, 149, 10, 1737, 1750, Oct. 2009, [Peer-reviewed]
  English, Scientific journal
• Controls on the Carbon Balance of Tropical Peatlands
  Takashi Hirano; Jyrki Jauhiainen; Takashi Inoue; Hidenori Takahashi
  ECOSYSTEMS, 12, 6, 873, 887, Sep. 2009, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Temporal and spatial variations in the seasonal patterns of CO2 flux in boreal, temperate, and tropical forests in East Asia
  Nobuko Saigusa; Susumu Yamamoto; Ryuichi Hirata; Yoshikazu Ohtani; Reiko Ide; Jun Asanuma; Minoru Gamo; Takashi Hirano; Hiroaki Kondo; Yoshiko Kosugi; Sheng-Gong Li; Yuichiro Nakai; Kentaro Takagi; Makoto Tani; Huimin Wang
  AGRICULTURAL AND FOREST METEOROLOGY, 148, 5, 700, 713, May 2008, [Peer-reviewed]
  English, Scientific journal
• Spatial distribution of carbon balance in forest ecosystems across East Asia
  Ryuichi Hirata; Nobuko Saigusa; Susumu Yamamoto; Yoshikazu Ohtani; Reiko Ide; Jun Asanuma; Minoru Gamo; Takashi Hirano; Hiroaki Kondo; Yoshiko Kosugi; Sheng-Gong Li; Yuichiro Nakai; Kentaro Takagi; Makoto Tani; Huimin Wang
  AGRICULTURAL AND FOREST METEOROLOGY, 148, 5, 761, 775, May 2008, [Peer-reviewed]
  English, Scientific journal
• Hydrochemistry of Miyajimanuma pool in the Ishikari Peatland, nothern Japan
  木塚俊和; 山田浩之; 平野高司
  Papers on environmental information science, 22, 22, 493, 498, 環境情報科学センター, 2008, [Peer-reviewed], [Last author]
  Japanese
• Seasonal and interannual variations in carbon dioxide exchange of a temperate larch forest
  Ryuichi Hirata; Takashi Hirano; Nobuko Saigusa; Yasumi Fujinuma; Koh Inukai; Yasuyuki Kitamori; Yoshiyuki Takahashi; Susumu Yamamoto
  AGRICULTURAL AND FOREST METEOROLOGY, 147, 3-4, 110, 124, Dec. 2007, [Peer-reviewed]
  English, Scientific journal
• Nighttime transpiration observed over a larch forest in Hokkaido, Japan
  N. Kobayashi; T. Hiyama; Y. Fukushima; M. L. Lopez; T. Hirano; Y. Fujinuma
  WATER RESOURCES RESEARCH, 43, 3, W03407, doi:10.1029/2006WR005556, Mar. 2007, [Peer-reviewed]
  English, Scientific journal
• Carbon dioxide balance of a tropical peat swamp forest in Kalimantan, Indonesia
  Takashi Hirano; Hendrik Segah; Tsuyoshi Harada; Suwido Limin; Tania June; Ryuichi Hirata; Mitsuru Osaki
  GLOBAL CHANGE BIOLOGY, 13, 2, 412, 425, Feb. 2007, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Comparisons of gap-filling methods for carbon flux dataset: A combination of a genetic algorithm and an artificial neural network
  Makoto Ooba; Takashi Hirano; Jun-Ichi Mogami; Ryuichi Hirata; Yasumi Fujinuma
  ECOLOGICAL MODELLING, 198, 3-4, 473, 486, Oct. 2006, [Peer-reviewed]
  English, Scientific journal
• Carbon dioxide exchange of larch (Larix gmelinii) cones during development
  Wenjie Wang; Yuangang Zu; Song Cui; Takashi Hirano; Yoko Watanabe; Takayoshi Koike
  TREE PHYSIOLOGY, 26, 10, 1363, 1368, Oct. 2006, [Peer-reviewed]
  English, Scientific journal
• Diurnal variations and vertical gradients of biogenic volatile and semi-volatile organic compounds at the Tomakomai larch forest station in Japan
  Teruyo Ieda; Yasuyuki Kitamori; Michihiro Mochida; Ryuichi Hirata; Takashi Hirano; Kou Inukai; Yasumi Fujinuma; Kimitaka Kawamura
  TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY, 58, 3, 177, 186, Jul. 2006, [Peer-reviewed]
  English, Scientific journal
• A study on CO₂ dynamics within formation / deformation of inversion layer in mountain basin.
  Nakane Midori; Okada Keiji; Kodama Yuji; Hirano Takashi; Sasaka Yukari; Kohoge Tsubasa
  Proceedings of annual meeting of the Society of Agricultural Meteorology of Japan, 2006sp, 51, 51, The Society of Agricultural Meteorology of Japan, 2006
• Effect of spatial variation of soil respiration rates following disturbance by timber harvesting in a larch plantation in northern Japan
  Oxana V. Masyagina; Takashi Hirano; Dong Hun Ji; Dong Su Choi; Laiye Qu; Yasumi Fujinuma; Kaichiro Sasa; Yojiro Matsuura; Stanislav G. Prokushkin; Takayoshi Koike
  Forest Science and Technology, 2, 2, 80, 91, 2006, [Peer-reviewed]
  English, Scientific journal
• Newly-formed photosynthates and the respiration rate of girdled stems of Korean pine (Pinus koraiensis Sieb. et Zucc.)
  WJ Wang; YG Zu; HM Wang; XY Li; T Hirano; T Koike
  PHOTOSYNTHETICA, 44, 1, 147, 150, 2006, [Peer-reviewed]
  English, Scientific journal
• Changes in CO2 exchanges during the development of larch (Larix gmelinii) cones
  Wang W; Zu Y; Cui S; Hirano T; Watanabe Y; Koike T
  Tree Physiology, 26, 1363, 1368, 2006, [Peer-reviewed]
  English, Scientific journal
• Seasonal and diurnal variations in topsoil and subsoil respiration under snowpack in a temperate deciduous forest
  T Hirano
  GLOBAL BIOGEOCHEMICAL CYCLES, 19, 2, GB2011, doi:10.1029/2004GB002259, Apr. 2005, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Effect of collar insertion on soil respiration in a larch forest measured with a LI-6400 soil CO2 flux system
  WJ Wang; YG Zu; HM Wang; T Hirano; K Takagi; K Sasa; T Koike
  JOURNAL OF FOREST RESEARCH, 10, 1, 57, 60, Feb. 2005, [Peer-reviewed]
  English, Scientific journal
• Findings through AsiaFlux network and view toward the future
  Yamamoto S; Saigusa N; Gamo M; Fujinuma Y; Inoue G; Hirano T
  Journal of Geographical Sciences, 15, 2, 142, 148, 2005, [Peer-reviewed], [Last author]
  English, Scientific journal
• 生物複雑系に適応するモデルとその背景
  大場 真; 平野高司
  北海道の農業気象, 57, 49, 63, 2005, [Peer-reviewed], [Last author]
  Japanese, Scientific journal
• CO2 exchange of a Sphagnum fuscum community in Interior Alaska.
  Hirano T; Urano S; Yazaki T; Yabe K; Kawauchi K; Okada K; Hinzman L; Ishikawa N
  Journal of Agricultural Meteorology, 60, 5, 737, 740, 日本農業気象学会, 2005, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Effects of wind speed and direction on eddy fluxes over a larch plantation.
  Hirata R; Hirano T; Okada K; Fujinuma Y; Inukai K; Saigusa N; Yamamoto S
  Journal of Agricultural Meteorology, 60, 5, 741, 744, 日本農業気象学会, 2005, [Peer-reviewed]
  English, Scientific journal
• Change of carbon dioxide budget during three years after deforestation in eastern Siberia larch forest.
  Machimura T; Kobayashi Y; Iwahana G; Hirano T; Lopez L; Fukuda M; Fedorov A
  Journal of Agricultural Meteorology, 60, 5, 653, 656, 日本農業気象学会, 2005, [Peer-reviewed]
  English, Scientific journal
• Contribution of litter CO2 production to total soil respiration in two different deciduous forests
  H. Kim; T. Hirano; T. Koike; S. Urano
  PHYTON-ANNALES REI BOTANICAE, 45, 4, 385, 388, 2005, [Peer-reviewed]
  English, Scientific journal
• Variation in photosynthetic photon flux density on a larch forest floor
  Mogami J; Hirano T; Hirata R; Kitaoka S; Koike T; Fujinuma Y
  Journal of Agricultural Meteorology, 60, 6, 1161, 1163, 日本農業気象学会, 2005, [Peer-reviewed]
  English, Scientific journal
• Characteristics of heat balance in a building for farm product storage using the latent heat of ice as natural cold energy
  Urano S; Okada K; Ide K; Sano T; Kimura M; Hirano T; Funakoshi H; Takenoshita Y; Dohkoshi J
  Journal of Agricultural Meteorology, 60, 5, 801, 804, 日本農業気象学会, 2005, [Peer-reviewed]
  English, Scientific journal
• Energy balance of a tropical peat swamp forest in Central Kalimantan, Indonesia
  T. Hirano; H. Segah; S. Limin; T. June; S. J. Tuah; K. Kusin; R. Hirata; M. Osaki
  PHYTON-ANNALES REI BOTANICAE, 45, 4, 67, 71, 2005, [Peer-reviewed], [Lead author]
  English, Scientific journal
• Response of CO2 flux to environmental variables in two larch forest ecosystems in East Asia
  H. Wang; N. Saigusa; Y. Zu; S. Yamamoto; H. Kondo; F. Yang; W. Wang; T. Hirano; Y. Fujinuma
  PHYTON-ANNALES REI BOTANICAE, 45, 4, 339, 346, 2005, [Peer-reviewed]
  English, Scientific journal
• Seasonal variation in CO2 production of leaf litter from different deciduous forests at the early decomposition stage
  Honghyun Kim; Takashi Hirano; Shin-Ichi Urano
  Journal of Agricultural Meteorology, 61, 2, 95, 104, 2005, [Peer-reviewed]
  English, Scientific journal
• カラマツ林におけるLAIの季節変化が林内気象に与える影響
  福田達也; 平野高司; 佐野智人; 平田竜一; 犬飼 孔; 藤沼康実
  北海道の農業気象, 57, 29, 38, 2005, [Peer-reviewed]
  Japanese, Scientific journal
• Forest fire impact monitoring in peat swamp area using satellite data: case study in Central Kalimantan, Indonesia
  Segah H; Tani H; Hirano T; Kasahara T; Limin S
  Journal of Agricultural Meteorology, 60, 5, 415, 420, Society of Agricultural Meteorology of Japan, 2005, [Peer-reviewed]
  English, Scientific journal
• CO2 flux measured by an open-path system over a larch forest during the snow-covered season
  R. Hirata; T. Hirano; J. Mogami; Y. Fujinuma; K. Inukai; N. Saigusa; S. Yamamoto
  PHYTON-ANNALES REI BOTANICAE, 45, 4, 347, 351, 2005, [Peer-reviewed]
  English, Scientific journal
• Net ecosystem CO2 exchange over a larch forest in Hokkaido, Japan
  HM Wang; N Saigusa; S Yamamoto; H Kondo; T Hirano; A Toriyama; Y Fujinuma
  ATMOSPHERIC ENVIRONMENT, 38, 40, 7021, 7032, Dec. 2004, [Peer-reviewed]
  English, Scientific journal
• In situ comparison of four approaches to estimating soil CO2 efflux in a northern larch (Larix kaempferi Sarg.) forest
  NS Liang; T Nakadai; T Hirano; LY Qu; T Koike; Y Fujinuma; G Inoue
  AGRICULTURAL AND FOREST METEOROLOGY, 123, 1-2, 97, 117, May 2004, [Peer-reviewed]
  English, Scientific journal
• Long-term half-hourly measurement of soil CO2 concentration and soil respiration in a temperate deciduous forest
  T Hirano; H Kim; Y Tanaka
  JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 108, D20, doi:10.1029/2003JD003766, Oct. 2003, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• CO2 and water vapor exchange of a larch forest in northern Japan
  T Hirano; R Hirata; Y Fujinuma; N Saigusa; S Yamamoto; Y Harazono; M Takada; K Inukai; G Inoue
  TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY, 55, 2, 244, 257, Apr. 2003, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Differences in the morphophysiological response to atmospheric humidity between paddy and upland rice
  Genichi Hirai; Tatsuya Inamura; Toshikatsu Okumura; Kaoru Ashida; Osamu Tanaka; Hiroyoshi Chujo; Takasi Hirano
  Japanese Journal of Crop Science, 72, 2, 196, 202, The Crop Science Society of Japan, 2003
  Japanese, Scientific journal
• 森林でのフラックス観測における欠測値補間法の比較
  最上純一; 平田竜一; 平野高司; 三浦昌孝; 藤沼康実; 犬飼孔
  北海道の農業気象, 55, 9, 16, 2003, [Peer-reviewed]
  Japanese, Scientific journal
• Evaluation of Sensible Heat Advection between Canopies with Different Plant Heights
  Taro Nakai; Shin-Ichi Urano; Takamitsu Sato; Takashi Hirano
  Journal of Agricultural Meteorology, 59, 2, 155, 164, 2003, [Peer-reviewed]
  English, Scientific journal
• Roles of Long-Term Flux Observations as the Global Change Study and the Current Topics
  Yoshinobu Harazono; Takashi Hirano; Nobuko Saigusa; Yoshikazu Ohtani; Akira Miyata; Eiji Ohtaki; Nobutaka Monji
  Journal of Agricultural Meteorology, 59, 1, 69, 80, 2003, [Peer-reviewed]
  English, Scientific journal
• Wang W, Osaki M, Hirano T, Hiura T and Koike T
  Wang W; Osaki M; Hirano T; Hiura T; Koike T
  Bamboo Journal, 20, 19, 32, 2003, [Peer-reviewed]
  English, Scientific journal
• Effect of Heat Storage Flux on Energy Balance in a Larch Forest
  Masataka Miura; Takashi Hirano; Ryuichi Hirata; Jun-Ichi Mogami; Koh Inukai; Yasumi Fujinuma
  Journal of Agricultural Meteorology, 59, 3, 245, 250, 2003, [Peer-reviewed]
  English, Scientific journal
• Differences in the morphophysiological response to atmospheric humidity between paddy and upland rice
  Genichi Hirai; Tatsuya Inamura; Toshikatsu Okumura; Kaoru Ashida; Osamu Tanaka; Hiroyoshi Chujo; Takasi Hirano
  Japanese Journal of Crop Science, 72, 2, 196, 202, 2003, [Peer-reviewed]
  Japanese, Scientific journal
• CO2 and Water Vapor Flux Evaluations by Modified Gradient Methods Over a Mangrove Forest
  Nobutaka Monji; Ken Hamotani; Ryuichi Tosa; Toshifumi Fukagawa; Kazutoshi Yabuki; Takashi Hirano; Vipak Jintana; Somsak Piriyayota; Akifumi Nishimiya; Masahiro Iwasaki
  Journal of Agricultural Meteorology, 58, 2, 63, 69, 01 Sep. 2002, [Peer-reviewed]
  English, Scientific journal
• Varietal differences in the morphophysiological response to atmospheric humidity in rice
  G Hirai; T Okumura; K Ashida; T Inamura; O Tanaka; H Chujo; T Hirano
  PLANT PRODUCTION SCIENCE, 5, 2, 101, 109, Jun. 2002, [Peer-reviewed], [Last author]
  English, Scientific journal
• Gas exchange and oxygen concentration in pneumatophores and prop roots of four mangrove species
  Y Kitaya; K Yabuki; M Kiyota; A Tani; T Hirano; Aiga, I
  TREES-STRUCTURE AND FUNCTION, 16, 2-3, 155, 158, Mar. 2002, [Peer-reviewed]
  English, Scientific journal
• 2001年8月，苫小牧と札幌で行われた日米フラックス比較観測
  中井裕一郎; 三枝信子; 平野高司; ロバート エバンス; 大谷義一; 平田竜一; 鳥山敦; 北村兼三; 鈴木覚; 山本晋
  水文・水資源学会誌, 15, 6, 665, 672, THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2002, [Peer-reviewed]
  Japanese, Scientific journal
• 風蓮川湿原におけるミズゴケハンモックとホローの地中熱環境
  矢崎友嗣; 浦野慎一; 矢部和夫; 河内邦夫; 高橋宣之; 隈部篤興; 犬飼孔; 平野高司
  北海道の農業気象, 54, 45, 52, 2002, [Peer-reviewed]
  Japanese, Scientific journal
• カラマツ人工林における葉面積指数および放射環境の季節変化
  平田竜一; 杉本和之; 平野高司; 小池孝良; 北岡哲; 油津雄夫; 藤田玲; 藤沼康実; 高田雅之; 犬飼孔
  北海道の農業気象, 54, 54, 53, 62, 2002, [Peer-reviewed]
  Japanese, Scientific journal
• 夏期における水稲個体群の葉温と大阪府立大学農学部附属農場の水稲収量
  平井源一; 稲野藤一郎; 簗瀬雅則; 中條博良; 平野高司; 田中修; 奥村俊勝
  近畿作物育種研究, 47, 13, 17, 2002, [Peer-reviewed]
  Japanese, Scientific journal
• Monji N, Hamotani K, Hamada Y, Agata Y, Hirano T, Yabuki K, Jintana V, Piriyayota S, Nishimiya A and Iwasaki M
  Monji N; Hamotani K; Hamada Y; Agata Y; Hirano T; Yabuki K; Jintana V; Piriyayota S; Nishimiya A; Iwasaki M
  Journal of Agricultural Meteorology, 58, 2, 71, 77, 養賢堂, 2002, [Peer-reviewed]
  English, Scientific journal, タイ南部のマングローブ林でC02と熱の交換の特性を雨季と乾季について調べた。林上のC02と熱フラックスの測定には2種類の改良傾度法(Monji et al.,2002)を用いた。1つは顕熱フラックスを渦相関法で求めて傾度との関係から拡散係数を求め、それをC02と水蒸気フラックスに適用する方法で、もう一つはこの森林の特定高度についてフラックスと傾度の関係、ここではΦm、Φh、とリチャードソン数の関係を求めておき、傾度法を適用する方法である。後者はかなり雨が激しいときに顕熱フラックスが渦相関法で求まらないときに用いた。熱フラックスについては雨季と乾季では大きな違いが見られた。雨天日には大きな上方向の潜熱フラックスがあり、これを補うように顕熱は大きく下方に運ばれていた。また、雨天日にはC02フラックスは日中でもわずかに上方向であった。全天日射量とC02フラックスの関係は雨季と乾季では大きな相違を示さなかった。 マングローブ林内の微気象を調べるために、プローブを上下させて測定を行った。林内に進入する汽水は熱環境やC02分布に影響を与えることがわかった。また、林内のCO2、は夜間に貯留され朝の日射の開始と共にそれが消費される様子が認められた。貯留の割合は風が強いときは林上のC02フラックスに比べると小さいが、弱風時には10％を超え、無視できない量であることがわかった。
• A Geometric Model of Sunflower Plants Using L-system
  Tomomi Takeda; Takashi Hirano; Shin-Ichi Urano; Ikuo Horiguchi
  Journal of Agricultural Meteorology, 57, 3, 145, 153, 01 Sep. 2001, [Peer-reviewed]
  English, Scientific journal
• Short Term Effect of CO_2 Concentration on Gaseous Air Pollutants Sorption Rates of Nerium indicum and Chamaecyparis obtusa
  SHIGEHISA Shinji; HIRANO Takashi; KIYOTA Makoto
  Papers on environmental information science, 14, 249, 254, 環境情報科学センター, 2000, [Peer-reviewed]
  Japanese, Scientific journal
• Growth reduction of the Japanese black pine corresponding to an air pollution episode
  T Hirano; K Morimoto
  ENVIRONMENTAL POLLUTION, 106, 1, 5, 12, 1999, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• The effects of time and intensity of supplemental blue lighting during morning twilight on growth and physiological performance of cucumber seedlings
  Sung I; Kiyota M; Hirano T
  Life Support & Biosphere Science, 5, 137, 142, 1998, [Peer-reviewed], [Last author]
  English, Scientific journal
• 大阪府下における通称フェニックスの植栽分布と寒さによる葉の被害程度
  平井源一郎; 平野高司; 西田実
  南紀生物, 40, 79, 81, 1998, [Peer-reviewed]
  Japanese, Symposium
• Time Dependence of the Growth Promotion of Cucumber Seedlings by Blue-Lighting during Morning Twilight.
  SUNG II Kyung; KIYOTA Makoto; TANI Akira; HIRANO Takashi; MURAKAMI Katsusuke; TAIRA Tomoaki
  Environmental Control in Biology, 36, 2, 85, 90, Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists, 1998, [Peer-reviewed]
  Japanese, Scientific journal, Cucumber (Cucumis sativus L. cv. Naoyosi) plants were grown hydroponically at air temperatures of 28/24°C (D/N) and 300μmol m^-2 s^-1 PPF, in a walk-in type growth cabinet equipped with 3-band fluorescent lamps. For 0, 5, 30 or 120 min, blue-lighting at 30 μmol m^-2 s^-1 in PPF was applied daily just before the 14 h photoperiod (morning twilight) . Growth parameters were measured after 12 and 24 d of treatment. After 13 d of treatment, the stomatal conductance, transpiration rate and net photosynthetic rate were measured under 3-band fluorescent lamps at a PPF of 200 μmol m^-2 s^-1. At 17-19 d of treatment, changes in net photosynthetic rate affected by blue-light were measured continuously for 30 min. Fresh and dry weight, leaf area, plant height and stem diameter of plants were the greatest with bluelighting for 5 min. The stomatal conductance, transpiration rate and net photosynthetic rate after 13 d of treatment were greatest in the plants grown with supplemental blue-light for 5 min. The net photosynthetic rate for 5 min treatment increased by 60% as compared with that of control plants grown without lighting. Continuous measurements showed net photosynthetic rate to rise and the high level was maintained with 5 min blue-lighting treatment. These results indicate that the promotion of plant growth by blue-lighting during morning twilight is dependent on the lighting time. For cucumber seedlings, blue-lighting for 5 min was more effective for growth than for 30 and 120 min.
• Effects of Supplemental UV-A Irradiation on Growth and Bitterness of Lettuce and Radish Plants Grown under Artificial Light.
  TOMITA Noriko; HIRANO Takashi; KIYOTA Makoto
  Environmental Control in Biology, 36, 3, 177, 181, Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists, 1998, [Peer-reviewed]
  Japanese, Scientific journal, In order to know the effect of supplemental UV-A irradiation on the growth of lettuce (Lactuca sativa L. cv. Okayama) and radish (Raphanus sativus L, cv. Comet), these plants were grown under artificial irradiation with 3-band fluorescent lamps and additional UV-A lamps. The UV-A irradiation promoted shoot growth of both plants, and reduced the bitter taste intensity of mature lettuce leaves. However, the UV-A effects varied with stage of vegetative development. Moreover, there was no significant effect of the UV-A on the hypocotyl growth of radish plants.
• 樹木によるガス状大気汚染物質の時期別収着速度
  重久眞至; 平野高司; 清田信
  環境情報科学論文集, 12, 35, 42, 1998, [Peer-reviewed]
  Japanese, Scientific journal
• CO２ and Heat exchange of mangrovde forest in Thailand
  Monji N; Hamotani K; Hirano T; Yabuki K; Jintana V
  Journal of Agricultural Meteorology, 52, 489, 492, 1997, [Peer-reviewed]
  English, Scientific journal
• フィールドチャンバーを用いた樹木のガス状大気汚染物質収着速度の測定法
  重久眞至; 平野高司; 清田信
  環境情報科学論文集, 11, 1, 6, 1997, [Peer-reviewed]
  Japanese, Scientific journal
• Intensity Dependence of the Growth Promotion of Cucumber Seedlings by Supplemental Blue-Lighting at Morning Twilight
  SUNG Il Kyung; KIYOTA Makoto; HIRANO Takashi
  Shokubutsu Kankyo Kogaku, 9, 4, 271, 277, JAPANESE SOCIETY OF AGRICULTURAL, BIOLOGICAL AND ENVIRONMENTAL ENGINEERS AND SCIENTISTS, 1997, [Peer-reviewed]
  Japanese, Scientific journal, Cucumber (Cucumis sativus L. cv. Naoyosi) plants were grown hydroponically at air temperatures of 28/24°C (D/N) and 300 μmol m^-2 s^-1 PPFD, in a walk-in type growth cabinet equipped with 3-band fluorescent lamps. At 10, 30, 100, 200 μmol m^-2 s^-1 PPFD, supplemental blue-lighting was applied daily for 5min just before the 14h photoperiod (morning twilight).
  Growth parameters were measured after 7 and 14 days of treatment. After 13 days of treatment, the stomatal conductance, transpiration rate and photosynthetic rate were measured under 3-band fluorescent lamps at a PPFD of 300 μmol m^-2 s^-1. At 12-14 days of treatment, changes in photosynthetic rate were measured continuously for 30 minutes, after the end of supplemental blue-lighting.
  Dry weight, leaf area, stem diameter of plants were the greatest with blue-lighting at 30 μmol m^-2 s^-1 PPFD. The stomatal conductance, transpiration rate and photosynthetic rate after 13days of treatment were greatest in the plants grown with supplemental blue light at 30 and 100 μmol m^-2 s^-1 PPFD. The photosynthetic rate at 30 μmol m^-2 s^-1 PPFD increased by 23% as compared with that of control plants grown without supplemental lighting. Continuous measurements showed photosynthetic rate to rise, and the high level was maintained with 30 μmol m^-2 s^-1 PPFD blue-lighting treatment.
  These results indicate that the promotion of plant growth by supplemental blue-lighting at morning twilight is dependent on the lighting intensity.
• Effects of Ultraviolet-B Radiation and Acid Mist on Growth and Leaf Wettability of Radish Plants
  T. Hirano; N. Tomita; I. Aiga
  Journal of Agricultural Meteorology, 52, 5, 863, 866, 1997, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Characteristics Of CO2 Flux over a Mangrove Forest of Southern Thailand in Rainy Season
  Nobutaka Monji; Ken Hamotani; Takashl Hirano; Kazutoshl Yabuki; Vlpak Jintana
  Journal of Agricultural Meteorology, 52, 2, 149, 154, 01 Sep. 1996, [Peer-reviewed]
  English, Scientific journal
• Vegetation in Sakai city, Osaka as a sink of air pollutants
  Hirano T; Kiyota M; Aiga I
  Bulletin of Osaka Prefecture University, Series B, 48, 55, 64, 1996, [Peer-reviewed], [Lead author, Corresponding author]
  English, Research institution
• Transpirational Characteristics of Mangrove Species in Southern Thailand.
  HIRANO Takashi; MONJI Nobutaka; HAMOTANI Ken; JINTANA Vipak; YABUKI Kazutoshi
  Environmental Control in Biology, 34, 4, 285, 293, Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists, 1996, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal, In order to investigate the seasonal change of transpiration in mangrove species, the sap flow rates (F_s) in Bruguiera cylindrica were measured in southern Thailand, with a stem heat balance method. From the result, the transpiration rates (T_r) normalized by leaf area in wet and dry seasons were estimated to be 0.50 and 1.04 kg m^-2 d^-1 on the average, respectively. T_r in the dry season was rather high compared to that in the wet season. This was probably caused by the difference of meteorological conditions, such as solar radiation and air humidity. Moreover, stomatal conductance (gs) in 4 species, Rhizophora apiculata, Ceriops decandra, Xylocarpus moluccensis and B. cylindrica, was measured in the wet season with a porometry to investigate its interspecific difference. In all the species, g_s reached a plateau at the PPFD of 200 to 400μmol m^-2 s^-1. The plateau in R. apiculata was estimated to be between 150 and 250 mmol m^-2 s^-1 ; the level is similar to that in evergreen trees in Japan. However, g_s in the remaining 3 species was rather low.
• Radiation Environment of Mangrove Pneumatophores in Brackish Water.
  HIRANO Takashi; AIGA Ichiro; MONJI Nobutaka; HAMOTANI Ken; JINTANA Vipak; ISHIKAWA Toshio; YABUKI Kazutoshi
  Environmental Control in Biology, 34, 1, 87, 90, Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists, 1996, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal, The pneumatophores of Avicennia and Sonneratia species photosynthesize and the photosynthetically generated O₂ is used for the respiration in the roots in subsoil. To understand the radiation environment of the pneumatophores, we measured solar radiation on the vertical surface (R_v) in the water with dye films. The R_v averaged over the daytime at a depth of 30 cm was similar to the light compensation points in the pneumatophores. From this result, it can be supposed that the photosynthesis nearly compensated the respiration at a depth of 30 cm and supplied O₂ to the roots in subsoil at shallower places, even when the pneumatophores were submerged in the daytime.
• Effects of volcanic ejecta on plants
  Hirano Takashi
  関西自然保護機構会報, 17, 2, 137, 143, Kanasai Organization for Nature Conservation, 1995, [Peer-reviewed], [Lead author]
  Japanese, Symposium
• Utilization of higher plants in bioregenerative life support systems
  KIYOTA Makoto; TANI Akira; MURAKAMI Katsusuke; HIRANO Takashi; AIGA Ichiro
  CELSS Journal, 7, 2, 27, 34, 1995, [Peer-reviewed]
  Japanese, Scientific journal
• Comparison of the Effects of Sheet Mulch on Improvement of Satsuma Mandarin Cultivation among Several Materials
  HIRANO Takashi; SEKI Kazuo; AIGA Ichiro; KAWASE Kenji
  Environment control in biology, 33, 2, 113, 122, 日本生物環境調節学会, 1995, [Peer-reviewed], [Lead author, Corresponding author]
  Japanese, Scientific journal
• PHYSICAL EFFECTS OF DUST ON LEAF PHYSIOLOGY OF CUCUMBER AND KIDNEY BEAN-PLANTS
  T HIRANO; M KIYOTA; AIGA, I
  ENVIRONMENTAL POLLUTION, 89, 3, 255, 261, 1995, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Single and Combined Effects of O3, NO2 and SO2 on Net Photosynthetic Rate and Leaf Diffusive Conductance in Japanese Cedar Clones.
  HIRANO Takashi; UCHIDA Akio; KIYOTA Makoto; ENOKI Mikio; AIGA Ichiro
  Journal of Japan Society of Air Pollution, 30, 5, 327, 336, Japan Society for Atmospheric Environment, 1995, [Peer-reviewed], [Lead author, Corresponding author]
  Japanese, Scientific journal, The single and combined effects of O₃, NO₂ and SO₂ on net photosynthetic rate (Pn) and leaf diffusive conductance (LDC) in 3-year-old Japanese cedar clones (Cryptomeria japonica D. Don, cv. Shibahara) were investigated. Moreover, the effects of air temperature (15, 25 and 35°C) and humidity (50 and 70% RH) on the response of Pn and LDC in the clones of two cultivars (Shibahara and Nakagen) to the mixture of 0.1 ppm O₃ and NO₂ were also investigated. At 25°C and 70% RH, the Pn and LDC in Shibahara clones did not reduce when they were exposed to 0.1 ppm O₃, NO₂ and SO₂ alone for three hours. However, the exposure to the mixture of the three gases resulted in the significant reductions in Pn and LDC. The reduction in Pn was caused not only by reduction in stomatal conductance but also by that in mesophyll conductance.
  Although there were no effects of the mixture of 0.1 ppm O₃ and NO₂ on Pn, the effects on LDC depended on cultivars, air temperature and relative air humidity. By the exposure to the mixture of O₃ and NO₂, the LDC in Shibahara clones was significantly reduced at 15 and 35°C under the condition of 70% RH, while it was not reduced at 50% RH. On the other hand, no change in the LDC in Nakagen clones simultaneously exposed to O₃ and NO₂ was detected under all experimental conditions.
• Damage by acid rain such as its effects on ecosystem.Effects of acid rain on plants.
  HIRANO Takashi; AIGA Ichiro
  Journal of Environmental Conservation Engineering, 123, 12, 728, 732, Society of Environmental Conservation Engineering, 1994, [Peer-reviewed], [Lead author, Corresponding author]
  Japanese, Research society
• Plant Cultivation System in CELSS.
  AIGA Ichiro; KIYOTA Makoto; HIRANO Takashi; MURAKAMI Katsusuke; TANI Akira
  Environmental Control in Biology, 32, 2, 71, 78, Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists, 1994, [Peer-reviewed]
  Japanese, Scientific journal
• Effects of soil cover with volcanic ash from mt. Unzen-fugendake on the growth of cucumber and gaseous environment in the rhizosphere
  Takashi Hirano; Kazuo Seki; Makoto Kiyota; Ichiro Aiga
  Journal of Agricultural Meteorology, 49, 4, 273, 277, 1994, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Studies on the Effect of the Relative Humidity of the Atmosphere on the Growth and Physiology of Rice Plants
  Gen-ichi HlRAI; Masayo Omori; Hiroyoshi Chujo; Osamu Tanaka; Toshikatsu Okumura; Shiro Takeuchi; Takashi HlRANO
  Japanese Journal of Crop Science, 62, 3, 395, 400, 1993, [Peer-reviewed]
  English, Scientific journal
• 植物による都市の熱環境緩和
  清田信; 平野高司; 相賀一郎
  環境情報科学, 22, 96, 100, 1993, [Peer-reviewed]
  Japanese, Scientific journal
• インドアスペースの植栽に対する光放射環境
  洞口公俊; 森田; 平野高司; 清田信; 相賀一郎
  National Technical Report, 38, 1, 114, 122, 松下電器産業技術総務センター技術情報部, 1992, [Peer-reviewed]
  Japanese, Research institution
• Studies on the Effect of the Relative Humidity of the Atmosphere on the Growth and Physiology of Rice Plants VII. Effect of ambient humidity on the growth and dry matter production at various temperatures
  Gen-Ichi Hirai; Masayo Omori; Hiroyoshi Chujo; Takashi Hirano; Osamu Tanaka
  Japanese Journal of Crop Science, 61, 3, 364, 368, 1992, [Peer-reviewed]
  English, Scientific journal
• Effects of Volcanic Ashes from Mt. Unzen-Fugendake and Mt. Sakurajima on Leaf Temperature and Stomatal Conductance of Cucumber
  Takashi Hirano; Makoto Kiyota; Kazuo Seki; Ichiro Aiga
  Journal of Agricultural Meteorology, 48, 2, 139, 145, 養賢堂, 1992, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• 観葉植物のガス交換と室内ガス環境の改善
  清田信; 平野高司; 石黒武; 三輪; 相賀一郎
  環境情報科学, 21, 107, 111, 1992, [Peer-reviewed]
• 堺市におけるサンゴジュの葉内重金属含有量の20年間の変化
  矢吹万寿; 平野高司; 清田信; 青木正敏; 今村太; 相賀一郎
  環境情報科学, 21, 102, 106, 1992, [Peer-reviewed], [Corresponding author]
  Japanese, Scientific journal
• Growth of Plants and Microclimate in Rice Population I.I. Horizontal distribution of leaf temperature in rice population
  Gen-ichi Hirai; Noboru Nakayama; Hiroyoshi Chujo; Toichiro Inano; Takashi Hirano; Hiroyuki Shimoda; Osamu Tanaka
  Japanese Journal of Crop Science, 61, 1, 41, 48, 1992, [Peer-reviewed]
  English, Scientific journal
• Estimating the Effect of Shading by Road Dust on the Photosynthesis of Satsuma Mandarin Tree
  HIRANO Takashi; KIYOTA Makoto; AIGA Ichiro
  Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi, 26, 5, 352, 358, Japan Society for Atmospheric Environment, 1991, [Peer-reviewed], [Lead author, Corresponding author]
  Japanese, Scientific journal, In order to estimate the effect of road dust on photosynthesis by shading, dust load accumulated on leaf surface of satsuma mandarin trees were investigated. Dust load on leaf surface was indicated by the shading ratio, which was the fraction of light intercepted by the dust on the leaf.
  Dust load on lower surface of leaves were much less than that on upper surface. With the increase of distance from the road, the shading ratio decreased. The maximum value of the shading ratio was 30% at 1 m from the road. The shading ratio on leaves of roadside trees changed remarkably with the changes of traffic and precipitation. On inside leaves of the roadside trees' crown, the change of dust load was less than that on outside leaves.
  The effect of shading by road dust on the photosynthesis of satsuma mandarin trees was estimated every month from July to October in 1989 by using the shading ratio, solar radiation and a light curve of net photosyntheticrate of satsuma mandarin leaf. As a result, when the shading ratio was 10, 20 and 30%, it was estimated that the net photosynthesis of satsuma mandarin was decreased by 5, 9-12 and 16-19%, respectively.
• 水稲における葉温と光合成速度の関係
  平井源一; 中山登; 中條博良; 田中修; 平野高司
  近畿作物育種研究, 36, 91, 93, 1991, [Peer-reviewed]
  Japanese, Scientific journal
• The Effects of Dust by Covering and Plugging Stomata and by Increasing Leaf Temperature on Photosynthetic Rate of Plant Leaves
  Takashi Hirano; Makoto Kiyota; Ichiro Aiga
  Journal of Agricultural Meteorology, 46, 4, 215, 222, 1991, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• The Physical Effects of Dust on Photosynthetic Rate of Plant Leaves
  Takashi Hirano; Makoto Kiyota; Yoshiaki Kitaya; Ichiro Aiga
  Journal of Agricultural Meteorology, 46, 1, 1, 7, 1990, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Effects of the Properties of Plastic Film on Fog Formation in Greenhouses
  Ikuo Horiguchi; Takashi Hirano
  Journal of Agricultural Meteorology, 43, 4, 295, 303, 養賢堂, 1988, [Peer-reviewed]
  English, Scientific journal
• 海洋性冷気流の農業地帯への影響に関する研究―勇払・石狩平野における気温変化―
  平野高司; 堀口郁夫; 谷宏; 松岡延浩
  北海道の農業気象, 37, 18, 20, 1985, [Peer-reviewed], [Lead author]
  Japanese, Scientific journal

• 熱帯泥炭林における二酸化炭素収支の変動要因
  平野高司; 大久保晋治郎; 伊藤雅之; 都築勇人; 坂部綾香; 高橋英紀; キッソ クシン; 大崎満, 日本農業気象学会全国大会講演要旨(CD-ROM), 2024, 2024
• 土壌観測データの統合解析による土壌CO₂収支の解明
  山貫緋称; 市井和仁; 山本雄平; 寺本宗正; 孫力飛; 小嵐淳; 安藤麻里子; 永野博彦; 平野高司; 高木健太郎; 石田祐宣; 高木正博; 近藤俊明; 高橋善幸; 梁乃申, 日本農業気象学会全国大会講演要旨(CD-ROM), 2024, 2024
• Peat carbon
  平野高司, Green Age, 587, 2, 7, Jun. 2023, [Invited], [Lead author, Corresponding author]
  Japanese, Introduction commerce magazine
• Soil carbon dynamics revealed by radiocarbon
  小嵐淳; 安藤麻里子; LIANG Naishen; 近藤俊明; 高木健太郎; 平野高司; 高木正博; 石田祐宣; 寺本宗正; 永野博彦; 市井和仁; 石塚成宏; 平舘俊太郎; 伊藤雅之; SUN Lifei; 國分陽子; 藤田奈津子, 日本生態学会大会講演要旨(Web), 70th, 2023
• 陸域生物圏の機能評価に向けたJapanFluxデータベースの構築
  植山雅仁; 平野高司; 大久保晋治郎; 高木健太郎; 石川守; 中路達郎; 小谷亜由美; 檜山哲哉; 太田岳史; 岩田拓記; 鈴木純; 熊谷朝臣; 羽田泰彬; 高村直也; 浅沼順; 杉田倫明; 小杉緑子; 斎藤琢; 松本一穂; 石田祐宣; 中井太郎; 小宮秀治郎; 町村尚; 植山雅仁; 原薗芳信; 小南裕志; 溝口康子; 高梨聡; 安田幸生; 北村謙三; 松浦陽次郎; 高橋善幸; 平田竜一; 井手玲子; 小野圭介; 杉浦裕義; 村山昌平; 中屋耕, 日本農業気象学会全国大会講演要旨(CD-ROM), 2023, 2023
• 長期温暖化実験による北海道最北の森林泥炭地における三年間の土壌CO₂とCH₄フラックスの変化
  馬鋭麒; 高木健太郎; 平野高司; 孫力飛; 梁乃申; 高橋善幸; 寺本宗正; 近藤俊明; 小嵐淳; 安藤麻里子; 石田祐宣; 高木正博; 市井和仁, 日本農業気象学会全国大会講演要旨(CD-ROM), 2023, 2023
• 白神山地の森林土壌におけるメタンフラックスの乾燥年と湿潤年の比較
  石田祐宣; 石川輝; 孫力飛; 梁乃申; 寺本宗正; 平野高司; 高木健太郎; 高木正博; 近藤俊明; 小嵐淳; 安藤麻里子; 市井和仁; 高橋善幸, 日本農業気象学会全国大会講演要旨(CD-ROM), 2023, 2023
• 熱帯泥炭林のオイルパーム農園への転換で発生した粗大有機物の分解量の評価
  平野高司; 村田祥子; 平田竜一; 白石知弘; 林真智; 伊藤雅之; WAILI Joseph Wenceslaus; MUSIN Kevin Kemudang; AERIES Edward Baran; LO Kim San; KIEW Frankie; WONG Guan Xhuan; TANG Angela; MELLING Lulie, 日本農業気象学会全国大会講演要旨(CD-ROM), 2020 (CD-ROM), 2020
• Influence of global warming on soil organic carbon decomposition in Asian monsoon forests and the feedback
  LIANG Naishen; 寺本宗正; 高木健太郎; 近藤俊明; 小嵐淳; 安藤麻里子; 平野高司; 高橋善幸; 高木正博; 石田祐宣; 荒巻能史; 楢本正明; ZHANG Yiping; ZHANG Yiping; LAI Derrick Y.F.; CHIANG Po-Neng; ZENG Jiye; PIAO Hilong; LI Shenggong; 冨松元; ZHAO Xin; 中根周歩; YAO Tze-Leong, 日本生態学会大会講演要旨(Web), 67th, 2020
• Response and Feedback of Asian Forest Soil Carbon Flux to Global Warming
  LIANG NAISHEN; Ando Mariko; Ishida Sachinobu; Takagi Masahiro; Takahashi Yoshiyuki; Teramoto Munemasa; Zhao Xin; Tomimatsu Hajime; Takagi Kentaro; Hirano Takashi; Kondo Toshiaki; Koarashi Jun, The Japanese Forest Society Congress, 130, 0, 701, 701, 2019
  

  [in Japanese]

  , THE JAPANESE FORESTRY SOCIETY, Japanese
• 北海道冬小麦圃場における分光画像モニタリングによるタンパク質含有率の推定
  吉川慶; 濱嵜孝弘; 加藤知道; 矢崎友嗣; 栗原純一; 井手玲子; 小熊宏之; 広田知良; 平野高司, 生物と気象, 18, 2, 2018
• Prediction of forest GPP using hyper-spectral images
  吉川慶; 高木健太郎; 矢崎友嗣; 平野高司; 井手玲子; 小熊宏之; 廣瀬保雄; 栗原純一, 日本リモートセンシング学会学術講演会論文集(CD-ROM), 63rd, 2017
• 熱帯泥炭湿地林の環境変化が泥炭分解呼吸に及ぼす影響
  伊藤雅之; 沖元洋介; KUSIN Kitso; 平野高司, 日本農業気象学会全国大会講演要旨/Proceedings of International Symposium on Agricultural Meteorology, 2017, 49, 2017
  Japanese
• 熱帯泥炭湿地林における群落スケールメタンフラックスの解明
  坂部綾香; 伊藤雅之; KITSO Kushin; 平野高司, 日本農業気象学会全国大会講演要旨/Proceedings of International Symposium on Agricultural Meteorology, 2017, 50, 2017
  Japanese
• 生態系機能モニタリング技術の現状と展望
  大政謙次; 平野高司, 生物の科学 遺伝, 71, 1, 42, 48, Jan. 2017, [Invited]
  Japanese, Introduction commerce magazine
• 熱帯泥炭湿地の急速な環境変化が地下水中の溶存態有機炭素動態に及ぼす影響
  伊藤雅之; 西村裕志; 平野高司; Gunawan Haris; Kitso Kusin; 甲山 治; 田中洋太郎; 勝山 正則, 日本地球惑星科学連合JpGU 2016年大会, 24 May 2016
• ハイパースペクトルカメラを用いた森林跡地におけるクロロフィル指標の時空間変動解析
  吉川慶; 矢崎友嗣; 井手玲子; 栗原純一; 平野高司, 日本農業気象学会全国大会講演要旨/Proceedings of International Symposium on Agricultural Meteorology, 2016, 140, 2016
  Japanese
• 地上タワー観測によるクロロフィル蛍光を利用したスギ・ヒノキ植林の光合成機能の季節変化
  辻本克斗; 加藤知道; 平野高司; 斎藤琢; 永井信; 秋津朋子; 奈佐原顕郎, 日本地球惑星科学連合大会予稿集(Web), 2015, 2015
• Estimation of regional-scale forest resources using ICESat/GLAS spaceborne LiDAR
  Masato Hayashi; Nobuko Saigusa; Habura Borjigin; Yoshito Sawada; Yoshiki Yamagata; Takashi Hirano; Kazuhito Ichii, EARTH RESOURCES AND ENVIRONMENTAL REMOTE SENSING/GIS APPLICATIONS VI, 9644, 2015
  English
• 熱帯泥炭生態系の炭素動態に関するフィールド研究
  平野高司, 地球環境研究センターニュース, 25, 5, 2, 7, 2014, [Invited]
  Japanese, Introduction other
• 陸域生態系の二酸化炭素収支－地上観測から見えてきたこと
  平野 高司, 遺伝, 67, 4, 510, 515, Jun. 2013
  Japanese, Introduction commerce magazine
• Lessons learned from CarboEastAsia: carbon and water cycles in East Asian terrestrial ecosystems
  Joon Kim; Takashi Hirano; Guirui Yu; Shenggong Li; Koji Tamai, JOURNAL OF FOREST RESEARCH, 18, 1, 1, 3, Feb. 2013
  English, Others
• An automated-chamber network for evaluation of carbon budget of Asian terrestrial ecosystems
  Liang, N; Wang, Y; Zhang, Y; He, J; Li, S; Piao, S; Fang, J; Hirano, T; Takagi, K; Fletcher, C.D; Teramoto, M; Tan, Z.-H, AsiaFlux Newsletter, 35, 3, 12, 2013
  English, Report scientific journal
• アジアの森林の光合成・呼吸パラメータについて
  高木健太郎; 平田竜一; 平野高司; 植山雅仁; 小野圭介; 井手玲子; 小川安紀子; 三枝信子; 高橋善幸; 市井和仁; KWON H; HONG J; LEIMING Z; LI S.‐G; HAN S; WANG H.‐M; ZHANG Y.‐P; 浅沼順; 蒲生稔; 前田高尚; 村山昌平; 町村尚; 中井裕一郎; 太田岳史; 斎藤琢, 日本農業気象学会全国大会講演要旨, 2012, 33, 2012
  Japanese
• サロベツ湿原における泥炭中の炭素蓄積量とその空間分布推定
  高田雅之; 井上京; 平野高司, 農業農村工学会大会講演会講演要旨集, 2011, 706-707, 12 Aug. 2011
  Japanese
• サロベツミズゴケ湿原における炭素収支へのササ侵入の影響
  泉弥希; 清水真理子; 山田浩之; 梶原直哉; 石倉究; 延岡裕太; 平野高司; 波多野隆介, 日本土壌肥料学会講演要旨集, 57, 57, 294, 294, 08 Aug. 2011
  一般社団法人日本土壌肥料学会, Japanese
• 27 サロベツミズゴケ湿原における炭素収支へのササ侵入の影響(北海道支部講演会,2010年度各支部会講演要旨)
  泉 弥希; 清水 真理子; 山田 浩之; 梶原 直哉; 石倉 究; 延岡 裕太; 平野 高司; 波多野 隆介, 日本土壌肥料学会講演要旨集, 0, 57, 294, 294, 08 Aug. 2011
  一般社団法人日本土壌肥料学会, Japanese
• カラマツ林風倒壊跡地における炭素交換量および蓄積量
  佐野智人; 平野高司; 梁乃申; 藤沼康実, 日本生態学会大会講演要旨集, 58th, 304, 08 Mar. 2011
  Japanese
• 河川改修の影響を受けたサロベツ湿原ドームドボッグからの地下水溶存態炭素の流出
  平岡亮太郎; 山田浩之; 平野高司, 応用生態工学会研究発表会講演集, 15th, 7-8, 2011
  Japanese
• 台風撹乱後のカラマツ林における炭素収支
  佐野智人; 平野高司; 梁乃申; 平田竜一; 藤沼康実, 日本農業気象学会全国大会講演要旨, 2011, 195, 2011
  Japanese
• サロベツ湿原における泥炭地からの地下水と溶存態炭素の流出
  山田浩之; 平岡亮太郎; 田中祥人; 平野高司, 日本農業気象学会全国大会講演要旨, 2011, 61, 2011
  Japanese
• エルニーニョが東南アジアの陸域植生に与える影響
  平田竜一; 平野高司; 市井和仁; 植山雅仁, 日本農業気象学会全国大会講演要旨, 2011, 58, 2011
  Japanese
• P23-8 CO_2 and heat fluxes in flooded and aerobic rice fields in the Philippines
  Alberto Ma. Carmelita; Wassmann Reiner, Abstracts of the meeting, the Society of the Science of Soil and Manure, 0, 56, 189, 189, 07 Sep. 2010
  Japanese Society of Soil Science and Plant Nutrition, English
• 苫小牧フラックスリサーチサイトにおける森林生態系環境の総合的観測-モニタリングデータブック-3.土壌・植生およびリモートセンシング 3.3 森林植生の生理機能
  ロペス ラリー; 平野高司; 小林菜花子; 藤沼康実; 小池孝良; 北岡哲, 苫小牧フラックスリサーチサイトにおける森林生態系環境の総合的観測 モニタリングデータブック 平成22年, 2010
• 苫小牧フラックスリサーチサイトにおける森林生態系環境の総合的観測―モニタリングデータブック―5.関連研究 5.4 北方カラマツ林における大気中生物起源有機化合物の採取と測定の概要
  家田曜世; 北森康之; 持田陸宏; 平田竜一; 平野高司; 藤沼康実; 河村公隆, 苫小牧フラックスリサーチサイトにおける森林生態系環境の総合的観測 モニタリングデータブック 平成22年, 166, 171, 2010
  Japanese
• サロベツ湿原のエネルギー収支
  大下亮平; 平野高司; 山田浩之; 高橋英紀, 日本農業気象学会全国大会講演要旨, 2010, 38, 2010
  Japanese
• Long-term monitoring of carbon and water cycles in larch forest ecosystems in East Asia
  Saigusa, N; Takagi, K; Hirano, T, iLEAPS Newsletter, 6, 44, 45, 2009
  English, Report scientific journal
• A study on the carbon balance of tropical peatland
  平野 高司, Japanese journal of international forest and forestry, 73, 2, 7, Sep. 2008
  国際緑化推進センター, Japanese
• チャンバー法による土壌からの炭素放出観測の展開
  梁乃申; 藤沼康実; 向井人史; 高橋善幸; Seong-Dong Kim; 平野高司; 高木健太郎; 下山宏; 中根周歩; Yongwon Kim, CGER リポート, M019-2008, 33, 36, 2008
  Japanese, Introduction research institution
• 30 経年採草地における土壌有機物分解の動態解析(北海道支部講演会,2006年度各支部会)
  清水 真理子; 丸谷 暁; Desyatkin Alexey; 平野 高司; 兒玉 裕二; 波多野 隆介, 日本土壌肥料学会講演要旨集, 0, 53, 236, 236, 22 Aug. 2007
  一般社団法人日本土壌肥料学会, Japanese
• 25 クローズドチャンバー法による土壌呼吸の自動測定と手動測定の比較(北海道支部講演会,日本土壌肥料学会 支部講演会講演要旨集 2005年度)
  清水 真理子; 平野 高司; 兒玉 裕二; 波多野 隆介, 日本土壌肥料学会講演要旨集, 0, 51, 241, 241, 06 Sep. 2005
  一般社団法人日本土壌肥料学会, Japanese
• 北方林の存続と気象・攪乱環境
  平野 高司, 北方林業, 57, 8, 180, 182, Aug. 2005
  北方林業会, Japanese
• 続・環境負荷を予測する<（波多野・犬伏編）>
  博友社, 2005
• 森林の科学<（中村・小池編著）>
  朝倉書店, 2005
• 変動する入力に従って動的に可変なフレームワーク(ダイナスキーム)の可能性
  大場 真; 平野 高司; 高橋 英紀, 生物と気象, 4, 3, 119, 124, Sep. 2004
  日本農業気象学会, Japanese
• 国際会議報告 2003年アメリカ地球物理学連合(AGU)秋季集会の印象と最近の地球環境研究の動向
  平野 高司; 三枝 信子; 下山 宏, 生物と気象, 4, 2, 57, 62, Jun. 2004
  日本農業気象学会, Japanese
• 陸域生態系における二酸化炭素等のフラックス観測の実際
  CGER-REPORT（CGER-M015-2003）, 2004
• 新農業情報工学<農業情報学会編>
  養賢堂, 2004
• 温室効果ガスのモニタリングと森林フラックスの測定 (地球温暖化--世界の動向から対策技術まで) -- (第3編 測定技術とモニタリング)
  藤沼 康実; 三枝 信子; 平野 高司, 生物の科学「遺伝」別冊, 0, 17, 48, 57, Nov. 2003
  裳華房, Japanese
• P248 カラマツ林における冬期積雪条件でのCO_2フラックス
  平野 高司; 平田 竜一; 三枝 信子; 藤沼 康実, 大会講演予講集, 83, 0, 348, 348, 21 May 2003
  社団法人日本気象学会, Japanese
• P247 フラックス観測による生態系レベルでの生物反応の検出とその解釈 : 苫小牧フラックスリサーチサイト(カラマツ林)におけるCO_2・水蒸気フラックス長期観測
  三枝 信子; 山本 晋; 近藤 裕昭; 平野 高司; 鳥山 敦; 藤沼 康実, 大会講演予講集, 83, 0, 347, 347, 21 May 2003
  社団法人日本気象学会, Japanese
• カラマツ林上のフラックスに及ぼす風速の影響
  鳥山敦; 北宅善昭; 平野高司; 三枝信子; 藤沼康実, 日本農業気象学会全国大会日本生物環境調節学会大会合同大会講演要旨, 2003, 2003
• Runoff Characteristics of North-and South-facing slope in the Caribou Poker Creek Research Watershed, interior Alaska
  Urano, S; Okada, K; Yabe, K; Kawauchi, K; Takahashi, N; Nakai, T; Yazaki, T; Hirano, T; Ishikawa, N; Hinzman, L, Tohoku Geophysical Journal, 36, 4, 466, 470, 2003
  Faculty of Science, Tohoku University, Japanese
• Effect of Sampling method, Cycle and Devices on Precipitation Components : General Discussion of Datasets Obtained from Japanese Acid Depesition Survery (2)
  Noguchi Izumi; Kato Takunori; Akiyama Masayuki; Takada Masayuki; Nakamura Yoshihiro; Yamaguchi Takashi; Fujinuma Yasumi; Hirano Takashi, 大気環境学会年会講演要旨集, 0, 44, 605, 605, 2003
  Japan Society for Atmospheric Environment, Japanese
• 『地球温暖化－世界の動向から対策技術まで－』<大政謙次・原沢英夫/（財）遺伝学普及協会編>
  裳華房, 2003
• インドネシアの熱帯泥炭林におけるCO_2フラックスの長期観測
  平野 高司; JUNE Tania; SEGAH Hendrik; LIMIN Suwido; 平田 竜一; 大崎 満, 大会講演予講集, 82, 397, 397, 09 Oct. 2002
  Japanese
• カラマツ林におけるキャノピー上とトランクスペースのCO_2フラックス
  平田 竜一; 平野 高司; 藤沼 康実; 三枝 信子; 山本 晋, 大会講演予講集, 82, 30, 30, 09 Oct. 2002
  Japanese
• 2F0945 Measurement of CO2 flux above a northern larch forest in 2001
  Toriyama Atsushi; Hirano Takashi; Saigusa Nobuko; Takada Masayuki; Fujinuma Yasumi, 大気環境学会年会講演要旨集, 43, 419, 419, 2002
  大気環境学会, Japanese
• P40 Seasonal variation in CO_2 efflux from the soil surface of a cool-temperate deciduous forest
  Hirano T; Tanaka Y, 大気環境学会年会講演要旨集, 0, 42, 455, 455, 06 Oct. 2001
  Japan Society for Atmospheric Environment, Japanese
• 北方森林土壌におけるCO2の動態と発生量に関する研究
  平野 高司, 食生活科学・文化及び地球環境科学に関する研究助成研究紀要, 17, 115, 120, 2001
  アサヒビール学術振興財団, Japanese
• P39 Measurement of CO_2 flux above a larch plantation in the cool-temperate zone
  Fujinuma Y.; Hirano T.; Takada M.; Inoue G.; Saigusa N.; Yamamoto S.; Harazono Y., 大気環境学会年会講演要旨集, 42, 454, 454, 2001
  大気環境学会, Japanese
• 落葉広葉樹林の土壌呼吸量の評価
  平野高司, 農業環境工学関連4学会2001年合同大会講演要旨集, 328, 2001
• マングローブ林上における熱とCO_2の交換
  土佐 竜一; 鱧谷 憲; 文字 信貴; 矢吹 萬壽; 平野 高司; JINTANA Vipak; PIRIYAYOTA Somsak; 西宮 明文; 岩崎 正浩, 大会講演予講集, 78, 285, 285, 18 Oct. 2000
  Japanese
• 落葉広葉樹林の土壌中CO2濃度の変動
  平野高司, 日本農業気象学会2000年度全国大会 日本生物環境調節学会2000年大会合同大会講演要旨集, 410, 411, 2000
• 落葉広葉樹林の土壌からのCO2放出速度の日および季節変化
  平野高司, 日本農業気象学会2000年度全国大会 日本生物環境調節学会2000年大会合同大会講演要旨集, 170, 171, 2000
• アラスカ永久凍土地帯における夏期の微気象と蒸発散量
  中井太郎; 浦野慎一; 平野高司; 矢部和夫; 河内邦夫; 石川信敬; Hinzman, L, 平成9年度～平成11年度科学研究費補助金(基礎研究B(2))研究成果報告書（研究課題番号09460117）, 126, 145, 2000
• 1D11 Diurnal change of CO_2 efflux from a deciduous broad-leaved forest floor
  Hirano T; Setoyama Y; Tanaka Y, 大気環境学会年会講演要旨集, 0, 40, 389, 389, 28 Sep. 1999
  Japan Society for Atmospheric Environment, Japanese
• Seasonal Change in Sorption Rates of Gaseous Air Pollutants by Trees
  SHIGEHISA Shinji; HIRANO Takashi; KIYOTA Makoto, Papers on environmental information science, 12, 281, 286, 16 Nov. 1998
  環境情報科学センター, Japanese
• 1D1030 Contact angle measurement on tree leaves
  Hirano T; Ejiri S, 大気環境学会年会講演要旨集, 0, 39, 239, 239, 24 Sep. 1998
  Japan Society for Atmospheric Environment, Japanese
• 2D0930 Effect of CO_2 concentration on O_3,NO_2,NO sorption rates of trees
  S. Shinji; H. Takashi; K. Makoto, 大気環境学会年会講演要旨集, 39, 340, 340, 1998
  大気環境学会, Japanese
• 『農学・生態学のための気象環境学』<文字信貴, 平野高司, 高見晋一, 堀江 武, 桜谷哲夫>
  丸善, 1997
• Effects of UV-B radiation on growth of crops
  Hirano Takashi; Uchida Akio; Tomita Noriko; Aiga Ichiro, Proceeding of Annual Conference of The Illuminating Engineering Institute of Japan, 29, 351, 352, 31 Aug. 1996
  The Illuminating Engineering Institute of Japan (IEIJ), Japanese
• Studies on the Effects of Dust on Photosynthesis of Plant Leaves
  HIRANO Takashi, Bulletin of the University of Osaka Prefecture. Ser. B, Agriculture and life sciences, 46, 237, 271, 31 Mar. 1994
  Various types of dust are emitted artificially and naturally into the atmosphere through industrial processes, road traffic, volcanic eruptions, dust storms, etc. Around such sources a large quantity of dust cover on vegetation has been frequently observed. A highly alkaline dust like cement dust injures plant leaves visibly; even chemically inert dust affects photosynthesis and transpiration physically when it accumulates on leaf surfaces. Covering and plugging stomata, shading, increasing leaf temperature and removing cuticular wax were reported as physical effects of dust. On photosynthesis, however, almost all the previous studies only guessed the physical effects in their discussions. There are not enough related studies based on well-designed experiments. The aims of this study were to investigate the physical effects of the dust accumulating on plant leaves on photosynthesis, such as shading, plugging stomata and increasing leaf temperature, in detail, and to estimate the reduction in photosynthesis quantitatively. First, the photosynthetic rate, the transpiration rate, the stomatal conductance and the temperature of cucumber (Cucumis sativus) and kidney bean (Phaseolus vulgaris) leaves covered by chemically inert dust (Kanto loam powder and carbon black, JIS Z 8901) were measured under various conditions. Second, the similar experiments were conducted by the use of several kinds of volcanic ash from Mt. Sakurajima and Mt. Unzen-Fugendake. Last, in order to investigate the real conditions of dust, shading coefficients of the dust on the leaf surfaces of satsuma mandarin (Citrus unshiu) around the road for dump trucks and Viburnum awabuki in the urban area and suburbs in Sakai city were measured, and the reduction in photosynthesis of satsuma mandarin leaves by shading was estimated from shading coefficients and solar radiation. The results obtained in this study are summarized as follows. 1. The dust was found to decrease stomatal conductance by plugging stomata under a light condition when the stomata were open during dust exposure. The effect was larger when the dust load was larger or the particle size of the dust was smaller. However, the effect was negligible when the stomata were closed during exposure. The dust decreased the photosynthetic rate by shading the leaf surface. The dust with finer particles had a larger shading coefficient. Moreover, the additional absorption of incident short-wave radiation by the dust increased the leaf temperature, and consequently changed the photosynthetic rate in accordance with its response curve to leaf temperature. The increase in leaf temperature increased the transpiration rate. 2. The particle size distribution of volcanic ash was varied with sampling location and the date of eruption. The volcanic ash with smaller particle size and higher light reflectance had a larger shading coefficient. Since ash particles entered stomatal cavities, the stomatal conductance of cucumber leaf was decreased significantly under a light condition, even after they were washed out from the leaf surface. The temperature of the leaf covered with the ash from Mt. Sakurajima at a rate of 50gm^<-2> increased by 2.5℃ under solar radiation of 870Wm^<-2>. 3. A large quantity of dust originated from soil scattering was observed on the upper surface of satsuma mandarin leaves near the road. However, little dust was on the lower surface of the leaves, and the dust load decreased drastically with a distance from the road. While the shading coefficient of the dust on the upper surface of the leaves located in the outside of a crown changed with traffic density of dump tracks and the amount of precipitation, that in the inside little changed. The result of the estimation showed that the shading by dust decreased the net photosynthesis of satsuma mandarin leaves for each month from July to October in 1989 by 5, 9-12, 16-19 and 22-30%, respectively, when shading coefficients were 10, 20, 30 and 40%. In August 1989, the shading coefficients exceeded 30% at trees near the road. 4. The dust contaminated the leaf surfaces of Viburnum awabuki gradually in the urban area and suburbs in Sakai city. In October 1990, the mean of shading coefficients of dust on the upper and lower leaf surfaces were 4.9 and 1.6%, respectively. The coefficients around a main road doubled the mean value. In this study, it was found that dust accumulating on leaf surfaces decreases the photosynthetic rate by the following physical effects, plugging the stomata, shading and increasing the leaf temperature. The results suggest that plants around large dust sources are accompanied by the danger of a chronic decrease in photosynthesis, and consequently in growth. Examination of physical property of dust and understanding of its effect on photosynthesis enable us to estimate damage of plants. It can be said that the estimate of reduction in photosynthesis by dust from the shading coefficient are practical., Osaka Prefecture University, Japanese
• 観葉植物のガス交換と室内環境の改善
  清田信; 平野高司; 北宅善昭; 辻謙一; 相賀一郎, 日本農業気象学会全国大会日本生物環境調節学会大会合同大会講演要旨, 29th, 1991
• 異なる温度における数種野菜の光合成速度におよぼす培養液中のNaCl濃度の影響
  清田信; 平野高司; 北宅善昭; 伊泉秀悦; 相賀一郎, 日本農業気象学会全国大会日本生物環境調節学会大会合同大会講演要旨, 29th, 1991
• 123 水田における水稲個体群の平均葉温と気象要素との関係
  平井 源一; 中山 登; 中條 博良; 稲野 藤一郎; 平野 高司; 下田 裕之; 田中 修, 日本作物學會紀事, 59, 2, 245, 246, 10 Oct. 1990
  日本作物学会, Japanese
• 103 大型水田における水稲個体群表面温度(葉温)の分布について
  平井 源一; 中山 登; 中條 博良; 稲野 藤一郎; 平野 高司; 下田 裕之; 田中 修, 日本作物學會紀事, 59, 1, 206, 207, 01 Apr. 1990
  日本作物学会, Japanese

• 農業気象学入門
  平野高司, 異常気象と気候変動，光合成と気象環境
  文永堂出版, Jan. 2021, 9784830041419, xvi, 301p, Japanese, [Joint work]
• 持続可能な社会への道 : 環境科学から目指すゴール
  平野高司, 熱帯における土地利用変化と物質循環
  日本学術協力財団, Oct. 2020, 9784990997236, 263p, Japanese, [Joint work]
• 農業気象・環境学
  平野高司, 地表近くを吹く風，熱と物質の流れ，植物群落の熱・物質収支の測定法
  朝倉書店, Apr. 2020, 9784254440300, ix, 199p, 図版 [2] 枚, Japanese, [Joint editor]
• 森林と地球環境変動
  平野高司, 熱帯林への気候変動および人間活動の影響
  共立出版, Dec. 2019, 9784320058224, xii, 216p, 図版 [12] p, Japanese, 13443393, [Joint work]
• 図説 日本の湿地
  平野 高司, 二酸化炭素の吸収と蓄積
  朝倉書店, Jun. 2017, [Contributor]
• 湿地の科学と暮らし 北のウエットランド大全
  HIRANO Takashi, 湿地の炭素固定機能
  北海道大学出版会, Apr. 2017, [Contributor]
• Tropical Peatland Ecosystems
  Wataru Takeuchi; Takashi Hirano; Orbita Roswintiarti, Estimation model of graound water table at peatland in Central Kalimantan, Indonesia
  Springer, 2016, [Joint work]
• サロベツ湿原と稚咲内砂丘林帯湖沼群
  平野 高司, 地表のエネルギー収支と蒸発散
  北海道大学出版会, 2014, [Joint work]
• 北海道の気象と農業（日本農業気象学会北海道支部）
  平野 高司, はじめに，森林と大気の関係
  北海道新聞社, Nov. 2012, [Editor]
• Agricultural Sciences for Human Sustainability
  平野高司, Carbon dioxide exchange between the atmosphere and terrestrial ecosystems
  海青社, Jun. 2012, [Contributor]
• The Biodiveristy Observation Network in the Asia-Pacific Region, Ecological Research Monographs
  Osaki M; Hirano T; Inoue G; Honma T; Takahashi H; Takeuchi W; Kobayashi N; Evri M; Kohyama T; Ito A; Setiadi B; Sekine H; Hirose K, Sensing/monitoring networks on carbon balance and biodiversity in tropical peatland
  Springer, 2012, [Contributor]
• 生物環境気象学
  浦野 慎一; 山川 修治; 文字 信貴; 小林 哲夫; 大槻 恭一; 平野 高司; 町村 尚; 上村 賢治; 鈴木 晴雄; 谷 宏; 蔵田 憲次; 干場 信司; 蓑輪 雅好, 光合成による生物生産，異常気象と気候変動
  文永堂出版, 2009, 9784830041167, Japanese, [Contributor]
• 続・環境負荷を予測する（日本土壌肥料学会監修）
  平野高司; 児玉裕二; 梁 乃申, 土壌呼吸の自動測定
  博友社, Sep. 2005, [Contributor]
• 森林の科学（中村太士，小池孝良編著）
  平野 高司, 北方林と気候との相互作用
  朝倉書店, Sep. 2005, [Contributor]
• 新農業情報工学（農業情報学会編）
  平野 高司, 気象予測
  養賢堂, Aug. 2004, [Contributor]
• 陸域生態系における二酸化炭素等のフラックス観測の実際（AsiaFlux運営委員会編）
  平野高司; 三枝信子, 渦相関法によるフラックス測定の実際
  国立環境研究所地球環境研究センター, 2004, [Contributor]
• 地球温暖化－世界の動向から対策技術まで－
  藤沼康実; 三枝信子; 平野高司, 温室効果ガスのモニタリングと森林フラックスの測定
  裳華房, Nov. 2003, [Contributor]
• 地表面フラックス測定法（気象研究ノート199）
  平野 高司, 土壌呼吸量
  日本気象協会, Mar. 2001, [Contributor]
• 農学・生態学のための気象環境学
  文字信貴; 平野高司; 高見晋一; 堀江武; 桜谷哲夫; 文字 信貴; 高見 晋一; 桜谷 哲夫; 平野 高司; 堀江 武, 植物の放射環境，地表に接した大気の特徴，熱と物質の流れ，環境汚染と植物
  丸善, Aug. 1997, 462104351X, 199, [Joint editor]
• 新版 生物環境調節ハンドブック（日本生物環境調節学会編）
  平野 高司, 環境に対する生物の反応（エアロゾル，粉じん）
  養賢堂, Apr. 1995, [Contributor]

• Networking flux researches to assess the carbon balance of tropical peatland ecosystems in SE Asia
  HIRANO Takashi
  9th AsiaFlux Workshop, 09 Nov. 2011, English, Invited oral presentation
  [Invited], [International presentation]
• Evapotranspiration of peatlands with different vegetation types
  HIRANO Takashi
  Yangling International Agri-Science Forum 2011, 04 Nov. 2011, English, Public discourse
  [Invited], [International presentation]
• Increasing vulnerability of tropical peat carbon
  HIRANO Takashi
  3rd ASIAHOECs Joint Symposium, 25 Oct. 2011, English, Invited oral presentation
  [Invited], [International presentation]
• Carbon Flux in Tropical Peat
  HIRANO Takashi
  5th Technical Roundtable on MRV "Key Workshop on MRV and REDD+", 31 Oct. 2010, English, Invited oral presentation
  [International presentation]
• 熱帯泥炭林の現状と炭素収支
  平野高司
  SELIS-GCOE合同セミナー, 05 Oct. 2010, Japanese, Public discourse
  [Invited], [Domestic Conference]
• Effect of drainage on soil respiration in tropical peat swamp forest
  HIRANO Takashi
  International Workshop on "Wild fire and carbon management in Peat-Forest in Indonesia", 22 Sep. 2010, English, Keynote oral presentation
  [International presentation]
• 熱帯泥炭林の炭素収支
  平野高司
  統合的陸域圏研究連絡会, May 2009, Japanese, Public discourse
  [Invited], [Domestic Conference]
• Fire, degradation and carbon flux: monitoring and field experiment in East Asia
  HIRANO Takashi
  IGBPシンポジウム, 14 Apr. 2009, English, Invited oral presentation
  [International presentation]
• 陸上植物はどれだけ二酸化炭素を吸収しているのか？
  平野高司
  北海道芝草研究会講演会, Jan. 2009, Japanese, Public discourse
  [Invited], [Domestic Conference]
• タワー観測ネットワーク（JapanFlux）の現状
  平野高司
  地球観測連携拠点国内ワークショップ, Dec. 2008, Japanese, Public discourse
  [Invited], [Domestic Conference]
• 微気象学的方法による陸域生態系の炭素吸収量の推定 －わかることとわからないこと－
  平野高司
  日本農業気象北海道支部・東北支部合同シンポジウム, Nov. 2008, Japanese, Invited oral presentation
  [Invited], [Domestic Conference]
• フラックス研究の現状と将来像
  平野高司
  日本農業気象学会シンポジウム, Nov. 2008, Japanese, Invited oral presentation
  [Invited], [Domestic Conference]
• Carbon dioxide balance of tropical and temperate forests
  HIRANO Takashi
  G8関連シンポジウム, Jul. 2008, English, Invited oral presentation
  [Invited], [International presentation]
• 泥炭と地球環境
  平野高司
  北海道土質試験協同組合技術懇談会, May 2008, Japanese, Public discourse
  [Invited], [Domestic Conference]
• 熱帯泥炭の炭素収支
  平野高司
  「熱帯泥炭のCDM化」ワークショップ, 29 Aug. 2007, Japanese, Public discourse
  [Domestic Conference]
• Field manipulative experiments for evaluating disturbance effects on ecosystem carbon exchange
  HIRANO Takashi
  International Symposium on monitoring and predicting the change in the terrestrial human-environment systems, Feb. 2006, English, Public discourse
  [Invited], [International presentation]
• 空気質と植物生産
  平野高司
  植物工場学会北海道支部講演会, Nov. 2005, Japanese, Public discourse
  [Invited], [Domestic Conference]
• Three years of flux measurement at Tomakomai FRS
  HIRANO Takashi
  APGC-Post Flux Meeting, Oct. 2004, English, Public discourse
  [Invited], [Domestic Conference]
• 苫小牧カラマツ林におけるCO2フラックスモニタリング
  平野高司
  IGBP国内シンポジウム, Mar. 2001, Japanese, Public discourse
  [Invited], [Domestic Conference]
• 植物のガス交換計測
  平野高司
  日本農業気象学会北海道支部講演会, Dec. 2000, Japanese, Public discourse
  [Invited], [Domestic Conference]
• 都市の大気汚染と植物
  平野高司
  日本農業気象近畿支部50周年記念シンポジウム, Nov. 1996, Japanese, Invited oral presentation
  [Invited], [Domestic Conference]
• 作物の成長に与える紫外線（UV-B）の影響
  平野高司
  照明学会1996年全国大会, Jun. 1996, Japanese, Public discourse
  [Invited], [Domestic Conference]

• 地域環境学特論Ⅰ, 2024年, 修士課程, 農学院
• 温暖化影響学総論, 2024年, 修士課程, 農学院
• 環境と人間, 2024年, 学士課程, 全学教育
• 環境化学, 2024年, 学士課程, 農学部
• 環境と人間, 2024年, 学士課程, 全学教育
• 情報解析学, 2024年, 学士課程, 農学部
• 生態環境物理学, 2024年, 学士課程, 農学部
• 農業気象学, 2024年, 学士課程, 農学部
• 地学概論, 2024年, 学士課程, 農学部

• The Ecological Society of Japan
• JpGU
• The meteorological Society of Japan
• Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists
• AsiaFlux
• The Society of Agricultural Meteorology of Japan
• JapanFlux

• Investigating temporal variation in forest root respiration using eddy CO2 flux
  Grants-in-Aid for Scientific Research Grant-in-Aid for Transformative Research Areas (A)
  Jun. 2022 - Mar. 2024
  Takashi Hirano
  Japan Society for the Promotion of Science, Grant-in-Aid for Transformative Research Areas (A), Hokkaido University, Principal investigator, 22H05706
• 熱帯泥炭林のオイルパーム農園への転換による生態系機能の変化と大気環境への影響
  科学研究費補助金（基盤研究S）
  Jul. 2019 - Mar. 2024
  平野 高司
  文部科学省, Principal investigator, Competitive research funding
• メタン吸収能を含めたアジア域の森林における土壌炭素動態の統括的観測に基づいた気候変動影響の将来予測
  環境省環境研究総合推進費
  Apr. 2020 - Mar. 2023
  梁乃申; 高橋善幸; 高木健太郎; 平野高司; 石田祐宣; 髙木正博; 市井和仁; 近藤俊明; 小嵐淳; 安藤麻里子; 寺本宗正
  独立行政法人環境再生保全機構, 環境省環境研究総合推進費, 国立環境研究所, 2-2006
• 積雪寒冷地における気候変動の影響評価と適応策に関する研究
  環境研究総合推進費
  Apr. 2020 - Mar. 2023
  野口 泉; 濱原 和広; 芥川 智子; 小野 理; 山口 高志; 鈴木 啓明; 長谷川 祥樹; 鮫島 良次; 平野 高司; 岡田 啓嗣; 井上 聡; 小南 靖弘; 木村 賢人; 大場 真; 戸川 卓哉; 肱岡 靖明
  環境省, 北海道立総合研究機構, JPMEERF20202009
• Towards the Regeneration of Tropical Peatland Societies: Building International Research Network on Paludiculture and Sustainable Peatland Management
  Research Project
  Apr. 2013 - Mar. 2022
  Research Institute for Humanity and Nature, Hokkaido University
• Is Tropical Peatland in SE Asia a huge CH4 source?
  Grants-in-Aid for Scientific Research
  01 Apr. 2018 - 31 Mar. 2021
  伊藤 雅之; 平田 竜一; 平野 高司; 常田 岳志; 坂部 綾香
  インドネシア・中カリマンタン州のサイトにおいては、フラックス観測タワーを用いた生態系スケールのメタンフラックス観測を継続して行っており、気象の年々変動を受けてどのように変動するかについてのデータが蓄積されつつある。新型コロナウィルスの拡大により現地でのデータ回収等が行えなくなったため、カウンターパートとオンライン会議システムを用いることで観測データの回収を継続している。
  入荷が遅れていたレーザーメタン計を用いた現地でのチャンバー法によるメタンフラックス観測の準備を整えた。しかしながら新型コロナウィルスの感染症の拡大により海外渡航し現地調査できない状況となっている。そのため過去に採取した様々な土地利用条件下の熱帯泥炭地の地下水中溶存有機態炭素の量と質の分析及びデータ解析を進めた。インドネシア・スマトラ島のリアウ州（未火災の泥炭地二次林・複数回の火災を受けた焼け跡や後に小規模オイルパーム農園化した泥炭地・アカシアプランテーションから流出する排水路の水・天然泥炭湿地林など）とカリマンタン島の中カリマンタン州（未排水の泥炭湿地然林・排水泥炭林・複数回火災を受けた焼け跡）を含む約250個の試料について、燃焼式吸光光度法によるDOC濃度測定、EEMSによるDOMの蛍光特性分析を行った。クラスター解析及び主成分分析を行ったところ、土地利用ごとに個別のクラスターとして分類され、現在、既に得られている水質データと合わせてデータを検討している。これまでの結果から、火災を受けた泥炭地下水のDOCの性質は未火災の泥炭地のものとは異なることなどが示唆された。
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), University of Hyogo, 18H02238
• Cabon balance over Southeast Asian tropical forests
  Grants-in-Aid for Scientific Research
  01 Apr. 2017 - 31 Mar. 2021
  Kumagai Tomo'omi
  The original plan was to develop the forest inventory network with numerous plots over Southeast Asian tropical forests and conduct synthesized forest carbon balance analyses. However, we did not complete most of the plan because of the worldwide covid situation. Under such a situation, we (1) were successful in arranging some highland mixed forest plots in Vietnam, (2) clarified that the effects of illegal logging are critical in evaluating the total forest carbon balance in Myanmar, (3) suggested twice more total forest carbon stock than the previous estimation via revisiting the total Japanese forest inventory data, and (4) successfully developed an individual-based forest dynamics model, which can be applied for the global-scale simulation.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), The University of Tokyo, 17H01477
• Quantitaive evaluation of the total carbon loss throuhg land conversion from tropical peat swamp forest to an oil plam plantation
  二国間交流事業 オープンパートナーシップ共同研究
  Apr. 2018 - Mar. 2020
  HIRANO Takashi
  JSPS, Principal investigator, Competitive research funding
• 森林の根呼吸を維持呼吸と成長呼吸に分離して評価する
  科学研究費補助金（萌芽）
  Jul. 2017 - Mar. 2020
  平野 高司
  文部科学省, Principal investigator, Competitive research funding
• ボルネオの熱帯泥炭林における炭素動態の広域評価システムの開発
  環境研究総合推進費
  Jun. 2015 - Mar. 2018
  平野 高司
  環境省, Principal investigator, Competitive research funding
• 開発にともなう環境撹乱が熱帯泥炭生態系の泥炭分解に与える影響の評価
  環境研究 近藤次郎グラント
  Apr. 2015 - Mar. 2018
  平野 高司
  旭硝子財団, Principal investigator, Competitive research funding
• Large scale evaluation of decadal forest biomass changes using repeated airborne LiDAR observations in northern Japan
  Grants-in-Aid for Scientific Research
  01 Apr. 2014 - 31 Mar. 2017
  TAKAGI Kentaro; IDE Reiko; HIRAYAMA Kojiro
  We examined the feasibility of estimating forest biomass changes using two airborne LiDAR measurements of forest height acquired 10 yr apart (2004 and 2014) over the Teshio Experimental Forest (225 km2) of Hokkaido University in northern Japan, with 1 ha spatial resolution.
  The average of the decadal net biomass change was 4.18 (±6.64 SD) MgC/ha having large spatial variation. Estimated values were comparable with the results obtained from ground surveys or tower flux observations. Decadal net biomass change was significantly lower at high elevation, north facing slope, steep slope, large tree height variance, and coniferous forest, and significantly higher at south facing slope, deciduous forest, and secondary forest. The photosynthetic biomass increase was linearly correlated with the decadal average of the MODIS NDVI and Green ratio, which implies the application of satellite vegetation indices to further large scale estimation of forest biomass changes
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 26292076
• Refinement of terrestrial carbon budget estimation in Asia through model-data intercomparison
  Grants-in-Aid for Scientific Research
  01 Apr. 2013 - 31 Mar. 2016
  ICHII Kazuhito; KOBAYASHI Hideki; SATO Hisashi; KATO Tomomichi; UEYAMA Masahito; SASAI Takahiro; KONDO Masayuki; WATANABE Akira; ITOH Akihiko; SAIGUSA Nobuko; HIRANO Takashi
  Terrestrial carbon budget in Asia was analyzed using network data of site observation (e.g. AsiaFlux), remote sensing data, and terrestrial ecosystem models. Data-driven terrestrial CO2 fluxes were estimated using AsiaFlux observation and remote sensing data with a machine learning method. The data-driven estimation of CO2 fluxes were further evaluated with outputs from multiple terrestrial biosphere models, and we found consistent interannual variations and gradual increases in CO2 sink in Siberia. We also found large model-data differences in tropical Asia region.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), 25281003
• 北方森林生態系における大規模撹乱後の植生遷移にともなう炭素動態の変化
  科学研究費補助金（基盤研究（A））
  2013 - 2016
  平野 高司
  文部科学省, Principal investigator, Competitive research funding
• タワー観測のネットワーク化による脆弱で巨大な熱帯泥炭炭素の動態解明
  科学研究費補助金（基盤研究（A））
  2013 - 2016
  平野 高司
  文部科学省, Principal investigator, Competitive research funding
• 土地利用変化が熱帯泥炭の分解にともなう二酸化炭素排出に与える影響の評価
  環境研究助成
  Nov. 2014 - Nov. 2015
  平野 高司
  住友財団, Principal investigator, Competitive research funding
• 東アジア陸域生態系における炭素動態の定量化のための日中韓研究ネットワークの構築
  日中韓フォーサイト事業
  Aug. 2007 - Jul. 2012
  平野 高司
  日本学術振興会, Principal investigator, Competitive research funding
• Control and analysis for formation of water environment using spatial information
  Grants-in-Aid for Scientific Research(基盤研究(A))
  2008 - 2012
  Noboru NOGUCHI; 平野 高司; 波多野 隆介; 山田 浩之; 石井 一暢; 海津 裕
  (抄録なし)
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(A), 北海道大学, Coinvestigator not use grants, Competitive research funding, 20248027
• Investigation interaction processes between the atmosphere and forest ecosystems in Southeast Asia using a tower flux network
  Grants-in-Aid for Scientific Research
  2009 - 2011
  HIRANO Takashi; KONDO Hiroaki; MAEDA Takahisa; KOSUGI Yoshiko; TAKANASHI Satoru; TANAKA Nobuaki; TAMAI Koji; KUMAGAI Tomoomi; SAIGUSA Nobuko
  We have continuously measured fluxes of CO2 and water vapor above 11 tropical forests in Southeast Asia. Using the long-term monitoring data, gas exchange processes (photosynthesis, respiration and evapotranspiration) were examined. As a result, factors controlling the gas exchange processes were determined, and the effect of a precipitationpattern on the gas exchange processes was elucidated.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, Principal investigator, Competitive research funding, 21255001
• Carbon balance of a peatland ecosystem under the changing environment
  Grants-in-Aid for Scientific Research
  2008 - 2010
  HIRANO Takashi; HATANO Ryusuke; INOUE Takashi; FUJITA Hiroko; YAMADA Hiroyuki; TAKADA Masayuki
  We compared evapotranspiration and carbon balance between areas dominated by sphagnum species and vascular plats,"sasa" using flux monitoring data. Evapotranspiration during the snow-free season was higher at the sphagnum area than the sasa area, which does not support a hypothesis that the invasion of sasa plants with root systems dries the Sarobetsu Mire. The carbon balance during the snow-free season shows that both the ecosystems functioned as net CO_2 sinks to the atmosphere. In 2010, which had a very hot summer, net CO_2 uptake increased in the sphagnum area, whereas it decreased in the sasa area mainly because of increased ecosystem respiration due to high temperature.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, Principal investigator, Competitive research funding, 20241002
• Optimization of tropical peatland management based on carbon flow control
  Grants-in-Aid for Scientific Research(基盤研究(A))
  2007 - 2010
  Takashi INOUE; 大崎 満; 橋床 泰之; 俵谷 圭太郎; 原口 昭; Ryusuke HATANO; Takashi HIRANO; Hiroshi TANI; Hideyuki SAITOU; Yutaka TAMAI; Mitsuru OSAKI; Hiroshi HATA; Yasuyuki HASHIDOKO; Yasumitsu URAKI; Keitaro TAWARAYA; Akira HARAGUCHI; Ryuichiro ABE
  Tropical peat land is a huge carbon sink involving an ecosystem that is very fragile but rich in biodiversity. This study deployed on establishment of measures for optimum land use and land management based on the viewpoint of control of carbon flow in tropical peatland. Prevention of peat fire, restoration of devastated land, sustainable bioproduction, and the reduction of environment load are the special interest that is rendered for the approach.
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(A), 北海道大学, Coinvestigator not use grants, Competitive research funding, 19255016
• Assessment of the reduction of carbon dioxide emission from tropicalpeatlands through environmental restoration
  Grants-in-Aid for Scientific Research(基盤研究(B))
  2006 - 2008
  Takashi HIRANO; 谷 宏; 井上 京; 島田 沢彦; 山田 浩之
  東南アジアの低平地に分布する熱帯泥炭地は膨大な量の土壌炭素を貯留しているが, 開発による地下水位の低下などにより, 大量のCO_2を大気に放出する危険性が高まっている。そのため, CO_2排出量を抑制するために, 排水路を堰上げする簡易ダムによる環境修復が実施されている。本研究では, 生態系と大気との間のCO_2交換量をモニタリングし, ダムによる環境修復が熱帯泥炭の好気的分解を抑制し, CO_2排出量を低減させることを実証した。また, 衛星リモートセンシングを利用した地下水位の広域評価の可能性を示した。
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(B), 北海道大学, Principal investigator, Competitive research funding, 18403001
• Effects of typhoon damage on the carbon dynamics of a larch forest
  Grants-in-Aid for Scientific Research(基盤研究(B))
  2005 - 2007
  Takashi HIRANO; 藤沼 康実; 小熊 宏之; 梁 乃申; 犬飼 孔
  A plantation (42°44'N, 141°31'E) of Japanese larch (Larix kaempferi Sarg.) in Tomakomai, Hokkaido, Japan was destroyed by Typhoon Songda in September 2004. About 90% trees were blown down by strong wind. In this study, we compared vegetation properties, biomass and net ecosystem CO_2 uptake (NEP) before and after the typhoon damage. Before the typhoon damage, this forest was a 45-year-old plantation of Japanese larch with some broad-leaved trees. The canopy height was 15 m and the maximum leaf area index (LAI) was 5.6m^2 m^<-2>. After the typhoon, all stems of larch trees were removed from ...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(B), 北海道大学, Principal investigator, Competitive research funding, 17310017
• Proton transfer reaction mass spectrometry based measurement of toxic organic gas uptake by plant
  Grants-in-Aid for Scientific Research(基盤研究(B))
  2004 - 2006
  Akira TANI; 高山 真策; 平野 高司; 小池 真
  In order to evaluate the contribution that higher plants make to the removal of volatile organic compounds from the atmosphere, a measurement system consisting of a proton transfer reaction mass spectrometer (PTR-MS), CO2 analyzer, diffusion devise and leaf enclosure was established. Methacrolein (MACR), methyl vinyl ketone (MVK), croton aldehyde (CA), methyl ethyl ketone (MEK) and methylisobuthylketone (MIBK) were fumigated. The uptake of VOCs by Epipremnum aureum, Quercus acutissima, Q. myrsinaefolia and Q. phillyraeoides was investigated.The overall error associated with measurements mad...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(B), 東海大学, Coinvestigator not use grants, Competitive research funding, 16310014
• Study on Interaction between Global Warming and Permafrost Thawing
  Grants-in-Aid for Scientific Research(基盤研究(S))
  2002 - 2006
  Masami FUKUDA; 平野 高司; 町村 尚
  In the Mid of Siberian Taiga, long term field measurements at disturbed and control sites on Carbon budget, heat and mass transfers were conducted. As to investigation, two observation towers were installed. Before disturbance intact Taiga forest absorbed carbon dioxide by 86mg/m^2.day, but after disturbance carbon dioxide was emitted from the ground by 140 mg/m2.day due to the loss of vegetation and increase of soil respiration. Loss of surface vegetation resulted in the increase of flux heat to the ground by 20% and it caused the large scale thawing of upper permafrost. The long term file...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(S), 北海道大学, Coinvestigator not use grants, Competitive research funding, 14102008
• Effects of large-scale environmental disturbances through land-use change and fires on the CO2 balance of tropical peat swamp forest
  Grants-in-Aid for Scientific Research(基盤研究(A))
  2003 - 2005
  Takashi HIRANO; 高橋 英紀; 大崎 満; 谷 宏; 井上 京; 岡田 啓嗣; 兒玉 裕二
  Tropical peatlands, which coexist with swamp forests, have accumulated vast amounts of carbon as soil organic matter. Since the 1970s, however, deforestation and drainage have progressed on an enormous scale. In addition, El Nino and Southern Oscillation (ENSO) drought and large-scale fires, which grow larger under the drought condition, are accelerating peatland devastation. That devastation enhances decomposition of soil organic matter and increases the carbon release to the atmosphere as CO_2. This phenomenon suggests that tropical peatlands have already become a large CO_2 source, but r...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(A), 北海道大学, Principal investigator, Competitive research funding, 15255001
• Study on development of agricultural system model on a large scale
  Grants-in-Aid for Scientific Research(基盤研究(B))
  2003 - 2004
  Hiroshi TANI; 平野 高司; 王 秀峰; 矢沢 正士; 鮫島 良次
  Monitoring crop condition and production estimates on a large scale is important for food supply. The objectives of the study are (1)mapping meteorological values by use of Geostationary Meteorological Satellite data for solar radiation and by routine observation data for meteorological grid data on daily and hourly basis, (2)simulating crop growth by coupling of crop growth model and estimation model for meteorological data, (3)applying estimation technique for meteorological variables by satellite data to a foreign country, and (4)monitoring environmental information for agricultural prod...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(B), 北海道大学, Coinvestigator not use grants, Competitive research funding, 15380178
• Evaluation and modeling of CO_2 exchange process between the atmosphere and a northern forest ecosystem
  Grants-in-Aid for Scientific Research(基盤研究(B))
  2001 - 2004
  Takashi HIRAO; 町村 尚; 鱧谷 憲; 文字 信貴; 岡田 啓嗣; 高木 健太郎
  An extremely important objective of long-term observations of CO_2 flux is to improve the understanding of climatic effects on the CO_2 exchange process between terrestrial ecosystems and the atmosphere for predicting net CO_2 ecosystem exchange (NEE). Nevertheless, reports that address NEE remain limited for Asian ecosystems. This paper reports the three-year measurement of NEE over a manmade Japanese larch forest in northern Japan, which is one of the most important forests for forestry in this area, using an eddy covariance technique with an open-path system from 2001 to 2003. Difference...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(B), 北海道大学, Principal investigator, Competitive research funding, 13480150
• Analysis and management of environmental loads caused by large scale disturbance in peatland of Southeast Asia
  Grants-in-Aid for Scientific Research(基盤研究(A))
  2001 - 2004
  Mitsuru OSAKI; 蒲生 稔; 平野 高司; 井上 京; 甲山 隆司; 松原 健司
  Huge amount of tropical peat distribute in Kalimantan, Indonesia, which face a crisis of decomposition by frequent fire because of unruly development and irregular logging. As CO_2 by fire and microorganisms are tremendously, it is observed CO_2 increase in atmosphere clearly. Therfore, we have studied here to rehabilitate forestry and to conserve peat soil in devastated peat land. Obtained results are as follows.(1)Estimation of environmental values1)Dynamics of chemical compounds and lignin degradationDynamics of chemical compounds was estimated in peat soil, river, and lake, for which ma...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(A), 北海道大学, Coinvestigator not use grants, Competitive research funding, 13375011
• 冬期積雪条件における森林土壌からのCO2発生量の評価
  環境研究助成
  2003 - 2003
  平野 高司
  住友財団, Principal investigator, Competitive research funding
• Development of a long-term methane flux measurement system with REA method
  Grants-in-Aid for Scientific Research(基盤研究(C))
  2002 - 2003
  Ken HAMATANI; 文字 信貴; 平野 高司
  We developed a long-term methane flux measurement system with REA method and conducted a continuous observation in forests. The system operates automatically to make flux measurements with micro-computer. We developed the hardware of sampling system and processing parts and software for the long-term continuous estimation. We adopted a methane analyzer with FID detector. Although the accuracy of the analyzer is 50ppb, REA system requires relative concentration differences of two sampled air which this analyzer can detect down to several ppb.Before we carried out the methane flux measurement...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(C), 大阪府立大学, Coinvestigator not use grants, Competitive research funding, 14560218
• The characteristics of heat, water, CO_2 and chemical cycles in permafrost regions in Inertia Alaska.
  Grants-in-Aid for Scientific Research(基盤研究(B))
  2001 - 2003
  Nobuyoshi ISHIKAWA; 平野 高司; 石井 吉之; 兒玉 裕二; 知北 和久; 浦野 慎一
  For understanding the heat, water and carbon cycles of high latitudes, meteorological and hydrological researches have been carried out at the experimental watershed in Interior Alaska from 2001 to 2004. Observed items were radiation, sensible heat, evapo-transpiration, CO_2 concentration above vegetation floor, soil respiration, soil moisture, soil temperature, runoff and chemical contents of river water, groundwater and precipitation. Underground structure was obtained by geophysical exploration and confirmed by well borings at three different points in the watershed.The main observationa...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(B), 北海道大学, Coinvestigator not use grants, Competitive research funding, 13573015
• Effects of climatic conditions on morphology, hydrochemical conditions, and plant species composition of Sphagnum hummocks
  Grants-in-Aid for Scientific Research(基盤研究(C))
  2000 - 2002
  Kazuo YABE; 平野 高司; 倉持 寛太; 浦野 慎一; 植村 滋
  In order to clarify the reasons of regional differences in shape and size of Sphagnum hummocks throughout Hokkaido, we examined the growth of 3 Sphagnum species growing on hummocks in 4 mires, with controlling the conditions of snow pressure and shading by other plants. Fuhrengawa has cylindrical and extremely raised type, Sarobetsu and Utasai have flat and low type. Utonai has conical and middle height type, The annual growth was larger in Sarobetu and Utasai. Remarkable suppression of the growth of S. papillosum at Sarobetu was observed in June, where hummock surface was desiccated owing ...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(C), 札幌市立高等専門学校, Coinvestigator not use grants, Competitive research funding, 12680584
• The effects of forest and snow cover on the water and chemical cycles in cold snowy watersheds
  Grants-in-Aid for Scientific Research(基盤研究(B))
  1999 - 2002
  Nobuyoshi ISHIKAWA; 兒玉 裕二; 田中 夕美子; 石井 吉之; 平野 高司; 高橋 英紀; 兒玉 裕二; 田中 夕美子
  For understanding the effects of forest and snow cover on the water, CO_2 and chemical cycles were examined at two different experimental watersheds from 1999 to 2003 including three snow cover seasons. One watershed located at the northern part of Hokkaido where the annual temperature range was -30℃ to 25℃ and the maximum snow depth was more than 2m. The other was at the southern part of Hokkaido, where the temperature range was -25℃ to 25℃ and the snow depth was below 50cm. Vegetations of both sites are mixed forests of evergreen needle leaf trees and deciduous broad-leaved trees with bam...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(B), 北海道大学, Coinvestigator not use grants, Competitive research funding, 11490001
• 熱帯泥炭林の消失にともなう環境劣化機構に関する研究
  環境研究助成
  2001 - 2001
  平野 高司
  昭和シェル石油, Principal investigator, Competitive research funding
• 北方森林土壌におけるCO2の動態と発生量に関する研究
  研究助成
  2001 - 2001
  平野 高司
  アサヒビール学術振興財団, Principal investigator, Competitive research funding
• 土壌からのCO_2放出速度の長期連続測定方法の開発
  科学研究費補助金(萌芽的研究)
  2000 - 2001
  平野 高司
  土壌のCO_2濃度,土壌表面からのCO_2放出速度(土壌呼吸速度),および土壌の層別CO_2発生速度を長期・連続測定(モニタリング)する手法を開発し,森林において実証試験を行った(現在も継続中)。開発した手法は,小型の赤外線CO_2分析計を土壌の数深度に埋め込み,土壌CO_2濃度を連続測定し,得られたCO_2の濃度勾配,土壌のCO_2拡散係数,および土壌層でのCO_2貯留変化量を用いて,土壌中のCO_2の輸送速度(フラックス),土壌呼吸速度,CO_2発生速度を連続的に定量評価するものである。現地実験は,北海道大学苫小牧研究林の落葉広葉樹林において,1999年5月から,また隣接する苫小牧国有林のカラマツ林において2001年6月から連続して行っており,現在も継続中である。現地実験の結果,本研究で考案したシステムにより,土壌CO_2濃度および土壌呼吸速度を長期にわたり連続測定できることが実証された。土壌のCO_2濃度を,このような長期にわたって連続測定した例は過去にない。なお,2年間以上にわたる現地実験を通して得られた主要な結果は,1)土壌のCO_2濃度は,基本的には地温の変化にともなって日変化および季節変化するが,降雨にともなう土壌水分の変化にも影響を受ける,2)土壌呼吸速度は,地温の上昇にともなって指数関数的に増大し,7〜9月に最大となった,3)2000年6〜11月の無積雪期の...
  文部科学省, 萌芽的研究, 北海道大学, Principal investigator, Competitive research funding, 12878089
• Evaluation of the function of woody plants for environmental control under elevated atmospheric CO_2
  Grants-in-Aid for Scientific Research(基盤研究(B))
  1997 - 2000
  Makoto KIYOTA; 平野 高司; 北宅 善昭; 渋谷 俊夫
  This study investigated the changes in CO_2 and H_2O gas exchange of woody plants due to increases in CO_2 concentrations. This report contains information obtained from the study on gas exchange of woody plants in ambient and elevated CO_2 concentrations :(1) effects of CO_2 concentration and light intensity on photosynthesis and transpiration rate of young trees,(2) inhibition of water stress in evergreen trees under elevated CO_2 concentration,(3) effects of elevated CO_2 concentration on heat balance and transpiration of tree seedlings,(4) method for measurement of sorption rates of gas...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(B), 大阪府立大学, Coinvestigator not use grants, Competitive research funding, 09460119
• Influences of Heat Storage and Lake Effect in Inland Waters on Regional Bioproduction.
  Grants-in-Aid for Scientific Research(基盤研究(B))
  1997 - 1999
  Shinichi URANO; 堀口 郁夫; 山梨 光訓; 町村 尚; 上田 宏; 高橋 英紀; 平野 高司
  In order to study the relationship between landwater and bioproduction, the heat storage and lake effect in Lake Toya, and the characteristics of hydro-meteorology in Zanbeji river flood plain, Zambia, were invesitigated. The results are summarized as follows;In Lake Toya, because of large heat storage in the lake, there was the phase difference of about 6 months between land and water surfaces in the change of effective energy. Such phase difference has coursed the lake effect. The lake effects in Lake Toya were strongly generated in summer than in winter because the cold air on the water ...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(B), 北海道大学, Coinvestigator not use grants, Competitive research funding, 09460117
• Fundamental Study on Control of Atmospheric Environment by Vegetation
  Grants-in-Aid for Scientific Research(一般研究(C))
  1994 - 1995
  Takashi HIRANO; 清田 信
  NO and NO2 fluxes were measured micrometeorologically from Oct.to Dec.in 1994 above vegetation and from Jul.to Oct.in 1995 above vegetation and bare soil. The experimental sites were a lawn (Zoysia matrella Merr.) trimmed to 1 cm (average LAI 4,2) and uncultivated bare soil, in Osaka Prefecture University. The fluxes were determined using a gradient method, together with those of CO2 and water vapor. Data for calculation were obtained near the surfaces, at heights of 2 and 8 cm. NO and NO2 concentration of the air sampled in shaded Teflon bags was determined with a chemiluminescent analyzer...
  Ministry of Education, Culture, Sports, Science and Technology, 一般研究(C), 大阪府立大学, Principal investigator, Competitive research funding, 06660326
• Growth Control of Plants by Changing the Spectral Distribution of Optical Radiant Environment
  Grants-in-Aid for Scientific Research(試験研究(B))
  1993 - 1995
  Ichiro AIGA; 洞口 公俊; 谷 晃; 村上 克介; 平野 高司; 清田 信
  This study had started after the success of our former project concerning the growth control of plants by additional far-red (FR) irradiation and 4-band fluorescent lamp for plant growth which has more FR irradiation than normal fluorescent lamp. Our aim in this research was as follows :(I) To get an efficient plant growth control method by modifying the spectral characteristics of 4-band fluorescent lamp.(2) Development of covering materials for greenhouses to control plant growth by changing the spectral distribution of daylight.(3) High speed measurements of spectral characteristics conc...
  Ministry of Education, Culture, Sports, Science and Technology, 試験研究(B), 大阪府立大学, Coinvestigator not use grants, Competitive research funding, 05556046
• 渦集積法の実用化とそれによる森林内微量気体の乱流輸送の研究
  科学研究費補助金(一般研究(C))
  1994 - 1994
  文字 信貴; 鱧谷 憲; 平野 高司
  増え続ける温室効果気体が地球の気候環境を変えることが懸念されているが,大気の微量気体がどの程度の量,どの様なメカニズムで,さまざまな地表から出ているか,あるいは植生などによって吸収されているが明確にされていないことは気候変化の予測を困難にする一因となっている.これは,微量気体の動態の測定技術が未開発であることが原因である.微量気体の交換過程は大気乱流の混合がその役割を果たす.したがって,微量気体濃度の乱流変動をさまざまな植被上などではかる必要があるが,現在の技術では分析器の応答性,安定性に限界がある.この点を解決する方法として提案されたのが渦集積法である.渦集積法は気流が上向きの成分と下向きの成分を持つ場合にわけてそれぞれ空気を別々にその成分の大きさに比例して容器に収集し,それぞれの濃度を計測する方法である.しかし,誤差が大きいため,条件を緩和して空気の収納を定速で行う簡易渦集積法が提案されている.本研究ではその方法を実用化するためにサンプリング装置を開発し,森林で試験観測を実施した.観測は滋賀県南部の針葉樹林で行った.この簡易渦集積法では係数を実験によって決定しなければならない.そのために,すでに乱流変動の測定が可能な赤外線の二酸化炭素変動計をもちいて直接的な渦相関法により二酸化炭素のフラックスを求め,その一方でサンプルした二つの容器の二酸化炭素濃度は購入した赤外線分析計を...
  文部科学省, 一般研究(C), 大阪府立大学, Coinvestigator not use grants, Competitive research funding, 06660325
• 緑化樹のNO_2吸収機能および温湿度環境緩和機能に関する基礎的研究
  科学研究費補助金(奨励研究(A))
  1993 - 1993
  平野 高司
  本研究では、緑化樹の大気浄化(NO_2吸収)機能と温湿度環境緩和機能を評価するための基礎的な実験データを得ることを目的として、いくつかの条件で植物のNO_2吸収速度、蒸散速度、光合成速度および葉温を同時測定し、それらの相互関係を調べた。実験は現有の人工光型グロースチャンバー内に設置した開放系のガス交換測定システム(同化箱法)を用いて行い、ガス濃度差などの出力データは設備備品として購入したパソコンを用いてガス交換速度に変換した。システムへのNO_2の吸着ができるだけ少なくなるように、配管にはステンレス、あるいはテフロン製のものを用い、また同化箱の壁面をテフロンシートで被覆したが、吸着量は温度条件などにより変化した。そのため、まず植物を入れる前の段階でシステムへのNO_2吸着量に与える測定条件の影響を調べ、測定値を補正する方法を検討した。植物材料には鉢植えのポプラのクローン苗(系統:I-214)を用いた。土壌水分が十分、大気の飽差が一定の条件で気温とひかり強度を変化させて実験を行った結果、NO_2吸収速度、蒸散速度、光合成速度は同様に変化し、気温15〜35℃で光強度500mumolm^<-2>s^<-1>(PPFD)以下では、それぞれのガス交換速度間の関係はほぼ直線となった。これらの関係は、気孔コンダクタンスによって説明できることが認められた。現在、大気湿度を変化させて同様の実験...
  文部科学省, 奨励研究(A), 大阪府立大学, Principal investigator, Competitive research funding, 05760198
• Freshness retention in controlled-atmosphere-stored tropical fruits
  Grants-in-Aid for Scientific Research(一般研究(C))
  1991 - 1993
  Makoto KIYOTA; 平野 高司
  The respiration and transpiration rates of many tropical fruits are generally higher than those of other fruits, therefore, the tropical fruits often occur external injury and incidence of decay. This study was aimed at establishing some useful retention method and assessing the quality and storability of tropical fruits in air and CA storage.Papaya (Carica papaya L.), avocado (Persea americana Mill.), banana (Musa paradisiaca L.), and mango (Mangifera indica L.) were evaluated for external appearance, flesh firmness, and internal quality.Storage of several fresh fruits in controlled atmosp...
  Ministry of Education, Culture, Sports, Science and Technology, 一般研究(C), 大阪府立大学, Coinvestigator not use grants, Competitive research funding, 03660270
• Monitaring of environmental functions of terrestrial ecosystems
  Competitive research funding