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Nakaji Tatsuro

Field Science Center for Northern Biosphere　Forest Research Station　Southern Forestry Research and Development OfficeProfessor

現在、北大苫小牧研究林にてリモートセンシング技術（分光反射計測）を使って樹木の生理生態的な環境応答の検出研究を進めています。また、北海道からマレーシアまで幅広い気候帯の森林でフィールドワークをしながら、樹木の葉の構造や化学成分の非破壊検出法の開発にも取り組んでいます。
他にも、分光計測を応用した根圏の動態や炭素フローの推定など、日々、新しい研究に意欲的に挑戦しています。興味のある方はご連絡を。

Researcher basic information

■ Degree
  • 博士（農学）, 東京農工大学
■ URL
researchmap URLホームページURL■ Various IDs
Researcher number
  • 40391130
J-Global ID■ Research Keywords and Fields
Research Keyword
  • リモートセンシング
  • 生理生態機能
  • 森林
  • Ecophysiology
  • Forest
  • Remote Sensing
Research Field
  • Life Science, Plant molecular biology and physiology
  • Life Science, Ecology and environment
  • Environmental Science/Agriculture Science, Environmental policy and social systems
  • Environmental Science/Agriculture Science, Environmental impact assessment
■ Educational Organization

Career

■ Career
Career
  • Dec. 2023 - Present
    大学院環境科学院, 教授
  • Dec. 2023 - Present
    Hokkaido University, 北方生物圏フィールド科学センター, Professor, 札幌研究林長
Educational Background
  • 2002, Tokyo University of Agriculture and Technology, 連合農学研究科, Japan

Research activity information

■ Papers
  • Characterizing typhoon-disturbed biomass dynamics using multitemporal LiDAR, high-resolution imagery, and deep learning in cool-temperate forest, northern Japan
    Ang Li; Tomomichi Kato; Hantao Li; Long Duc Nguyen; Masato Hayashi; Ram Avtar; Tatsuro Nakaji
    Forest Ecology and Management, 610, 123692, 123692, Elsevier BV, Jun. 2026
    Scientific journal
  • Responses of growth and root dynamics to soil compaction stress in Japanese larch ( Larix kaempferi ) seedlings
    Izuki Endo; Shota Tone; Jun’ichiro Ide; Xingyi Zhao; Mizue Ohashi; Tatsuro Nakaji
    Journal of Forest Research, 1, 9, Informa UK Limited, 15 Dec. 2025
    Scientific journal
  • Winter leaf reddening and photoprotection accessed by vegetation indices and its influence on canopy light-use efficiency of a Japanese cypress (Chamaecyparis obtusa) forest
    Siyu Chen; Yoshiko Kosugi; Linjie Jiao; Ayaka Sakabe; Daniel Epron; Tatsuro Nakaji; Hibiki Noda; Kouki Hikosaka; Kenlo Nishida Nasahara
    Agricultural and Forest Meteorology, 363, 110427, 110427, Elsevier BV, Mar. 2025
    Scientific journal
  • High-resolution digital canopy height models, terrain models, ortho-mosaic photos, and canopy tree crown shapes derived from UAV-borne LiDAR at 22 tree census plots across Japanese natural forests
    Ryuichi Takeshige; Kyaw Kyaw Htoo; Masanori Onishi; Farhadur Md. Rahman; Kazuhiko Hoshizaki; Hideyuki Ida; Masae Iwamoto Ishihara; Akira Itoh; Takayuki Kaneko; Ayumi Katayama; Shigeo Kuramoto; Hiroko Kurokawa; Masayuki Maki; Kazuhiko Masaka; Tatsuro Nakaji; Masahiro Nakamura; Naoyuki Nishimura; Mahoko Noguchi; Atsushi Sakai; Atsushi Takashima; Naoaki Tashiro; Naoko Tokuchi; Hiromi Yamagawa; Yusuke Onoda
    Ecological Research, Mar. 2025
    English, Scientific journal
  • 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; Trofim Maximov; Ryo Moriwaki; Hiroyuki Muraoka; Roman Petrov; Jun Suzuki; Shingo Taniguchi; Kazuhito Ichii
    Earth System Science Data, Copernicus GmbH, 12 Feb. 2025
    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 country branch of AsiaFlux. Despite the growing number 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 dataset consists of data collected at 79 sites with 652 site-years from 1990 to 2023. The data format is fully compatible with the recent FLUXNET data product, FLUXNET2015. 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.
  • Tree Species Classification by Multi-Season Collected UAV Imagery in a Mixed Cool-Temperate Mountain Forest
    Ram Avtar; Xinyu Chen; Jinjin Fu; Saleh Alsulamy; Hitesh Supe; Yunus Ali Pulpadan; Albertus Stephanus Louw; Nakaji Tatsuro
    Remote Sensing, 16, 21, 4060, 4060, MDPI AG, 31 Oct. 2024
    Scientific journal, Effective forest management necessitates spatially explicit information about tree species composition. This information supports the safeguarding of native species, sustainable timber harvesting practices, precise mapping of wildlife habitats, and identification of invasive species. Tree species identification and geo-location by machine learning classification of UAV aerial imagery offer an alternative to tedious ground surveys. However, the timing (season) of the aerial surveys, input variables considered for classification, and the model type affect the classification accuracy. This work evaluates how the seasons and input variables considered in the species classification model affect the accuracy of species classification in a temperate broadleaf and mixed forest. Among the considered models, a Random Forest (RF) classifier demonstrated the highest performance, attaining an overall accuracy of 83.98% and a kappa coefficient of 0.80. Simultaneously using input data from summer, winter, autumn, and spring seasons improved tree species classification accuracy by 14–18% from classifications made using only single-season input data. Models that included vegetation indices, image texture, and elevation data obtained the highest accuracy. These results strengthen the case for using multi-seasonal data for species classification in temperate broadleaf and mixed forests since seasonal differences in the characteristics of species (e.g., leaf color, canopy structure) improve the ability to discern species.
  • Indirect effects of soil warming on litter decomposition via changes in litter quality of dominant tree species in three cool-temperate forests
    Miki U. Ueda; Masahiro Nakamura; Tatsuro Nakaji; Kobayashi Makoto; Tsutom Hiura
    Plant and Soil, Springer Science and Business Media LLC, 19 Oct. 2024
    Scientific journal
  • Insectivorous birds and bats outperform ants in the top‐down regulation of arthropods across strata of a Japanese temperate forest
    Elise Sivault; Jan Kollross; Leonardo Re Jorge; Sam Finnie; David Diez‐Méndez; Sara Fernandez Garzon; Heveakore Maraia; Jan Lenc; Martin Libra; Masashi Murakami; Tatsuro Nakaji; Masahiro Nakamura; Rachakonda Sreekar; Legi Sam; Tomokazu Abe; Matthias Weiss; Katerina Sam
    Journal of Animal Ecology, Wiley, 24 Jul. 2024
    Scientific journal, Abstract

    Birds, bats and ants are recognised as significant arthropod predators. However, empirical studies reveal inconsistent trends in their relative roles in top‐down control across strata. Here, we describe the differences between forest strata in the separate effects of birds, bats and ants on arthropod densities and their cascading effects on plant damage.

    We implemented a factorial design to exclude vertebrates and ants in both the canopy and understorey. Additionally, we separately excluded birds and bats from the understorey using diurnal and nocturnal exclosures. At the end of the experiments, we collected all arthropods and assessed herbivory damage.

    Arthropods responded similarly to predator exclusion across forest strata, with a density increase of 81% on trees without vertebrates and 53% without both vertebrates and ants. Additionally, bird exclusion alone led to an 89% increase in arthropod density, while bat exclusion resulted in a 63% increase. Herbivory increased by 42% when vertebrates were excluded and by 35% when both vertebrates and ants were excluded. Bird exclusion alone increased herbivory damage by 28%, while the exclusion of bats showed a detectable but non‐significant increase (by 22%). In contrast, ant exclusion had no significant effect on arthropod density or herbivory damage across strata.

    Our results reveal that the effects of birds and bats on arthropod density and herbivory damage are similar between the forest canopy and understorey in this temperate forest. In addition, ants were not found to be significant predators in our system. Furthermore, birds, bats and ants appeared to exhibit antagonistic relationships in influencing arthropod density. These findings highlight, unprecedentedly, the equal importance of birds and bats in maintaining ecological balance across different strata of a temperate forest.
  • Unveiling the transferability of PLSR models for leaf trait estimation: lessons from a comprehensive analysis with a novel global dataset
    Fujiang Ji; Fa Li; Dalei Hao; Alexey N. Shiklomanov; Xi Yang; Philip A. Townsend; Hamid Dashti; Tatsuro Nakaji; Kyle R. Kovach; Haoran Liu; Meng Luo; Min Chen
    New Phytologist, 243, 1, 111, 131, Wiley, 06 May 2024
    Scientific journal, Summary

    Leaf traits are essential for understanding many physiological and ecological processes. Partial least squares regression (PLSR) models with leaf spectroscopy are widely applied for trait estimation, but their transferability across space, time, and plant functional types (PFTs) remains unclear.

    We compiled a novel dataset of paired leaf traits and spectra, with 47 393 records for > 700 species and eight PFTs at 101 globally distributed locations across multiple seasons. Using this dataset, we conducted an unprecedented comprehensive analysis to assess the transferability of PLSR models in estimating leaf traits.

    While PLSR models demonstrate commendable performance in predicting chlorophyll content, carotenoid, leaf water, and leaf mass per area prediction within their training data space, their efficacy diminishes when extrapolating to new contexts. Specifically, extrapolating to locations, seasons, and PFTs beyond the training data leads to reduced R2 (0.12–0.49, 0.15–0.42, and 0.25–0.56) and increased NRMSE (3.58–18.24%, 6.27–11.55%, and 7.0–33.12%) compared with nonspatial random cross‐validation. The results underscore the importance of incorporating greater spectral diversity in model training to boost its transferability.

    These findings highlight potential errors in estimating leaf traits across large spatial domains, diverse PFTs, and time due to biased validation schemes, and provide guidance for future field sampling strategies and remote sensing applications.
  • Segmenting Growing and Dying Woody Roots in a Forest Using Deep Learning-Based Software.
    Takuto Yamagata; Hidetoshi Ikeno; Toshihumi Kimura; Teijiro Isokawa; Tatsuro Nakaji; Kensuke Mori; Tomonori Kume; Mizue Ohashi
    TENCON, 535, 538, 2024
    International conference proceedings
  • Belowground spectroscopy — Novel spectral approach for estimation of vertical and species-specific distributions of forest soil characteristics and heterotrophic respiration
    Tatsuro Nakaji; Naoki Makita; Ayumi Katayama; Hiroyuki Oguma
    Agricultural and Forest Meteorology, 339, 109563, 109563, Elsevier BV, Aug. 2023, [Peer-reviewed]
    English, Scientific journal
  • Modeling forest above-ground biomass using freely available satellite and multisource datasets
    Ai Hojo; Ram Avtar; Tatsuro Nakaji; Takeo Tadono; Kentaro Takagi
    Ecological Informatics, 74, 101973, 101973, Elsevier BV, May 2023
    Scientific journal
  • Accuracy Assessment of Photochemical Reflectance Index (PRI) and Chlorophyll Carotenoid Index (CCI) Derived from GCOM-C/SGLI with In Situ Data
    Taiga Sasagawa; Tomoko Kawaguchi Akitsu; Reiko Ide; Kentaro Takagi; Satoru Takanashi; Tatsuro Nakaji; Kenlo Nishida Nasahara
    Remote Sensing, 14, 21, 5352, 5352, 26 Oct. 2022
    English, Scientific journal
  • Evaluating the soil microbe community‐level physiological profile using EcoPlate and soil properties at 33 forest sites across Japan
    Masahiro Nakamura; Chisato Terada; Kinya Ito; Kazuaki Matsui; Shigeru Niwa; Masae Ishihara; Tanaka Kenta; Tetsuro Yoshikawa; Taku Kadoya; Tsutom Hiura; Hiroyuki Muraoka; Ken Ishida; Naoki Agetsuma; Ryosuke Nakamura; Hitoshi Sakio; Masahiro Takagi; Akira S. Mori; Megumi K. Kimura; Hiroko Kurokawa; Tsutomu Enoki; Tatsuyuki Seino; Atsushi Takashima; Hajime Kobayashi; Kazuho Matsumoto; Koichi Takahashi; Ryunosuke Tateno; Tomohiro Yoshida; Tatsuro Nakaji; Masayuki Maki; Kazutaka Kobayashi; Karibu Fukuzawa; Kazuhiko Hoshizaki; Kazuhide Ohta; Keito Kobayashi; Motohiro Hasegawa; Satoshi N. Suzuki; Michinori Sakimoto; Yoichiro Kitagawa; Akiko Sakai; Hirofumi Kondo; Tomoaki Ichie; Koji Kageyama; Ayaka Hieno; Shogo Kato; Tatsuya Otani; Yasuhiro Utsumi; Tomonori Kume; Kosuke Homma; Koju Kishimoto; Kazuhiko Masaka; Kenta Watanabe; Motomu Toda; Dai Nagamatsu; Yuko Miyazaki; Tamon Yamashita; Naoko Tokuchi
    Ecological Research, 37, 3, 432, 445, Wiley, Feb. 2022
    Scientific journal
  • Anatomical patterns of condensed tannin in fine roots of tree species from a cool-temperate forest
    Izuki Endo; Miwa Kobatake; Natsuko Tanikawa; Tatsuro Nakaji; Mizue Ohashi; Naoki Makita
    Annals of Botany, 128, 1, 59, 71, Oxford University Press (OUP), 28 Jul. 2021, [Peer-reviewed], [International Magazine]
    English, Scientific journal, Abstract

    Background and Aims
    Condensed tannin (CT) is an important compound in plant biological structural defence and for tolerance of herbivory and environmental stress. However, little is known of the role and location of CT within the fine roots of woody plants. To understand the role of CT in fine roots across diverse species of woody dicot, we evaluated the localization of CT that accumulated in root tissue, and examined its relationships with the stele and cortex tissue in cross-sections of roots in 20 tree species forming different microbial symbiotic groups (ectomycorrhiza and arbuscular mycorrhiza).




    Methods
    In a cool-temperate forest in Japan, cross-sections of sampled roots in different branching order classes, namely, first order, second to third order, fourth order, and higher than fourth order (higher order), were measured in terms of the length-based ratios of stele diameter and cortex thickness to root diameter. All root samples were then stained with ρ-dimethylaminocinnamaldehyde solution and we determined the ratio of localized CT accumulation area to the root cross-section area (CT ratio).




    Key Results
    Stele ratio tended to increase with increasing root order, whereas cortex ratio either remained unchanged or decreased with increasing order in all species. The CT ratio was significantly positively correlated to the stele ratio and negatively correlated to the cortex ratio in second- to fourth-order roots across species during the shift from primary to secondary root growth. Ectomycorrhiza-associated species mostly had a higher stele ratio and lower cortex ratio than arbuscular mycorrhiza-associated species across root orders. Compared with arbuscular mycorrhiza species, there was greater accumulation of CT in response to changes in the root order of ectomycorrhiza species.




    Conclusions
    Different development patterns of the stele, cortex and CT accumulation along the transition from root tip to secondary roots could be distinguished between different mycorrhizal associations. The CT in tissues in different mycorrhizal associations could help with root protection in specific branching orders during shifts in stele and cortex development before and during cork layer formation.


  • Large-scale ecological field data for satellite validation in deciduous forests and grasslands.
    Akitsu, T.K; Nakaji, T; Kobayashi, H; Okano, T; Honda, Y; Bayarsaikhan, U; Terigele; Hayashi, M; Hiura, T; Ide, R; Igarashi, S; Kajiwara, K; Kumikawa, S; Matsuoka, Y; Nakano, T; Nakano, T; Okuda, A; Sato, T; Tachiiri, K; Takahashi, Y; Uchida, J; Nishida-Nasahara, K
    Ecological Research, 35, 6, DOI: 10.1111/1440-1703.12155., 1028, Wiley, Oct. 2020, [Peer-reviewed]
    English, Scientific journal
  • Field data for satellite validation and forest structure modeling in a pure and sparse forest of Picea glehnii in northern Hokkaido
    Tomoko K. Akitsu; Tatsuro Nakaji; Toshiya Yoshida; Rei Sakai; Wataru Mamiya; Terigele; Kentaro Takagi; Yoshiaki Honda; Koji Kajiwara; Kenlo N. Nasahara
    Ecological Research, Wiley, 25 May 2020, [Peer-reviewed]
    Scientific journal
  • Five-year nitrogen addition affects fine root exudation and its correlation with root respiration in a dominant species, Quercus crispula, of a cool temperate forest, Japan.
    Mioko Ataka; Lijuan Sun; Tatsuro Nakaji; Ayumi Katayama; Tsutom Hiura
    Tree physiology, 24 Jan. 2020, [Peer-reviewed], [International Magazine]
    English, In forest ecosystems, fine root respiration directly contributes to belowground carbon (C) cycling. Exudation from fine roots indirectly affects C cycling via enhanced microbial decomposition of soil organic matter. Although these root-derived C fluxes are essential components of belowground C cycling, how nitrogen (N) addition affects these fluxes and their correlations remains unclear. In this study, fine root exudation, respiration, and chemical/morphological traits were measured in a dominant canopy species, Quercus crispula, found in a cool temperate forest, the Tomakomai Experimental Forest (TOEF), Hokkaido University, which has undergone five-year N addition. Soil-dissolved organic carbon (DOC) was also measured in both bulk and rhizosphere soils to evaluate the impact of fine root exudation on soil C cycling. Compared to a control plot with no N treatment, fine roots in the N addition plot exhibited larger diameters and higher N concentrations, but lower specific root lengths (SRLs) and areas (SRAs). On a root-weight basis, respiration was not different between plots, but exudation was slightly higher under N addition. On a root-area basis, exudation was significantly higher in the N addition plot. Additionally, differences in DOC between rhizosphere and bulk soils were two times higher in the N addition plot than the control plot. Although fine root respiration was positively correlated with exudation in both the control and N addition plots, the ratio of exudation C to respiration C decreased after five-year N addition. N addition also affected absolute C allocation to fine root exudation and changed the C allocation strategy between exudation and respiration fluxes. These findings will help enhance predictions of belowground C allocation and C cycling under N-rich conditions in the future.
  • Exploring patterns of fine root morphological, chemical, and anatomical traits of 12 tree species from visible-near-infrared spectral reflectance
    Natsuko Tanikawa; Tatsuro Nakaji; Hikari Yahara; Naoki Makita
    PLANT AND SOIL, 445, 1-2, 469, 481, Dec. 2019, [Peer-reviewed]
    English, Scientific journal
  • Quantitative assessment of plant-arthropod interactions in forest canopies: A plot-based approach
    Martin Volf; Petr Klimeš; Greg P. A. Lamarre; Conor M. Redmond; Carlo L. Seifert; Tomokazu Abe; John Auga; Kristina Anderson-Teixeira; Yves Basset; Saul Beckett; Philip T. Butterill; Pavel Drozd; Erika Gonzalez-Akre; Ondřej Kaman; Naoto Kamata; Benita Laird-Hopkins; Martin Libra; Markus Manumbor; Scott E. Miller; Kenneth Molem; Ondřej Mottl; Masashi Murakami; Tatsuro Nakaji; Nichola S. Plowman; Petr Pyszko; Martin Šigut; Jan Šipoš; Robert Tropek; George D. Weiblen; Vojtech Novotny
    PLOS ONE, 14, 10, e0222119, e0222119, Public Library of Science (PLoS), 23 Oct. 2019, [Peer-reviewed]
    Scientific journal
  • Harmonized data on early stage litter decomposition using tea material across Japan
    Satoshi N. Suzuki; Mioko Ataka; Ika Djukic; Tsutomu Enoki; Karibu Fukuzawa; Mitsuru Hirota; Takuo Hishi; Tsutom Hiura; Kazuhiko Hoshizaki; Hideyuki Ida; Akira Iguchi; Yasuo Iimura; Takeshi Ise; Tanaka Kenta; Yoshifumi Kina; Hajime Kobayashi; Yuji Kominami; Hiroko Kurokawa; Kobayashi Makoto; Michinari Matsushita; Rie Miyata; Hiroyuki Muraoka; Tatsuro Nakaji; Masahiro Nakamura; Shigeru Niwa; Nam J. Noh; Takanori Sato; Tatsuyuki Seino; Hideaki Shibata; Ryo O. Suzuki; Koichi Takahashi; Tomonori Tsunoda; Tasuhiro Ustumi; Kenta Watanabe
    Ecological Research, 34, 5, 575, 576, 01 Sep. 2019, [Peer-reviewed]
    Scientific journal
  • Limitation in the Photosynthetic Acclimation to High Temperature in Canopy Leaves of Quercus serrata
    Daisuke P. Yamaguchi; Dai Mishima; Kozue Nakamura; Junji Sano; Tatsuro Nakaji; Tsutom Hiura; Kouki Hikosaka
    FRONTIERS IN FORESTS AND GLOBAL CHANGE, 2, 19, May 2019, [Peer-reviewed]
    English, Scientific journal
  • VALIDATING GCOM-C TERRESTRIAL ECOLOGY PRODUCTS: HOW SHOULD IN-SITU OBSERVATION BE PERFORMED AT SATELLITE SCALE?
    Tomoko Akitsu; Kenlo Nishida Nasahara; Tatsuro Nakaji; Hajime Kobayashi; Tetsuo Okano; Nobuko Saigusa; Masato Hayashi; Reiko Ide; Yoshiaki Honda; Koji Kajiwara; Kaoru Tachiiri; Hideki Kobayashi; Kazuho Matsumoto; Toshiyuki Kobayashi
    2019 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS 2019), 9196, 9199, 2019
    English, International conference proceedings
  • Spatial assessment of leaf nitrogen content in a natural cool-temperate mixed forest using unmanned aerial vehicle derived 3D data.
    Kao Inoue; Hideaki Shibata; Toshiya Yoshida; Tatsuro Nakaji; Hiroyuki Obanawa; Akira Kato
    Jpn. J. For. Environ., 61, 1, 1, 13, 2019, [Peer-reviewed]
  • Plant constituents affecting food selection by Sika deer.
    Agetsuma, N; Agetsuma-Yanagihara, Y; Takafumi, H; Nakaji, T
    The Journal of Wildlife Management, 83, 669, 678, 2019, [Peer-reviewed]
  • Estimation of six leaf traits of East Asian forest tree species by leaf spectroscopy and partial least square regression
    Nakaji, T; Oguma, H; Nakamura, M; Kachina, P; Asanok, L; Marod, D; Aiba, M; Kurokawa, H; Kosugi, Y; Rahman Kassim, A; Hiura, T
    Remote Sensing of Environment, 233, 2019, [Peer-reviewed]
    English, Scientific journal
  • Assessment of values and trends in coarse spatial resolution NDVI datasets in Southeast Asia landscapes.
    Arjasakusuma, S; Yamaguchi, Y; Nakaji, T; Kosugi, Y; Shamsuddin, S.-A; Lion, M
    European Journal of Remote Sensing, 51, 863, 877, Jul. 2018, [Peer-reviewed]
  • Early stage litter decomposition across biomes
    Ika Djukic; Sebastian Kepfer-Rojas; Inger Kappel Schmidt; Klaus Steenberg Larsen; Claus Beier; Björn Berg; Kris Verheyen; Adriano Caliman; Alain Paquette; Alba Gutiérrez-Girón; Alberto Humber; Alejandro Valdecantos; Alessandro Petraglia; Heather Alexander; Algirdas Augustaitis; Amélie Saillard; Ana Carolina Ruiz Fernández; Ana I. Sousa; Ana I. Lillebø; Anderson da Rocha Gripp; André-Jean Francez; Andrea Fischer; Andreas Bohner; Andrey Malyshev; Andrijana Andrić; Andy Smith; Angela Stanisci; Anikó Seres; Anja Schmidt; Anna Avila; Anne Probst; Annie Ouin; Anzar A. Khuroo; Arne Verstraeten; Arely N. Palabral-Aguilera; Artur Stefanski; Aurora Gaxiola; Bart Muys; Bernard Bosman; Bernd Ahrends; Bill Parker; Birgit Sattler; Bo Yang; Bohdan Juráni; Brigitta Erschbamer; Carmen Eugenia Rodriguez Ortiz; Casper T. Christiansen; E. Carol Adair; Céline Meredieu; Cendrine Mony; Charles A. Nock; Chi-Ling Chen; Chiao-Ping Wang; Christel Baum; Christian Rixen; Christine Delire; Christophe Piscart; Christopher Andrews; Corinna Rebmann; Cristina Branquinho; Dana Polyanskaya; David Fuentes Delgado; Dirk Wundram; Diyaa Radeideh; Eduardo Ordóñez-Regil; Edward Crawford; Elena Preda; Elena Tropina; Elli Groner; Eric Lucot; Erzsébet Hornung; Esperança Gacia; Esther Lévesque; Evanilde Benedito; Evgeny A. Davydov; Evy Ampoorter; Fabio Padilha Bolzan; Felipe Varela; Ferdinand Kristöfel; Fernando T. Maestre; Florence Maunoury-Danger; Florian Hofhansl; Florian Kitz; Flurin Sutter; Francisco Cuesta; Francisco de Almeida Lobo; Franco Leandro de Souza; Frank Berninger; Franz Zehetner; Georg Wohlfahrt; George Vourlitis; Geovana Carreño-Rocabado; Gina Arena; Gisele Daiane Pinha; Grizelle González; Guylaine Canut; Hanna Lee; Hans Verbeeck; Harald Auge; Harald Pauli; Hassan Bismarck Nacro; Héctor A. Bahamonde; Heike Feldhaar; Heinke Jäger; Helena C. Serrano; Hélène Verheyden; Helge Bruelheide; Henning Meesenburg; Hermann Jungkunst; Hervé Jactel; Hideaki Shibata; Hiroko Kurokawa; Hugo López Rosas; Hugo L. Rojas Villalobos; Ian Yesilonis; Inara Melece; Inge Van Halder; Inmaculada García Quirós; Isaac Makelele; Issaka Senou; István Fekete; Ivan Mihal; Ivika Ostonen; Jana Borovská; Javier Roales; Jawad Shoqeir; Jean-Christophe Lata; Jean-Paul Theurillat; Jean-Luc Probst; Jess Zimmerman; Jeyanny Vijayanathan; Jianwu Tang; Jill Thompson; Jiří Doležal; Joan-Albert Sanchez-Cabeza; Joël Merlet; Joh Henschel; Johan Neirynck; Johannes Knops; John Loehr; Jonathan von Oppen; Jónína Sigríður Þorláksdóttir; Jörg Löffler; José-Gilberto Cardoso-Mohedano; José-Luis Benito-Alonso; Jose Marcelo Torezan; Joseph C. Morina; Juan J. Jiménez; Juan Dario Quinde; Juha Alatalo; Julia Seeber; Jutta Stadler; Kaie Kriiska; Kalifa Coulibaly; Karibu Fukuzawa; Katalin Szlavecz; Katarína Gerhátová; Kate Lajtha; Kathrin Käppeler; Katie A. Jennings; Katja Tielbörger; Kazuhiko Hoshizaki; Ken Green; Lambiénou Yé; Laryssa Helena Ribeiro Pazianoto; Laura Dienstbach; Laura Williams; Laura Yahdjian; Laurel M. Brigham; Liesbeth van den Brink; Lindsey Rustad; Lipeng Zhang; Lourdes Morillas; Lu Xiankai; Luciana Silva Carneiro; Luciano Di Martino; Luis Villar; Maaike Y. Bader; Madison Morley; Marc Lebouvier; Marcello Tomaselli; Marcelo Sternberg; Marcus Schaub; Margarida Santos-Reis; Maria Glushkova; María Guadalupe Almazán Torres; Marie-Andrée Giroux; Marie-Anne de Graaff; Marie-Noëlle Pons; Marijn Bauters; Marina Mazón; Mark Frenzel; Markus Didion; Markus Wagner; Maroof Hamid; Marta L. Lopes; Martha Apple; Martin Schädler; Martin Weih; Matteo Gualmini; Matthew A. Vadeboncoeur; Michael Bierbaumer; Michael Danger; Michael Liddell; Michael Mirtl; Michael Scherer-Lorenzen; Michal Růžek; Michele Carbognani; Michele Di Musciano; Michinari Matsushita; Miglena Zhiyanski; Mihai Pușcaș; Milan Barna; Mioko Ataka; Mo Jiangming; Mohammed Alsafran; Monique Carnol; Nadia Barsoum; Naoko Tokuchi; Nico Eisenhauer; Nicolas Lecomte; Nina Filippova; Norbert Hölzel; Olga Ferlian; Oscar Romero; Osvaldo B. Pinto; Pablo Peri; Paige Weber; Pascal Vittoz; Pavel Dan Turtureanu; Peter Fleischer; Peter Macreadie; Peter Haase; Peter Reich; Petr Petřík; Philippe Choler; Pierre Marmonier; Priscilla Muriel; Quentin Ponette; Rafael Dettogni Guariento; Rafaella Canessa; Ralf Kiese; Rebecca Hewitt; Regin Rønn; Rita Adrian; Róbert Kanka; Robert Weigel; Roberto Cazzolla Gatti; Rodrigo Lemes Martins; Romain Georges; Rosa Isela Meneses; Rosario G. Gavilán; Sabyasachi Dasgupta; Sally Wittlinger; Sara Puijalon; Sarah Freda; Satoshi Suzuki; Sean Charles; Sébastien Gogo; Simon Drollinger; Simone Mereu; Sonja Wipf; Stacey Trevathan-Tackett; Stefan Löfgren; Stefan Stoll; Stefan Trogisch; Stefanie Hoeber; Steffen Seitz; Stephan Glatzel; Sue J. Milton; Sylvie Dousset; Taiki Mori; Takanori Sato; Takeshi Ise; Takuo Hishi; Tanaka Kenta; Tatsuro Nakaji; Thaisa Sala Michelan; Thierry Camboulive; Thomas J. Mozdzer; Thomas Scholten; Thomas Spiegelberger; Thomas Zechmeister; Till Kleinebecker; Tsutom Hiura; Tsutomu Enoki; Tudor-Mihai Ursu; Umberto Morra di Cella; Ute Hamer; Valentin H. Klaus; Vanessa Mendes Rêgo; Valter Di Cecco; Verena Busch; Veronika Fontana; Veronika Piscová; Victoria Carbonell; Victoria Ochoa; Vincent Bretagnolle; Vincent Maire; Vinicius Farjalla; Wenjun Zhou; Wentao Luo; William H. McDowell; Yalin Hu; Yasuhiro Utsumi; Yuji Kominami; Yulia Zaika; Yury Rozhkov; Zsolt Kotroczó; Zsolt Tóth
    Science of The Total Environment, 628-629, 1369, 1394, Jul. 2018, [Peer-reviewed]
    English, Scientific journal
  • 8 million phenological and sky images from 29 ecosystems from the Arctic to the tropics: the Phenological Eyes Network
    Shin Nagai; Tomoko Akitsu; Taku M. Saitoh; Robert C. Busey; Karibu Fukuzawa; Yoshiaki Honda; Tomoaki Ichie; Reiko Ide; Hiroki Ikawa; Akira Iwasaki; Koki Iwao; Koji Kajiwara; Sinkyu Kang; Yongwon Kim; Kho Lip Khoon; Alexander V. Kononov; Yoshiko Kosugi; Takahisa Maeda; Wataru Mamiya; Masayuki Matsuoka; Trofim C. Maximov; Annette Menzel; Tomoaki Miura; Toshie Mizunuma; Tomoki Morozumi; Takeshi Motohka; Hiroyuki Muraoka; Hirohiko Nagano; Taro Nakai; Tatsuro Nakaji; Hiroyuki Oguma; Takeshi Ohta; Keisuke Ono; Runi Anak Sylvester Pungga; Roman E. Petrov; Rei Sakai; Christian Schunk; Seikoh Sekikawa; Ruslan Shakhmatov; Yowhan Son; Atsuko Sugimoto; Rikie Suzuki; Kentaro Takagi; Satoru Takanashi; Shunsuke Tei; Satoshi Tsuchida; Hirokazu Yamamoto; Eri Yamasaki; Megumi Yamashita; Tae Kyung Yoon; Toshiya Yoshida; Mitsunori Yoshimura; Shinpei Yoshitake; Matthew Wilkinson; Lisa Wingate; Kenlo Nishida Nasahara
    Ecological Research, 33, 6, 1, 2, Springer Tokyo, 26 Jun. 2018, [Peer-reviewed]
    English, Scientific journal
  • What can we do for revitalization of higher education? : Group discussion in Annual meeting of Forest Research Station 2015
    中路達郎; 岸田治; 内海俊介; 福澤加里部; 小林真; 伊藤悠也; 間宮春大; 芦谷大太郎; 上浦達哉
    北方森林保全技術, 34, 34, 43, 47, 北海道大学北方生物圏フィールド科学センター森林圏ステーション, 2017
    Japanese
  • Spectrometry for ecologists
    Yutaka Okuzaki; Koji Mochida; Shin Nagai; Tatsuro Nakaji; Hiroyuki Oguma
    Japanese Journal of Ecology, 67, 1, 41, 56, 2017, [Peer-reviewed]
  • Effects of seasonal change and experimental warming on the temperature dependence of photosynthesis in the canopy leaves of Quercus serrata
    Daisuke P. Yamaguchi; Tatsuro Nakaji; Tsutom Hiura; Kouki Hikosaka
    TREE PHYSIOLOGY, 36, 10, 1283, 1295, Oct. 2016, [Peer-reviewed]
    English, Scientific journal
  • Root Production of Fagus crenata Blume Saplings Grown in Two Soils and Exposed to Elevated CO2 Concentration: an 11-Year Free-Air-CO2 Enrichment (FACE) Experiment in Northern Japan
    Evgenios Agathokleous; Makoto Watanabe; Norikazu Eguchi; Tatsuro Nakaji; Fuyuki Satoh; Takayoshi Koike
    WATER AIR AND SOIL POLLUTION, 227, 6, 187, Jun. 2016, [Peer-reviewed]
    English, Scientific journal
  • Fine root turnover of Japanese white birch (Betula platyphylla var. japonica) grown under elevated CO2 in northern Japan
    Xiaona Wang; Saki Fujita; Tatsuro Nakaji; Makoto Watanabe; Fuyuki Satoh; Takayoshi Koike
    TREES-STRUCTURE AND FUNCTION, 30, 2, 363, 374, Apr. 2016, [Peer-reviewed]
    English, Scientific journal
  • Impact of elevated CO2 on root traits of a sapling community of three birches and an oak: a free-air-CO2 enrichment (FACE) in northern Japan
    Evgenios Agathokleous; Makoto Watanabe; Tatsuro Nakaji; Xiaona Wang; Fuyuki Satoh; Takayoshi Koike
    TREES-STRUCTURE AND FUNCTION, 30, 2, 353, 362, Apr. 2016, [Peer-reviewed]
    English, Scientific journal
  • Responses of Soil, Heterotrophic, and Autotrophic Respiration to Experimental Open-Field Soil Warming in a Cool-Temperate Deciduous Forest
    Nam-Jin Noh; Masatoshi Kuribayashi; Taku M. Saitoh; Tatsuro Nakaji; Masahiro Nakamura; Tsutom Hiura; Hiroyuki Muraoka
    ECOSYSTEMS, 19, 3, 504, 520, Apr. 2016, [Peer-reviewed]
    English, Scientific journal
  • Different initial responses of the canopy herbivory rate in mature oak trees to experimental soil and branch warming in a soil-freezing area
    Masahiro Nakamura; Tatsuro Nakaji; Onno Muller; Tsutom Hiura
    Oikos, 124, 8, 1071, 1077, Wiley, Aug. 2015, [Peer-reviewed]
    Scientific journal
  • Interpreting canopy development and physiology using a European phenology camera network at flux sites
    L. Wingate; J. Ogee; E. Cremonese; G. Filippa; T. Mizunuma; M. Migliavacca; C. Moisy; M. Wilkinson; C. Moureaux; G. Wohlfahrt; A. Hammerle; L. Hoertnagl; C. Gimeno; A. Porcar-Castell; M. Galvagno; T. Nakaji; J. Morison; O. Kolle; A. Knohl; W. Kutsch; P. Kolari; E. Nikinmaa; A. Ibrom; B. Gielen; W. Eugster; M. Balzarolo; D. Papale; K. Klumpp; B. Koestner; T. Gruenwald; R. Joffre; J. -M. Ourcival; M. Hellstrom; A. Lindroth; C. George; B. Longdoz; B. Genty; J. Levula; B. Heinesch; M. Sprintsin; D. Yakir; T. Manise; D. Guyon; H. Ahrends; A. Plaza-Aguilar; J. H. Guan; J. Grace
    BIOGEOSCIENCES, 12, 20, 5995, 6015, 2015, [Peer-reviewed]
    English, Scientific journal
  • Biogeochemical nitrogen properties of forest soils in the Japanese archipelago
    Rieko Urakawa; Nobuhito Ohte; Hideaki Shibata; Ryunosuke Tateno; Takuo Hishi; Keitaro Fukushima; Yoshiyuki Inagaki; Keizo Hirai; Tomoki Oda; Nobuhiro Oyanagi; Makoto Nakata; Hiroto Toda; Tanaka Kenta; Karibu Fukuzawa; Tsunehiro Watanabe; Naoko Tokuchi; Tatsuro Nakaji; Nobuko Saigusa; Yukio Yamao; Asami Nakanishi; Tsutomu Enoki; Shin Ugawa; Atsushi Hayakawa; Ayumi Kotani; Megumi Kuroiwa; Kazuo Isobe
    ECOLOGICAL RESEARCH, 30, 1, 1, 2, Jan. 2015, [Peer-reviewed]
    English
  • Estimation of light-use efficiency through a combinational use of the photochemical reflectance index and vapor pressure deficit in an evergreen tropical rainforest at Pasoh, Peninsular Malaysia
    Tatsuro Nakaji; Yoshiko Kosugi; Satoru Takanashi; Kaoru Niiyama; Shoji Noguchi; Makoto Tani; Hiroyuki Oguma; Abdul Rahim Nik; Abd Rahman Kassim
    REMOTE SENSING OF ENVIRONMENT, 150, 82, 92, Jul. 2014, [Peer-reviewed]
    English, Scientific journal
  • Remote sensing of leaf traits in the forest
    Nakaji, T; Oguma, H; Hiura, T
    Japanese Journal of Ecology, 64, 3, 215, 221, The Ecological Society of Japan, 2014, [Peer-reviewed]
    Japanese, 近年、対象物からの反射を連続多波長で分光計測するハイパースペクトルリモートセンシングが生態系研究分野で注目されている。特に先進的な熱帯林の研究では、ハイパースペクトルリモートセングで得られた可視-短波長赤外波長の連続分光反射率データと多変量解析手法を駆使し、樹木の生産力や養分動態、樹種判別に関連した多種類の葉形質の非破壊・同時推定が可能になりつつある。葉形質の時空間変動の把握は気候変動の影響予測や生物多様性の評価においても重要であり、今後、地球規模のニーズに応えるためにも、幅広いバイオームでリモートセンシング研究の発展と生態系研究との一層の連携が期待される。
  • Soil warming decreases inorganic and dissolved organic nitrogen pools by preventing the soil from freezing in a cool temperate forest
    Miki U. Ueda; Onno Muller; Masahiro Nakamura; Tatsuro Nakaji; Tsutom Hiura
    SOIL BIOLOGY & BIOCHEMISTRY, 61, 105, 108, Jun. 2013, [Peer-reviewed]
    English, Scientific journal
  • Seasonal variation of isoprene basal emission in mature Quercus crispula trees under experimental warming of roots and branches
    Sou N. Matsunaga; Onno Muller; Satoru Chatani; Masahiro Nakamura; Tatsuro Nakaji; Tsutom Hiura
    GEOCHEMICAL JOURNAL, 46, 2, 163, 167, 2012, [Peer-reviewed]
    English, Scientific journal
  • Ground-Based Monitoring of the Leaf Phenology of Deciduous Broad-Leaved Trees using High Resolution NDVI Camera Images
    Tatsuro Nakaji; Tsutom Hiura; Hiroyuki Oguma
    Journal of Agricultural Meteorology, 67, 2, 65, 74, 01 Sep. 2011, [Peer-reviewed]
    English, Scientific journal
  • Advantages of Visible-Band Spectral Remote Sensing at Both Satellite and Near-Surface Scales for Monitoring the Seasonal Dynamics of GPP in a Japanese Larch Forest
    Reiko Ide; Hiroyuki Oguma; Tatsuro Nakaji; Takeshi Motohka
    Journal of Agricultural Meteorology, 67, 2, 75, 84, 01 Sep. 2011, [Peer-reviewed]
    English, Scientific journal
  • Experimental branch warming alters tall tree leaf phenology and acorn production
    Masahiro Nakamura; Onno Muller; Shiori Tayanagi; Tatsuro Nakaji; Tsutom Hiura
    AGRICULTURAL AND FOREST METEOROLOGY, 150, 7-8, 1026, 1029, Jul. 2010, [Peer-reviewed]
    English, Scientific journal
  • Assessment of canopy photosynthetic capacity and estimation of GPP by using spectral vegetation indices and the light-response function in a larch forest
    Reiko Ide; Tatsuro Nakaji; Hiroyuki Oguma
    AGRICULTURAL AND FOREST METEOROLOGY, 150, 3, 389, 398, Mar. 2010, [Peer-reviewed]
    English, Scientific journal
  • Change in CO2 balance under a series of forestry activities in a cool-temperate mixed forest with dense undergrowth
    Kentaro Takagi; Karibu Fukuzawa; Naishen Liang; Masazumi Kayama; Mutsumi Nomura; Hajime Hojyo; Sadao Sugata; Hideaki Shibata; Tatsuya Fukazawa; Yoshiyuki Takahashi; Tatsuro Nakaji; Hiroyuki Oguma; Masayoshi Mano; Yukio Akibayashi; Takeshi Murayama; Takayoshi Koike; Kaichiro Sasa; Yasumi Fujinuma
    GLOBAL CHANGE BIOLOGY, 15, 5, 1275, 1288, May 2009, [Peer-reviewed]
    English, Scientific journal
  • Classification of rhizosphere components using visible-near infrared spectral images
    Tatsuro Nakaji; Kyotaro Noguchi; Hiroyuki Oguma
    PLANT AND SOIL, 310, 1-2, 245, 261, Sep. 2008, [Peer-reviewed]
    English, Scientific journal
  • Utility of spectral vegetation indices for estimation of light conversion efficiency in coniferous forests in Japan
    Tatsuro Nakaji; Reiko Ide; Kentaro Takagi; Yoshiko Kosugi; Shinjiro Ohkubo; Kenlo Nishida Nasahara; Nobuko Saigusa; Hiroyuki Oguma
    AGRICULTURAL AND FOREST METEOROLOGY, 148, 5, 776, 787, May 2008, [Peer-reviewed]
    English, Scientific journal
  • Disruption of a gene encoding C(4)-dicarboxylate transporter-like protein increases ozone sensitivity through deregulation of the stomatal response in Arabidopsis thaliana
    Shoko Saji; Srinivas Bathula; Akihiro Kubo; Masanori Tamaoki; Machi Kanna; Mitsuko Aono; Nobuyoshi Nakajima; Tatsuro Nakaji; Tomomi Takeda; Munehiko Asayama; Hikaru Saji
    PLANT AND CELL PHYSIOLOGY, 49, 1, 2, 10, Jan. 2008, [Peer-reviewed]
    English, Scientific journal
  • Utility of spectral vegetation index for estimation of gross CO2 flux under varied sky conditions
    Tatsuro Nakaji; Reiko Ide; Hiroyuki Oguma; Nobuko Saigusa; Yasumi Fujinuma
    REMOTE SENSING OF ENVIRONMENT, 109, 3, 274, 284, Aug. 2007, [Peer-reviewed]
    English, Scientific journal
  • Seasonal changes in the relationship between photochemical reflectance index and photosynthetic light use efficiency of Japanese larch needles
    T Nakaji; H Oguma; Y Fujinuma
    INTERNATIONAL JOURNAL OF REMOTE SENSING, 27, 3, 493, 509, Feb. 2006, [Peer-reviewed]
    English, Scientific journal
  • Effects of ozone and soil water stress, singly and in combination, on leaf antioxidative systems of Fagus crenata seedlings.
    Watanabe, M; Yonekura, T; Honda, Y; Yoshidome, M; Nakaji, T; Izuta, T
    Journal of Agricultural Meteorology, 60, 6, 1105, 1108, 日本農業気象学会, 2005, [Peer-reviewed]
    English
  • Effect of autumn senescence on the relationship hetween the PRI and LUE of young Japanese larch trees
    T. Nakaji; T. Takeda; Y. Fujinuma; H. Oguma
    PHYTON-ANNALES REI BOTANICAE, 45, 4, 535, 542, 2005, [Peer-reviewed]
    English, Scientific journal
  • Growth, annual ring structure and nutrient status of Japanese red pine and Japanese cedar seedlings after three years of excessive N load
    T. Nakaji; T. Yonekura; M. Kuroha; S. Takenaga; T. Izuta
    PHYTON-ANNALES REI BOTANICAE, 45, 4, 457, 464, 2005, [Peer-reviewed]
    English, Scientific journal
  • Influence of elevated air temperature on the relationship between photochemical reflectance index (PRI) and photosynthetic light use efficiency of poplar leaves.
    Nakaji, T; Oguma, H; Fujinuma, Y
    Journal of Agricultural Meteorology, 60, 5, 989, 992, 日本農業気象学会, 2005, [Peer-reviewed]
    English
  • Growth, net photosynthesis and leaf nutrient status of Fagus crenata seedlings grown in brown forest soil acidified with H2SO4 or HNO3 solution.
    Izuta, T; Yamaoka, T; Nakaji, T; Yonekura, T; Yokoyama, M; Funada, R; Koike, T; Totsuka, T
    Trees, 18, 677, 685, 2004, [Peer-reviewed]
  • Growth and nitrogen availability of red pine seedlings under high nitrogen load and elevated ozone
    Tatsuro Nakaji; Takuya Kobayashi; Mihoko Kuroha; Kumiko Omori; Yuko Matsumoto; Tetsushi Yonekura; Katsuhiko Watanabe; Jarkko Utriainen; Takeshi Izuta
    Water, Air, and Soil Pollution: Focus, 4, 2-3, 277, 287, 2004, [Peer-reviewed]
    English, Scientific journal
  • Effects of high nitrogen load and ozone on forest tree species.
    Izuta, T; Nakaji, T
    Eurasian Journal of Forest Research, 6, 2, 155, 170, Hokkaido University Forests, EFRC, 2003, [Peer-reviewed]
    English, Review
  • Relationships between Photosynthesis and Spectral Reflectance Indices in Japanese Larch Needles.
    Nakaji T; Takeda T; Mukai Y; Koike T; Oguma H; Fujinuma Y
    JOURNAL OF THE JAPANESE FORESTRY SOCIETY, 85, 3, 205, 213, THE JAPANESE FORESTRY SOCIETY, 2003, [Peer-reviewed]
    We investigated two spectral reflectance indices, the normalized difference vegetation index (NDVI) and the photochemical reflectance index (PRI) as indicators of photosynthetic pigments and photosynthesis in Japanese larch (Larix kaempferi Sarg.) needles. Daily courses of spectral reflectance, photosynthetic pigment concentration and photosynthetic activity (net photosynthetic rate and chlorophyll fluorescence) of the needles were measured in a 4-year-old larch plantation in August 2002. No significant correlations were found between needle pigment concentrations and either index. Although the daily course of net photosynthetic rate correlated with that of NDVI, this relationship varied under weak light conditions in the evening. PRI was significantly linked to epoxidation state in xanthophyll cycle, light use efficiency (LUE) of CO2 assimilation and quantum yield of PS II with higher correlation coefficient than NDVI was. We conclude that PRI is usable for estimating daily changing photosynthetic light use efficiency in larch needles.
  • Photosynthetic response of Pinus densiflora seedlings to high nitrogen load.
    Nakaji, T; Takenaga, S; Kuroha, M; Izuta, T
    Environmental Sciences, 9, 269, 282, 2002, [Peer-reviewed]
  • Field Survey on Phenological Characteristics and Leaf Components of Betula ermanii Cham.and Soil Chemical Property around Mt. Mae-Shirane,Oku-Nikko,Japan
    TAMURA Toshiki; YONEKURA Tetsushi; NAKAJI Tatsuro; FENG Yanwen; SHIMIZU Hideyuki; IZUTA Takeshi
    Journal of Japan Society for Atmospheric Environment, 37, 5, 320, 330, Japan Society for Atmospheric Environment, 2002, [Peer-reviewed]
    Japanese, To obtain basic data for clarifying the relationships between environmental factors and forest decline,we investigated leaf phenological characteristics and leaf components of birch (Betula ermanii),and soil chemical properties at birch stands around Mt. Mae-Shirane,Oku-Nikko,Japan from June to October,2000. The trees growing on the NW-facing slope were not declining,but those growing on the SE-facing slope were declining. In the summer,the leaves of the trees growing on the SE-facing slope showed severe grazing damages by leaf insects,as compared to the leaves of trees growing on the NW-facing slope. Individual leaf area and leaf number per tree growing on the SE-facing slope were less than those of trees growing on the NW-facing slope. The leaf yellowing,leaf fall, and reduction in the concentrations of chlorophyll,Rubisco and total soluble protein of the leaves occurred earlier in trees growing on the SE-facing slope compared to trees growing on the NW-facing slope. Soil pH on the SE-facing slope was significantly higher than that on the NW-facing slope. The deficiency of elements such as K, Ca and Mg,and accumulation of Mn and Al were not observed in the soil or leaves of trees growing on the SE-facing slope. In conclusion,decline of Betula ermanii growing on the SE-facing slope around Mt. Mae-Shirane cannot be explained by soil acidification and nutrient deficiency of soil and leaves.
  • Effects of high nitrogen load on growth, photosynthesis and nutrient status of Cryptomeria japonica and Pinus densiflora seedlings
    T Nakaji; M Fukami; Y Dokiya; T Izuta
    TREES-STRUCTURE AND FUNCTION, 15, 8, 453, 461, Dec. 2001, [Peer-reviewed]
    English, Scientific journal
  • Growth, net photosynthetic rate, nutrient status and secondary xylem anatomical characteristics of Fagus crenata seedlings grown in brown forest soil acidified with H2SO4 solution
    T Izuta; T Yamaoka; T Nakaji; T Yonekura; M Yokoyama; H Matsumura; S Ishida; K Yazaki; R Funada; T Koike
    WATER AIR AND SOIL POLLUTION, 130, 1-4, 1007, 1012, Aug. 2001, [Peer-reviewed]
    English, Scientific journal
  • Effects of ozone and/or excess soil nitrogen on growth, needle gas exchange rates and rubisco contents of Pinus densiflora seedlings
    T Nakaji; T Izuta
    WATER AIR AND SOIL POLLUTION, 130, 1-4, 971, 976, Aug. 2001, [Peer-reviewed]
    English, Scientific journal
■ Other Activities and Achievements
■ Books and other publications
  • 図解でよくわかる根のきほん : 根の種類、構造、機能から、品目ごとの特徴、樹種による違い、環境へのかかわりまで
    根研究学会, 火山活動とともに生きる樹木, p46-47
    誠文堂新光社, Oct. 2024, 9784416623091, 175p, Japanese, [Contributor]
  • 木本植物の被食防衛 : 変動環境下でゆらぐ植食者との関係
    小池, 孝良; 塩尻, かおり; 中村, 誠宏; 鎌田, 直人, コラム リモートセンシングによる被食防衛モニタリング, p124-126
    共立出版, Mar. 2023, 9784320058408, xiv, 253p, 図版 [8] p, Japanese, [Contributor]
  • 森林保護学の基礎
    小池, 孝良; 中村, 誠宏; 宮本, 敏澄, コラム5-7 「リモートセンシングで解析がすすむ森林と植食生昆虫の関係」
    農山漁村文化協会, Apr. 2021, 9784540122101, 191p, Japanese
  • 森の根の生態学 = Root ecology of forest trees
    平野, 恭弘; 野口, 享太郎; 大橋, 瑞江, 第4章 はじめに、第1節「大気CO2濃度およびO3濃度上昇に対する樹木根の応答」、おわりに
    共立出版, Dec. 2020, 9784320058132, xii, 352p, Japanese
  • 大気環境と植物
    伊豆田, 猛; 青野, 光子; 石田, 厚; 北尾, 光俊; 黄瀬, 佳之; 佐治, 光; 佐瀬, 裕之; 高木, 健太郎(地球環境科学); 玉置, 雅紀; 徳地, 直子; 中路, 達郎; 増冨, 祐司; 松田, 和秀; 松村, 秀幸; 山口, 真弘; 米倉, 哲志; 渡辺, 誠(農学), 5章第2節 リモートセンシングによる大気環境の植物影響評価
    朝倉書店, Oct. 2020, 9784254420456, vii, 162p, 図版2枚, Japanese
  • Air pollution impacts on plants in East Asia
    伊豆田, 猛, 18. Effects of nitrogen load on Asian trees
    Springer, 20 Feb. 2017, 4431564365, 331, English
  • 植生のリモートセンシング
    Jones, Hamlyn G.; Vaughan, R. A. (Robin Antony); 本岡, 毅; 久米, 篤; 大政, 謙次; 斎藤, 琢; 細井, 文樹; 加治佐, 剛; 村上, 拓彦; 太田, 徹志; 小野, 圭介; 清水, 庸; 中路, 達郎, 11 リモートセンシングの総合的な利用
    森北出版, Sep. 2013, 9784627261013, xxv, 446p, 図版15p, Japanese
  • 植物と環境ストレス（伊豆田 猛編著、第2章3節・4節担当）
    コロナ社, 2006, 4339067377
■ Syllabus
  • 大学院共通授業科目（一般科目）：自然科学・応用科学, 2024年, 修士課程, 大学院共通科目
  • 北方生態系の生物多様性基礎論, 2024年, 修士課程, 環境科学院
  • 生物圏科学実習Ⅰ, 2024年, 修士課程, 環境科学院
  • 生物圏科学実習Ⅱ, 2024年, 修士課程, 環境科学院
  • 森林圏科学特論Ⅳ, 2024年, 修士課程, 環境科学院
  • 一般教育演習(ﾌﾚｯｼｭﾏﾝｾﾐﾅｰ), 2024年, 学士課程, 全学教育
  • 一般教育演習(ﾌﾚｯｼｭﾏﾝｾﾐﾅｰ), 2024年, 学士課程, 全学教育
  • 一般教育演習(ﾌﾚｯｼｭﾏﾝｾﾐﾅｰ), 2024年, 学士課程, 全学教育
  • 森林空間機能学, 2024年, 学士課程, 農学部
  • 森林空間機能学演習, 2024年, 学士課程, 農学部
■ Affiliated academic society
  • American Geophysical Union
  • 日本リモートセンシング学会
  • 日本生態学会
  • 日本森林学会
  • 大気環境学会
■ Research Themes
  • Measurement and modeling of solar-induced chlorophyll fluorescence in tropical forest
    Grants-in-Aid for Scientific Research
    01 Apr. 2022 - 31 Mar. 2026
    加藤 知道; 宮内 達也; 彦坂 幸毅; 小林 秀樹; 中路 達郎; 野田 響; 冨松 元; 小杉 緑子
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 22H00554
  • 東ユーラシア低～高緯度域を縦断した大気－森林生態系の物質交換機能解明
    科学研究費助成事業
    10 Sep. 2021 - 31 Mar. 2026
    熊谷 朝臣; 村岡 裕由; 福田 健二; 久米 朋宣; 清水 貴範; 中路 達郎; 斎藤 琢; 植山 雅仁; 小林 真; 日浦 勉; 飯田 真一; 市榮 智明; 宮沢 良行; 中村 誠宏
    日本学術振興会, 学術変革領域研究(A), 東京大学, 21H05316
  • 埋没による土壌深層への長期炭素貯留・隔離：その要因と放出耐性
    科学研究費助成事業
    01 Apr. 2022 - 31 Mar. 2025
    保原 達; 松本 真悟; 森泉 美穂子; 澤本 卓治; 中路 達郎
    日本学術振興会, 基盤研究(C), 酪農学園大学, 22K12360
  • Identification of fine root species by visible near-infrared spectral reflectance
    Grants-in-Aid for Scientific Research
    09 Jul. 2021 - 31 Mar. 2024
    牧田 直樹; 中路 達郎
    複数の樹種が交わる森林生態系において地下部の種の多様性と機能を理解するためには、根の種を同定することが必須である。しかし、詳細な形態情報をもとに種の分類と検索法が確立されている地上部（葉や樹皮）と異なり、根の種識別に関しては、色や形態構造等の情報が乏しく、いまだに客観的な識別法の確立には至っていない。この結果、様々な種が入り交じっている森林生態系での地下部の研究では、その識別の困難さゆえに、根の種を同定せず「根」という区分でひとくくりに扱っているのが現状であり、まさに今、研究のブレークスルーが待ち望まれている。
    本課題では、可視-近赤外分光技術を駆使して、根の種識別の課題に挑戦した。分光技術は、対象物からの反射光を連続した多波長に分光し画像として計測する非破壊観測法である。植物組織の分光反射の波長依存性と強度（反射スペクトル）は、色素や有機物、水分などの内部の化学組成や細胞構造の発達段階を反映する。このため、反射スペクトルはリモートセンシングの分野では地上植生の分類や、窒素、水分などのマッピングに利用されており、観測者の主観を排除した客観的評価や再解析を可能にしている。本研究は、この技術を樹木根の観測に応用し、客観的かつ瞬時に種の識別できる方法の確立を目的とした。
    初年度は、根系の可視-近赤外分光反射率の技術の確立を実施した。微小な根系に焦点を調節した高解像度ハイパースペクトル（多波長分光）カメラを用いて380～2500nm の連続多波長の分光反射率画像を撮影し、様々な種における樹木根の分光反射率の特徴を形態・太さごとに抽出することを試みた。結果、根系の分光反射率は、樹種ごとで値が大きく異なる、一方、波長ごとに樹種差を超えた類似したパターンを示した。
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Research (Exploratory), Shinshu University, 21K19140
  • 森林光合成とフェノロジーへの気候変動ストレス影響の生理生態学的解明と将来変動予測
    科学研究費助成事業
    01 Apr. 2019 - 31 Mar. 2023
    村岡 裕由; 中路 達郎; 野田 響; 永井 信; 村山 昌平
    本年も新型コロナ感染症拡大により研究活動等は影響を受けたが，以下の成果を得た。
    岐阜・高山の落葉広葉樹林では引き続き林冠木の個葉生理生態学的特性のフェノロジーの調査を温暖化実験区と対象区で行った。春の気温の年変動は展葉期を14―16日変動させ，個葉の光合成生産を14―24％変動させると推定された。長期観測と温暖化実験での傾向には大差は認められず，これらの知見から信頼性の高いフェノロジーモデルの構築が可能となる。昨年より延期された国際研究集会を9月にオンライン開催し，成果を発表した。
    高山サイトでCO2フラックス・濃度，気象等の観測を継続した。20年程の長期観測データの解析より，年積算正味炭素収支の年々変動は，夏季の炭素収支に依存しており，夏季の日射量・葉面積指数および生物季節の年々変動と高い相関があることが示された。また，数年スケールの変動には台風来襲等による攪乱が影響を及ぼしていることが示唆された。
    極端気候などの気象災害や虫害などに対する樹種耐性についてリモートセンシングによって評価し，前年度に有効性が示唆されたGreen Ratioに基づく観測を北海道の落葉広葉樹林において継続し，多地点の定点カメラ観測を実施した。
    落葉広葉樹林林冠の分光反射率の季節変化の決定要因を群落放射伝達モデルと個葉放射伝達モデルにより解析した。LAIと個葉の分光特性の季節変化および群落内の幹枝の構造も考慮することにより，実際の林冠反射率の季節変化を再現できた。衛星により観測される森林の季節変化パターンの解析には，個葉や林冠構造に関する知見が不可欠であることが示された。
    詳細な地上観測値に基づいて開発した統計的なモデルにより，開葉日と落葉日を100年スケールで推定し，標高に沿った開葉日と落葉日の傾度の時間変化を評価した。また，推定値の妥当性を新たな地上観測値や高空間分可能を持つ衛星データを用いて検証した。
    日本学術振興会, 基盤研究(B), 岐阜大学, 19H03301
  • Physiology of fine roots of woody plants: how and how much they die
    Grants-in-Aid for Scientific Research
    01 Apr. 2018 - 31 Mar. 2022
    大橋 瑞江; 福澤 加里部; 中路 達郎; 牧田 直樹; 平野 恭弘; 野口 享太郎; 檀浦 正子; 大澤 晃
    樹木の細根は、葉のように短いサイクルで発生と枯死を繰り返すとされているが、このライフサイクルにおいて、最も不明瞭な部分が衰退から枯死への過程である。そこで本研究では、細根の動きを土壌中でモニタリングしながら枯死を誘導することで、細根の枯死過程を解明することを目的としている。さらに地上部のフェノロジーや土壌環境を同時に計測することで、細根の枯死を支配する要因を特定し、枯死根の定量評価を試みる。そのために次の4つの問に答えるための実験を実施した。① 枯死に伴う細根の形質の変化は何か？② 細根の枯死はどう定義されるか？③ 細根の枯死はいつ、どのくらい発生するか？④ 細根の枯死を引き起こす要因は何か？である。
    問①と②について、カラマツとヒノキの伐採後の経過年数が異なる根について、形態や生理状態の変化を求めた。またフィールドで採取した枯死根について、形態・化学組成・色情報などを取得し、枯死根の特性評価を行った。これらの実験では、根系研究者複数名に枯死根判定をしてもらい、判定者の数と判定の一致率を指標として、枯死根評価のばらつきを定量化した。さらに枯死根のばらつきを生む要因を明らかにするために、根の形態変化、分光反射率の変化、成分の変化などを計測した。
    問③と④では、フィールド実験を通して枯死の発生パターンを生態系レベルで評価するために、ヒノキの人工林や広葉樹の二次林などで細根動態の観察を行った。これまでに各試験地には市販のスキャナが差し込めるサイズのアクリルボックスを埋設を行った。そこで本年度は、これらのアクリルボックスにスキャナを差し込み、定期的に土壌画像をスキャンした。また、枯死の制御要因として土壌物理環境、地上部フェノロジーに着目し、試験地にセッティングしたこれらの測定機器を用いて、定期的に計測を行った。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), University of Hyogo, 18H02243
  • 熱帯雨林生態系における水循環機構と植生のレジリエンスの相互作用の解明
    科学研究費助成事業
    01 Apr. 2018 - 31 Mar. 2022
    小杉 緑子; 中路 達郎; 伊藤 雅之; 野口 正二; 高梨 聡
    本研究は、熱帯雨林の水循環機構と植生のレジリエンスとの相互作用を解明することを目的とする。東南アジア熱帯雨林（Pasoh森林保護区・半島マレーシア低地フタバガキ林）において、いつ・どこに・どれだけ「利用できる水」が存在するか（＝水循環機構）、水ストレスに対する樹木の生存戦略（＝植物水分生理）、ガス交換機能の安定性の中に隠された樹木の反応が示す安定性を支えるメカニズムと限界（＝生態系フ
    ラックス）、の３つの視点から現地観測を行い、これらの結果をアマゾン熱帯雨林などの他所のデータとも併せて統合的に解析することで、降水量変動に対して熱帯雨林がどのように反応しその機能を保ちうるか（＝熱帯雨林のレジリエンス）を評価するものである。


    本年度は、課題Aについて、保護区内の河川等に設置した水位計・EC計によって降雨流出応答を連続観測を継続している。課題Bについて、昨年度に引き続き、タワーサイト周辺の突出木から林床木まで様々なサイズの樹木において、各部の樹液流速および直径変化を連続測定する。水ポテンシャル、個葉の蒸散・光合成速度、気孔開閉様式、葉および葉柄での貯水量の日変化パターンを乾湿条件の異なるシーズン毎に測定した。課題Cについて、タワー上生態系フラックス（運動量・顕熱・潜熱・蒸発散・CO2フラックス）、分光反射および樹冠画像、降水量、放射各項、各高度での風速・気温・湿度・光量、CO2濃度、土壌各深度における体積含水率・地温・圧力水頭等について、観測を継続し、高品質な長期連続データの取得を行った。
    日本学術振興会, 基盤研究(B), 京都大学, 18H02239
  • Estimation of spatiotemporal variation in forest soil carbon stock by using field spectrscopy
    Grants-in-Aid for Scientific Research
    01 Apr. 2016 - 31 Mar. 2019
    NAKAJI Tatsuro
    In this study, we developed new spectroscopic monitoring method for estimating the vertical profiles of water content, organic component and respiration rate of forest soil in the field. Firstly we collected training data of NIR-SWIR spectral reflectance feature, chemical traits and respiration rate of forest soil from botomn of 13 tree species in cool temperate forest. Based on the statistical models, we clarified that the soil concentrations of water, N and cellulose explained the respiration rate at 2.1 % RMSE, and spectral reflectance model estimated these traits with 6 - 10.3% RMSE. We tested these estimation models by using field monitoring data in the forest. Field spectral measurement showed vertical profiles of soil traits and these traits provided estimated CO2 emission from forest soil in the field. These results indicate that the field monitoring of NIR-SWIR spectral reflectance can be used for rapid monitoring of soil traits and CO2 emission in the field.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 16H04929
  • Multidisciplinary study on the spatio-temporal dynamics of carbon cycle processes and prediction of their global warming responses in forest ecosystems
    Grants-in-Aid for Scientific Research
    01 Apr. 2014 - 31 Mar. 2018
    MURAOKA Hiroyuki; NAGAI Shin; NOH Nam-Jin; KURIBAYASHI Masatoshi; ITO Akihiko; KATO Tomomichi
    We aimed to investigate the carbon cycle processes in cool-temperate deciduous forest ecosystems in changing environments. Responses of leaf photosynthesis and its phenology, and soil respiration to rising temperature due to climate change were examined by open-field warming experiments in the studied forest. Development of optical remote sensing technique for canopy observations, and advancement of process-based simulation model were also conducted for spatio-temporal scaling analyses of photosynthesis and respiration in current and future environments. Multi-year observations of CO2 flux by eddy-covariance technique revealed that warmer spring induced earlier leaf expansion and hence higher photosynthesis at forest level, which were also supported experimentally by the canopy warming experiment and model predictions. The higher air temperature in autumn was suggested to lead higher ecosystem respiration, which was also supported by the soil warming experiment and a model analysis.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Gifu University, 26241005
  • Evaluation of the response of gas exchange between tropical rainforests and the atmosphere to the climate change based on the long-term tower observation.
    Grants-in-Aid for Scientific Research
    01 Apr. 2012 - 31 Mar. 2017
    Kosugi Yoshiko; YONEDA Takeshi; TANI Makoto; YAMASHITA Tamon; KAMAKURA Mai; ITOH Masayuki; DANNOURA Masako; TANAKA Katsunori; MATSUO Naoko
    This study evaluated the response of gas exchange between tropical rainforests and the atmosphere to the climate change based on the long-term tower observation. We conducted the long-term observation of the eddy covariance tower fluxes and micrometeorology at Pasoh, a leading tower site in a tropical rainforest in Peninsula Malaysia, to compile 14 years’ dataset. At the same time, we also conducted the census of above ground biomass to compile 22 years’ dataset. Adding the information on dead rate and decomposition rate to these datasets, we cross-checked these data and evaluated the dynamic equilibrium of the temporal variations of biomass, necromass, and NEE. We analyzed the influences of the climate change to the gas exchange processes between tropical rainforests and the atmosphere.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Kyoto University, 24255014
  • An attempt to quantify the degree of interaction in light interception between canopy trees in a forest
    Grants-in-Aid for Scientific Research
    01 Apr. 2013 - 31 Mar. 2016
    Kouki Hikosaka; HIURA Tsutom; NAKAJI Tatsuro
    In forests, distances between individual canopy trees are large and it is unclear the degree of interaction between individuals for light competition. In the present study, we evaluated the degree of interaction, which was defined as the fraction of light that penetrated through the foliage of neighbor individuals, using two methods. The results suggest that the degree of interaction in a forest is about 0.5, indicating there is a significant interaction in light interception between neighbors. This value is useful for modeling of game in light competition in forests, contributing to projection of CO2 absorption rate in future forests.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Tohoku University, 25660113
  • Initial responses of nutrient cycling and biodiversity to a large-scale N fertilization in a carbon flux monitoring site.
    Grants-in-Aid for Scientific Research
    01 Apr. 2013 - 31 Mar. 2016
    HIURA Tsutom; TOKUCHI Naoko; MIYAZAKI Yuko; NAKAJI Tatsuro; KATAYAMA Ayumi; MAKITA Naoki; NAKAMURA Masahiro; Lee Jin
    We revealed the initial response of below-ground carbon dynamics, N and P dynamics, reproduction of trees, and herbivory by insects to N deposition in a cool temperate forest ecosystem. We fertilized 10 ha in area, and established 9 ha control site during 3 years in a secondary deciduous broad-leaved forest of Tomakomai Experimental Forest, Hokkaido University.
    Biomass of fine roots, soil respiration rates, and phosphoric acids were increased by N fertilization. Reproductive organs of some tree species were tended to increase by the manipulation. Leaf traits of oak and alder species were altered but herbivory rates were not changed in the second year after treatment. In third year, diversity of herbivory insects decreased in the fertilized site.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 25292079
  • Development of advanced evaluation method for terrestrial CO2 budget by improving nitrogen-cycle processes
    Grants-in-Aid for Scientific Research
    01 Apr. 2011 - 31 Mar. 2014
    SAIGUSA Nobuko; HIURA Tsutomu; NAKAJI Tatsuro; SASAI Takahiro; MURAOKA Hiroyuki
    Temperature and nitrogen manipulation experiments were conducted in a forest ecosystem in Japan to understand the responses of ecosystem function and structure to the changes in temperature and nitrogen deposition. Environmental control on the CO2 exchange between ecosystems and the atmosphere was also investigated using long-term CO2 flux data over various ecosystems in Japan and in Asia. In addition, a terrestrial biosphere model was upgraded to consider nitrogen cycling processes based on the observed data from various ecosystems. The model successfully simulated the seasonal patterns of C/N ratio in the canopy leaves as well as the ecosystem carbon budget. The carbon and nitrogen budgets in terrestrial ecosystems around Japan were estimated by the model with a spatial resolution of 1km, and the temporal and spatial variations were analyzed in the viewpoint of responses of ecosystems to the changes in the atmospheric nitrogen deposition.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), National Institute for Environmental Studies, 23310015
  • Detection of warming response of tree rhizosphere by using NIR rhizotron
    Grants-in-Aid for Scientific Research
    2011 - 2013
    NAKAJI TATSURO
    Tree roots and litter are main component of below-ground C stock in the forest. Although the non-destructive monitoring of below-ground C balance and its response to the warming are important for estimation of current/future environment of our forests, the usable technique has not been developed yet. In this study, I developed the new rhizotron system for non-destructive monitoring of C and C-related root traits by application of NIR spectral imaging technique. I concluded that the warming responses of total C and the related traits such as live status and specific root length were able to be estimated by combination use of VIS and NIR image.
    Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Hokkaido University, 23780154
  • Evaluation of carbon storage process into marine sediment based on new optical technology: non-destructive measurement of belowground production and degradation of seagrass
    Grants-in-Aid for Scientific Research
    2011 - 2012
    NAKAOKA Masahiro; FUKUZAWA Karibu; NAKAJI Tatsuro
    This project aims to establish a method for quantitatively estimating production and degradation rate of belowground parts of seagrass by adopting non-destructive optical measurement techniques developed in terrestrial ecosystem research. Firstly, an aquaculture experiment of eelgrass was conducted using indoor and outdoor aquaria to periodically monitor growth of rhizomes and roots using an optical scanner in non-destructive manner. It was revealed that the root biomass accounted ca. 3 % of a total biomass of eelgrass, but the whole belowground parts occupied 14% and contributed significantly as a sink of carbon in sediment. Secondarily, hyper spectral reflectance images of different-aged belowground parts of seagrass were captured at visible and near-infrared spectral region (446-894nm). The increase in age from 14-220 days reduced the reflectance of live fine roots mainly at visible spectral region. The dead seagrass parts showed low reflectance at whole spectral region. By developing the estimation model, root age and concentrations of carbon and nitrogen were predicted by the spectral reflectance at the error of 12-37% (rRMSE). In conclusion, it was shown that seagrass belowground production has clear seasonal cycle and contributes to blue carbon storage. It was firstly demonstrated that age of belowground parts, carbon and nitrogen balance can be determined non-destructively using spectral reflectance images.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Hokkaido University, 23657011
  • 指標生物群を用いた生態系機能の広域評価と情報基盤整備
    2009 - 2011
    環境省モニタリング1000、JaLTER、JapanFlux、PEN（Phonological Eyes Network)を連携させ、森林生態系における総合監視システムを構築する（環境省 環境研究・技術開発推進費、研究代表者 北海道大学 日浦 勉、中路は研究協力者として参画）。
    Competitive research funding
  • Elucidation of geographical differentiation of cool-temperate forest ecosystem function using large scale experiments and geographical environmental gradients
    Grants-in-Aid for Scientific Research
    2009 - 2011
    HIURA Tsutom; MURAOKA Hiroyuki; SAIGUSA Nobuko; SUYAMA Yoshihisa; HIKOSAKA Khoki; UTSUMI Yasuhiro; SANO Zyunji; NAKAJI Tatsuro; NAKAMURA Masahiro
    We clarified the physiological response of producers to the geographical environment gradient, and food chains in cool temperate forests, for major component species (beech, oak, birch) of forest communities on the basis of genetic variation. In order to clarify the response of forest ecosystems against global warming cool-temperate zone, we estimated the productivity, nutrient cycling and biodiversity of the forest ecosystems by using artificial global warming.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 21248017
  • ガス交換的視点による東南アジア熱帯雨林の機能評価
    科学研究費補助金
    2008 - 2011
    マレーシア国パソ森林保護区において系のガス交換速度と同時に、樹冠の分光反射率を連続的に計測し、植物のフェノロジーと温室効果ガスの吸収・放出ポテンシャルの関係を調査する（研究代表者 京都大学 小杉緑子）。
    Competitive research funding
  • 分光反射による森林植生のフェノロジーと生産性のリモートセンシング
    Competitive research funding
  • Remote estimation of phenology and productivity of forest vegetation using spectral reflectance
    National Institute Special Program of SMI Technology Development
    Competitive research funding