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Suzuki Satoshi

Field Science Center for Northern Biosphere　Forest Research Station　Nakagawa Experimental ForestAssociate Professor

Researcher basic information

■ Degree
  • 博士（理学）, 首都大学東京
■ URL
researchmap URLホームページURL■ Various IDs
ORCID IDResearcher ID
  • N-5142-2018
J-Global ID■ Research Keywords and Fields
Research Keyword
  • forest ecology
  • food web
  • dead wood
  • community ecology
  • 縞枯れ
  • 亜高山帯
  • 空間生態学
  • 森林動態
Research Field
  • Life Science, Forest science
  • Life Science, Ecology and environment
  • Environmental Science/Agriculture Science, Conservation of biological resources
■ Educational Organization

Career

■ Career
Career
  • Apr. 2024 - Present
    Hokkaido University, Field Science Center for Northern Biosphere, Associate Professor
  • Jan. 2013 - Mar. 2024
    東京大学農学生命科学研究科附属演習林, 助教
  • Apr. 2012 - Dec. 2012
    Shinshu University, Institute of Mountain Sciences (IMS), 助教（特定雇用）
  • Apr. 2010 - Mar. 2012
    財団法人 自然環境研究センター, プロジェクト専門員
Educational Background
  • Apr. 2006 - Mar. 2009, Tokyo Metropolitan University, 理工学研究科, 生命科学専攻 博士後期課程, Japan
  • Apr. 2003 - Mar. 2005, Tokyo Metropolitan University, 理学研究科, 生物科学選考 修士課程
  • Apr. 1999 - Mar. 2003, Tokyo Metropolitan University, Faculty of Science, Department of Biology

Research activity information

■ Awards
  • 2006, 日本生態学会 優秀ポスター賞
    Japan
  • 2005, 日本生態学会 最優秀ポスター賞
    Japan
■ Papers
  • Estimation of Carbon Stock in Living Biomass Using a Multi-Sensor Machine Learning Framework in Silviculturally Treated Forests in Northern Japan
    Nyo Me Htun; Toshiaki Owari; Satoshi N. Suzuki; Songqiu Deng; Tetsuyuki Kobayashi; Sakura Asato; Akio Oshima; Mutsuki Hirama; Koichi Takahashi; Yasuo Isozaki; Takumi Okahira; Ryota Konda; Satoshi Kita; Manato Fushimi
    2026
  • Enhancing tree-ring visibility: A comparative study of sample and imaging techniques for 62 temperate tree species
    Nela Altmanová; Martina Hrádková; Eva Návratová; Vít Pejcha; Václav Bažant; Savannah Collins-Key; Jiří Doležal; Daniel Druckenbrod; Tsutomu Enoki; Keyan Fang; Pavel Fibich; Grant L. Harley; Kazuhiko Hoshizaki; Hideyuki Ida; Masae I. Ishihara; Akira Kagawa; Kirill A. Korznikov; Justin Maxwell; Masahiro Nakamura; Mahoko Noguchi; David Orwig; Neil Pederson; Takeshi Sakai; Jeong-Wook Seo; Jong-Suk Song; Satoshi N. Suzuki; Clay Tucker; Jan Altman
    Dendrochronologia, 93, 126392, 126392, Elsevier BV, Oct. 2025
    Scientific journal
  • Spatial heterogeneity of tree-growth responses to climate across temperate forests in Northeast Asia
    Nela Altmanová; Pavel Fibich; Jiří Doležal; Václav Bažant; Tomáš Černý; Julieta G.Arco Molina; Tsutomu Enoki; Toshihiko Hara; Kazuhiko Hoshizaki; Hideyuki Ida; Pavel Janda; Akira Kagawa; Martin Kopecký; Kirill A. Korznikov; Pavel V. Krestov; Yasuhiro Kubota; Vojtěch Lanta; Martin Macek; Marek Mejstřík; Masahiro Nakamura; Mahoko Noguchi; Alexander M. Omelko; Petr Petřík; Takeshi Sakai; Jong Suk Song; Satoshi N. Suzuki; Miroslav Svoboda; Miroslav Šrůtek; Kerstin Treydte; Olga N. Ukhvatkina; Iva Ulbrichová; Anna S. Vozmishcheva; Xiaochun Wang; Jan Altman
    Agricultural and Forest Meteorology, 362, 01 Mar. 2025
    Scientific journal
  • Exploratory Attempts at Supplementary Planting around Cut Stumps in Old-Growth Norway Spruce (Picea abies) Plantation Forests - Case Study Using Containerized Seedlings of Three Native Conifer Species -
    木村徳志; 岡平卓巳; 及川希; 平間睦樹; 佐藤晴樹; 松井理生; 鈴木智之
    北方森林研究, 73, 2025
  • Utilising LiDAR-equipped iPhone in forestry: Constructing 3D models and measuring tree sizes in a planting site
    Nozomi Oikawa; Yuji Nakagawa; Toshiaki Owari; Shinichi Tatsumi; Satoshi N. Suzuki
    Ecological Solutions and Evidence, 6, 1, 2025
    Scientific journal
  • Oak Wilt Disease May Reduce the Initial Decay Rate of Dead Quercus serrata Stems by Altering Fungal Communities in the Wood
    Yu Fukasawa; Satsuki Kimura; Yuji Kominami; Masahiro Takagi; Kimiyo Matsukura; Kobayashi Makoto; Satoshi N. Suzuki; Shuhei Takemoto; Nobuaki Tanaka; Mayuko Jomura; Kohmei Kadowaki; Masayuki Ushio; Haruo Kinuura; Satoshi Yamashita
    Environmental Microbiology, 27, 1, e70026, e70026, Jan. 2025, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • Decline in functional diversity during the stem exclusion phase: Long-term tree census of secondary succession in a cool-temperate forest, central Japan
    Ravi Mohan Tiwari; Toshihide Hirao; Satoshi N. Suzuki
    Forest Ecology and Management, 568, 122110, 122110, Elsevier BV, Sep. 2024, [Peer-reviewed], [Last author, Corresponding author]
    English, Scientific journal
  • Forest monitoring data of 45 plots across the Japanese archipelago during 1980–2021
    Tetsuro Yoshikawa; Kumiko Totsu; Yayoi Takeuchi; Taku Kadoya; Tsutomu Enoki; Sakae Fujii; Atsuko S. Fukamachi; Mitsuru Hirota; Kazuhiko Hoshizaki; Naoki Iiyama; Yukio Ishikawa; Hiroki Itô; Hajime Kobayashi; Takashi S. Kohyama; Yasuo Konno; Akifumi Makita; Akira S. Mori; Dai Nagamatsu; Tohru Nakashizuka; Kanji Namikawa; Mahoko Noguchi; Michinori Sakimoto; Yoshinobu Ozaki; Tatsuyuki Seino; Hisashi Sugita; Jun‐Ichirou Suzuki; Ryo O. Suzuki; Satoshi N. Suzuki; Koichi Takahashi; Ryunosuke Tateno; Ryuichi Watanabe; Tamon Yamashita; Tomohiro Yoshida; Masae I. Ishihara; Tanaka Kenta; Masahiro Nakamura; Tsutom Hiura
    Ecological Research, Wiley, 19 Mar. 2024, [Peer-reviewed]
    English, Scientific journal, Abstract

    Long‐term monitoring of forest tree communities is a basis for elucidating forest structure and dynamics and for evaluating ecosystem functions such as primary production. Because global climate change is changing forest ecosystems from the local to the global scale, it is essential to document long‐term monitoring data of forests to examine the temporal and geographical trends of forest changes. We report monitoring data of 45 forest plots (average area 0.69 ha; range 0.0325–6.25 ha) at 27 sites in Japan. These plots are situated within 32.38° N to 43.36° N and at elevations ranging from 8 to 2453 m above sea level. The forest plots include both old‐growth and secondary forests, and cover various forest biomes, such as warm‐temperate evergreen forests, temperate deciduous broadleaved forests, and boreal or sub‐alpine coniferous forests. In each plot, all living trees and lianas larger than a certain minimum size (typically 15 cm stem girth at breast height) were repeatedly measured and survival and recruitment of stems were recorded over 5–40 years (average 17.3 years). The data are presented in the format used by the Monitoring Sites 1000 Project in Japan (Ishihara et al. 2011, Ecological Research, 26, 1007–1008) and in the sample‐based Darwin Core format. This dataset expands existing open monitoring data for Japanese forests and thereby facilitates further meta‐analysis of forest community structures and changes in relation to climate change and other drivers. The complete data set for this abstract is available in electronic format in MetaCat in JaLTER at http://db.cger.nies.go.jp/JaLTER/metacat/metacat/ERDP-2024-03.1/jalter-en.
  • 東京大学北海道演習林のミズナラ産地別試験地
    鈴木智之; 福岡哲; 木村徳志; 松井理生
    北海道の林木育種, 66, 2, 2024
  • Fauna of flower longicorn beetles (Coleoptera, Cerambycidae) in the University of Tokyo Hokkaido Forest
    土岐和多瑠; 石濱宣夫; 門司早紀; 松岡史晃; 湯澤宣久; 井口和信; 鈴木智之
    演習林(東京大学大学院農学生命科学研究科)(Web), 70, 2024
  • Leaving disturbance legacies conserves boreal conifers and maximizes net CO2 absorption under climate change and more frequent and larger windthrow regimes
    Wataru Hotta; Chihiro Haga; Junko Morimoto; Satoshi N. Suzuki; Takanori Matsui; Toshiaki Owari; Hideaki Shibata; Futoshi Nakamura
    Landscape Ecology, 38, 7, 1785, 1805, Springer Science and Business Media LLC, 20 May 2023
    Scientific journal
  • The 30-year impact of post-windthrow management on the forest regeneration process in northern Japan
    Jing Li; Junko Morimoto; Wataru Hotta; Satoshi N. Suzuki; Toshiaki Owari; Motoko Toyoshima; Futoshi Nakamura
    Landscape and Ecological Engineering, Springer Science and Business Media LLC, 30 Jan. 2023
    Scientific journal, Abstract

    The frequency and intensity of typhoons are expected to increase over time due to climate change. These changes may expose forests to more windthrow in the future, and increasing the resilience of hemiboreal forests through forest management after windthrow is important. Here, we quantified forest structure recovery using aerial photos and light detection and ranging (LiDAR) data after catastrophic windthrow events. Our aims are to test the following three hypotheses: (1) forest structure will not recover within 30 years after windthrow, (2) forest recovery will be affected not only by salvaging but also pre-windthrow attributes and geographical features, and (3) various post-windthrow management including salvaging will drastically alter tree species composition and delay forest recovery. Our results revealed that hypothesis (1) and (2) were supported and (3) was partially supported. The ordination results suggested that more than 30 years were needed to recover canopy tree height after windthrow in hemiboreal forests in Hokkaido, Japan. Salvage logging did not delay natural succession, but it significantly decreased the cover ratio of conifer species sites (0.107 ± 0.023) compared with natural succession sites (0.310 ± 0.091). The higher the elevation, the steeper the site, and the higher the average canopy height before windthrow, the slower the recovery of forest stands after windthrow and salvaging. Scarification and planting after salvage logging significantly increased the number of canopy trees, but those sites differed completely in species composition from the old growth forests. Our study thus determined that the choice and intensity of post-disturbance management in hemiboreal forests should be carefully considered based on the management purpose and local characteristics.
  • 東京大学北海道演習林におけるエゾマツコンテナ苗植栽後10年の成長と生存
    木村徳志; 鈴木智之; 福岡哲; 松井理生; 後藤晋; 尾張敏章
    北海道の林木育種, 65, 2, 2023
  • Test application of iPhone LiDAR in forestry Example of calculating the size of preplanned planting area from land survey
    及川希; 木村徳志; 羽塚冬馬; 鈴木智之
    北方森林研究, 71, 2023
  • Conversion of a Pinus strobus Plantation to a Conifer-Broadleaved Mixed Forest by Small-scale Clear-cutting and Scarification Treatments: Regeneration Dynamics of P. strobus and Native Tree Species duirng 15 Years
    高橋功一; 鈴木智之; 後藤晋
    日本森林学会誌, 105, 3, 2023
  • Effects of Sika Deer on Sub-alpine Coniferous Forest Dynamics in Northern Yatsugatake Based on a 20-Year Investigation
    平岡裕一郎; 西村尚之; 小山泰弘; 岡田充弘; 柳澤賢一; 鈴木智之; Borjigin Shinchilelt
    日本森林学会誌, 105, 6, 2023
  • Modeling Tree Recovery in Wind-Disturbed Forests with Dense Understory Species under Climate Change
    Chihiro Haga; Wataru Hotta; Takahiro Inoue; Takanori Matsui; Masahiro Aiba; Toshiaki Owari; Satoshi N. Suzuki; Hideaki Shibata; Junko Morimoto
    Ecological Modelling, 472, 110072, 110072, Elsevier BV, Oct. 2022
    Scientific journal
  • Ecological succession revisited from a temporal beta-diversity perspective
    Ryosuke Nakadai; Satoshi N. Suzuki
    Cold Spring Harbor Laboratory, 13 Sep. 2022
    Abstract

    Ecological succession, which is the community re-assembly process after a disturbance, is a study topic receiving renewed attention in relation to anthropogenic disturbance as well as one of the most classical ones in ecology. Previous studies occasionally revealed that compositional shifts decrease toward late succession stages and discussed the potential links with species life history and longevity. However, clear empirical evidence is not available until now because of limited analytical approaches. Therefore, traditional approaches used in previous studies could not quantify the relative contribution of demographic processes to apparent compositional shifts in communities.

    In the present study, we aimed to understand ecological succession processes by revealing the patterns of temporal beta diversity based on both conventional Bray-Curtis dissimilarity and recently developed individual-based dissimilarity indices using a long-term dataset. Specifically, we used published forest inventory data from permanent forest plots in cool temperate forests along a secondary successional chronosequence, with stands at 17 to 106 years post clear-cutting.

    We clearly demonstrated the detailed patterns of temporal beta-diversity indices (i.e., conventional Bray–Curtis dissimilarity and individual-based dissimilarity indices) based on stem number and stem basal area along long-term chronosequences across approximately one hundred years.

    Synthesis. Using a long-term forest inventory dataset, this study demonstrated the link between the apparent compositional shifts and the changes in each component of the demographic processes (i.e., recruitment, growth, and mortality) during secondary forest succession in the context of temporal beta diversity. As done in this study, future research on changes in community composition during ecological successions at various sites and systems will help elucidate the relationships between temporal changes in global biodiversity and the impact of anthropogenic environmental changes.
  • Variation in abundance of trees originating from sapling banks facilitates the coexistence of two Abies species in a wave‐regenerated forest
    Satoshi N. Suzuki; Naoki Kachi; Jun‐Ichirou Suzuki
    Ecological Research, 38, 1, 167, 176, Wiley, 07 Sep. 2022
    Scientific journal, Abstract

    The contribution of sapling banks to the coexistence of species with different shade tolerance under the “wave regeneration” regime has not been researched extensively. This study first assessed spatial and temporal variations in the relative dominance of two Abies species, Abies veitchii and Abies mariesii, with different shade tolerance in a wave‐regenerated forest. Second, we present the age structure and its spatial variation in young Abies stands (sapling stage) to exhibit the prevalence and variability of regeneration from sapling banks (defined as trees established 10 years before canopy opening). The relative dominance of A. mariesii, the more shade‐tolerant species, compared to that of A. veitchii, did not change over a period of 10 years, irrespective of stand developmental stages, indicating the importance of initial dominance in determining the local species composition. The tree ages at the sapling stage were significantly higher for A. mariesii than for A. veitchii. Approximately, 30% of all trees were likely to arise from a sapling bank, and 86% of them were A. mariesii. Age structure significantly varied between 5 × 5 m quadrats; some quadrats were dominated by A. mariesii originating from sapling banks, while others were dominated by A. veitchii that were established at the time of canopy opening. These results indicate that regeneration from sapling banks contributes to the dominance of A. mariesii and that the spatial variation in the abundance of trees originating from sapling banks is essential for the coexistence of A. mariesii with A. veitchii.
  • Bryophyte responses to experimental climate change in a mid-latitude forest-line ecotone
    Yoshitaka Oishi; Hajime Kobayashi; Satoshi N. Suzuki; Ryuji Kanai; Daisuke Masaki; Tanaka Kenta
    Alpine Botany, Springer Science and Business Media LLC, 17 Mar. 2022
    Scientific journal
  • 25-years dynamics of a riparian forest in a 18ha Long-Term Ecological Research plot
    小川瞳; 大川あゆ子; 井口和信; 鈴木智之
    北方森林研究, 70, 2022
  • Growth records of trees in the Iwanazawa long-term ecological research plot in the University of Tokyo Hokkaido Forest (1994-2019)
    小川瞳; 井口和信; 高橋康夫; 岡村行治; 大川あゆ子; 松井理生; 鈴木智之
    演習林(東京大学大学院農学生命科学研究科)(Web), 65, 2022
  • TREE SPECIES MAPPING OF A HEMIBOREAL MIXED FOREST USING MASK R-CNN
    Tatsuki Yoshii; Chinsu Lin; Satoshi Tatsuhara; Satoshi Suzuki; Takuya Hiroshima
    2022 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS 2022), 6228, 6231, 2022
    English, International conference proceedings
  • Relationship between behavior of Japanese deer and tree damage in the subalpine coniferous forest of Kita-Yatsugatake, Japan.
    小山泰弘; 柳澤賢一; 鈴木智之; SHINCHILET Borjigin; 西村尚之
    長野県植物研究会誌, 55, 2022
  • Author Correction: Contribution of conspecific negative density dependence to species diversity is increasing towards low environmental limitation in Japanese forests.
    Pavel Fibich; Masae I Ishihara; Satoshi N Suzuki; Jiří Doležal; Jan Altman
    Scientific reports, 11, 1, 24492, 24492, 23 Dec. 2021, [International Magazine]
    English
  • Long-term cumulative impacts of windthrow and subsequent management on tree species composition and aboveground biomass: A simulation study considering regeneration on downed logs
    Wataru Hotta; Junko Morimoto; Chihiro Haga; Satoshi N. Suzuki; Takahiro Inoue; Takanori Matsui; Toshiaki Owari; Hideaki Shibata; Futoshi Nakamura
    Forest Ecology and Management, 502, 119728, 119728, Elsevier BV, Dec. 2021
    Scientific journal
  • Contribution of conspecific negative density dependence to species diversity is increasing towards low environmental limitation in Japanese forests.
    Pavel Fibich; Masae I Ishihara; Satoshi N Suzuki; Jiří Doležal; Jan Altman
    Scientific reports, 11, 1, 18712, 18712, 21 Sep. 2021, [International Magazine]
    English, Scientific journal, Species coexistence is a result of biotic interactions, environmental and historical conditions. The Janzen-Connell hypothesis assumes that conspecific negative density dependence (CNDD) is one of the local processes maintaining high species diversity by decreasing population growth rates at high densities. However, the contribution of CNDD to species richness variation across environmental gradients remains unclear. In 32 large forest plots all over the Japanese archipelago covering > 40,000 individual trees of > 300 species and based on size distributions, we analysed the strength of CNDD of individual species and its contribution to species number and diversity across altitude, mean annual temperature, mean annual precipitation and maximum snow depth gradients. The strength of CNDD was increasing towards low altitudes and high tree species number and diversity. The effect of CNDD on species number was changing across altitude, temperature and snow depth gradients and their combined effects contributed 11-18% of the overall explained variance. Our results suggest that CNDD can work as a mechanism structuring forest communities in the Japanese archipelago. Strong CNDD was observed to be connected with high species diversity under low environmental limitations where local biotic interactions are expected to be stronger than in niche-based community assemblies under high environmental filtering.
  • Patterns of community composition and diversity in latent fungi of living Quercus serrata trunks across a range of oak wilt prevalence and climate variables in Japan
    Yu Fukasawa; Kimiyo Matsukura; Jörg G. Stephan; Kobayashi Makoto; Satoshi N. Suzuki; Yuji Kominami; Masahiro Takagi; Nobuaki Tanaka; Shuhei Takemoto; Haruo Kinuura; Kunihiro Okano; Zewei Song; Mayuko Jomura; Kohmei Kadowaki; Satoshi Yamashita; Masayuki Ushio
    Fungal Ecology, 101095, 101095, Elsevier BV, Jul. 2021
    Scientific journal
  • Relative importance of climate, vegetation, and spatial factors in the community and functional composition of wood-inhabiting fungi in discontinuously distributed subalpine spruce forests
    Yu Fukasawa; Kimiyo Matsukura; Yoko Ando; Satoshi N. Suzuki; Kunihiro Okano; Zewei Song; Mineaki Aizawa; Daisuke Sakuma
    Canadian Journal of Forest Research, 1, 10, Canadian Science Publishing, 15 Jun. 2021
    Scientific journal, Wood-inhabiting fungi are critically important for the decomposition of coarse woody debris (CWD). To evaluate the relative importance of climate, vegetation, and spatial factors in the functional composition of fungal communities that inhabit CWD in discontinuously distributed subalpine Hondo spruce (Picea jezoensis (Sieb. & Zucc.) Carr. var. hondoensis (Mayr) Rehder) forests, a metabarcoding analysis was conducted on spruce deadwood samples obtained from six subalpine forests in central Japan using a high-throughput DNA sequencing technique. We detected 454 fungal operational taxonomic units (OTUs) from 67 spruce CWDs and determined that spatial factors explained a larger fraction of community variation than environmental (climate and vegetation) factors at all six study sites. However, environmental factors explained a larger fraction than spatial factors if we excluded data from one site that is geographically distant from other study sites. The OTU number and the occurrence of brown-rot fungi were positively associated with mean annual temperature and negatively associated with mean annual precipitation. Similarly, the principal component of forest vegetation significantly affected the OTU number and occurrence of brown-rot fungi. Precipitation seasonality was positively associated with the OTU number of undefined saprotrophs. These results suggest that fungal OTUs belonging to different functional groups respond differently to environmental variables.
  • 山火事後二次林におけるウダイカンバの天然更新施業の現状と課題
    後藤晋; 犬飼浩; 小川瞳; 鈴木智之
    北海道の林木育種, 63, 2, 2021
  • 25-years dynamics of a boreal mixed forest in a 36ha long-term ecological research plot
    小川瞳; 大川あゆ子; 笠原久臣; 鈴木智之
    北方森林研究, 69, 2021
  • Catchment Water Balance in the Chichibu Mountains Consisting of Montane and Subalpine Forest: Validation of the Accuracy of 1 km Mesh Radar-raingauge Analyzed Precipitation and Calculation of Catchment Mean Precipitation
    浅野友子; 鈴木智之
    日本森林学会誌, 103, 2, 2021
  • Effect of Forest Fire on Soil Invertebrates in the University of Tokyo Chichibu Forest
    才木道雄; 鈴木智之
    関東森林研究, 72, 1, 2021
  • Growth records of the Maeyama long-term ecological research plot in the University of Tokyo Hokkaido Forest (1992-2018)
    小川瞳; 芝野伸策; 岡村行治; 高橋康夫; 大川あゆ子; 笠原久臣; 梶幹男; 山本博一; 鈴木智之
    演習林(東京大学大学院農学生命科学研究科)(Web), 63, 2021
  • Impact on Kita-Yatsugatake subalpine coniferous forests estimated from the appearance of sika deer
    小山泰弘; 鈴木智之; 西村尚之
    長野県植物研究会誌, 54, 2021
  • Recent advances in the understanding of ecosystem processes at eddy covariance CO2 flux sites in East Asian forest ecosystems: a review
    Shih-Chieh Chang; Taku M. Saitoh; Hideaki Shibata; Satoshi N. Suzuki
    JOURNAL OF AGRICULTURAL METEOROLOGY, 77, 1, 52, 65, Jan. 2021
    English
  • Acceleration and deceleration of aboveground biomass accumulation rate in a temperate forest in central Japan
    Satoshi N. Suzuki
    FOREST ECOLOGY AND MANAGEMENT, 479, Jan. 2021
    English, Scientific journal
  • Long observation period improves growth prediction in old Sugi (Cryptomeria japonica) forest plantations
    Takuya Hiroshima; Keisuke Toyama; Satoshi N. Suzuki; Toshiaki Owari; Tohru Nakajima; Seiji Ishibashi
    Journal of Forest Research, 25, 3, 1, 9, Informa UK Limited, 29 Apr. 2020, [Peer-reviewed], [International Magazine]
    Japanese, Scientific journal, It is important to predict the growth of Sugi forest plantations in old age. When predictions about the growth of Sugi forest plantations are made and there is a lack of growth data from older trees, it is possible that the accuracy of these predictions becomes worse. For example, it is known that the growth of Sugi does not get slower at older ages as expected from past growth predictions based on growth data from young to middle-aged trees. This study investigated the changes in extrapolated values of diameter at breast height (DBH) in old Sugi forest plantations with changes in the observation period of training data for model calibration. The study sites were long-term growth observation sites of Sugi forest plantations in the University of Tokyo Chiba Forest and Chichibu Forest. In this study, both DBH of individual trees and mean DBH of stands were analyzed by fitting Richards growth functions. The results showed that the accuracy of growth predictions in old ages was improved by including growth data from a sufficient number of older trees. From another point of view, growth prediction in old ages tended to underestimate actual growth if growth data did not include enough older trees.
  • Recovery and allocation of carbon stocks in boreal forests 64 years after catastrophic windthrow and salvage logging in northern Japan
    Wataru Hotta; Junko Morimoto; Takahiro Inoue; Satoshi N. Suzuki; Toshihiro Umebayashi; Toshiaki Owari; Hideaki Shibata; Satoshi Ishibashi; Toshihiko Hara; Futoshi Nakamura
    Forest Ecology and Management, in press, Apr. 2020, [Peer-reviewed]
    English, Scientific journal
  • Effect of disturbance histories on behavior of sika deer in a subalpine coniferous forest in Kita-Yatsugatake
    小山泰弘; 鈴木智之; 西村尚之
    長野県植物研究会誌, 53, 2020
  • Climate influences the effect of fungal decay type on regeneration of Picea jezoensis var. hondoensis seedlings on decaying logs
    Yu Fukasawa; Yoko Ando; Satoshi N. Suzuki; Mineaki Aizawa; Daisuke Sakuma
    Canadian Journal of Forest Research, 50, 73, 79, Jan. 2020, [Peer-reviewed]
    English, Scientific journal
  • How can we quantitatively study insects whose larvae live beneath the forest floor? A case study at an experimental long-term log-removal site in Japan
    Tomonori Tsunoda; Fujio Hyodo; Daisuke Sugiura; Nobuhiro Kaneko; Satoshi N. Suzuki
    ENTOMOLOGICAL SCIENCE, 22, 3, 275, 282, Sep. 2019
    English, 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, Sep. 2019, [Peer-reviewed]
    English, Scientific journal
  • Long-term effects of salvage logging after a catastrophic wind disturbance on forest structure in northern Japan
    Morimoto, J; Umebayashi, T; Suzuki, S.N; Owari, T; Nishimura, N; Ishibashi, S; Shibuya, M; Hara, T
    Landscape and Ecological Engineering, 15, 2, 133, 141, 15 Mar. 2019, [Peer-reviewed], [International Magazine]
    English, Scientific journal, Many reports on the effects of conventional salvage logging—the removal of fallen and damaged trees after a catastrophic windthrow—on subsequent forest restoration have focused on short-term results occurring over less than 20 years; however, this time scale is inadequate, especially for boreal forests, because of the time required for tree growth. Here, we examine the long-term effects of salvage logging after a catastrophic windthrow event in 1954 on the resilience of a boreal forest by assessing the continuous recruitment of coniferous trees, dominance of typical coniferous tree species, and potential for future recruitment. We targeted two regions with different proportions of coniferous trees that were subject to three disturbance and management histories: windthrow (WT: fallen trees left intact), windthrow and salvage (WT+SL: salvage logged after the windthrow), and old growth (OG: not affected by the windthrow). In both regions, past salvaging has had serious negative impacts on the continuous recruitment of coniferous trees and potential for future recruitment. Negative impacts on the dominance of typical coniferous tree species were only observed in mixed forests. Our results suggest that in comparison to the coniferous forest, the mixed forest was less resilient, i.e.; the capability of a forest to maintain its identity as assessed by the dominance and recruitment of typical conifer species after wind disturbance and salvage logging. We found that salvage logging could affect forest structure, even 60 years later, by destroying advanced growth, including potential mother trees, and nursery beds for seedlings of typical conifer tree species.
  • Does typhoon disturbance in subalpine forest have long-lasting impacts on saproxylic fungi, bryophytes, and seedling regeneration on coarse woody debris?
    Yu Fukasawa; Yoko Ando; Yoshitaka Oishi; Satoshi N. Suzuki; Kimiyo Matsukura; Kunihiro Okano; Zewei Song
    Forest Ecology and Management, 432, 309, 318, 15 Jan. 2019, [Peer-reviewed]
    Scientific journal
  • Dead wood offsets the reduced live wood carbon stock in forests over 50 years after a stand-replacing wind disturbance
    Satoshi N. Suzuki; Tomonori Tsunoda; Naoyuki Nishimura; Junko Morimoto; Jun-Ichirou Suzuki
    Forest Ecology and Management, 432, 94, 101, Elsevier BV, Jan. 2019, [Peer-reviewed]
    English, Scientific journal
  • Recruitment drives successional changes in the community-level leaf mass per area in a winter-deciduous broad-leaf forest
    Satoshi N. Suzuki; Toshihide Hirao
    Journal of Vegetation Science, 29, 4, 756, 764, Wiley-Blackwell, 01 Jul. 2018
    English, Scientific journal
  • 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, Elsevier BV, Jul. 2018
    Scientific journal
  • Non-equilibrium dynamics of a wave-regenerated forest subject to hierarchical disturbance
    Satoshi N. Suzuki
    JOURNAL OF VEGETATION SCIENCE, 27, 5, 969, 979, Sep. 2016, [Peer-reviewed]
    English, Scientific journal
  • Long-term dynamics of small fragmented forests inferred from patterns along a gradient of fragment sizes
    Hiroshi Tomimatsu; Hiroki Yamagishi; Satoshi N. Suzuki; Chihiro Sato; Yasuo Konno
    Ecological Research, 30, 6, 1057, 1064, Springer Japan, 01 Nov. 2015
    English
  • Regional-scale directional changes in abundance of tree species along a temperature gradient in Japan
    Satoshi N. Suzuki; Masae I. Ishihara; Amane Hidaka
    GLOBAL CHANGE BIOLOGY, 21, 9, 3436, 3444, Sep. 2015, [Peer-reviewed]
    English, Scientific journal
  • Trap distance affects the efficiency and robustness in monitoring the abundance and composition of forest-floor rodents
    Shinsuke H. Sakamoto; Satoshi N. Suzuki; Chihiro Koshimoto; Yoshinobu Okubo; Takeshi Eto; Ryo O. Suzuki
    JOURNAL OF FOREST RESEARCH, 20, 1, 151, 159, Feb. 2015, [Peer-reviewed]
    English, Scientific journal
  • A hierarchical Bayesian model to estimate the unobservable predation rate on sawfly cocoons by small mammals
    Panisara Pinkantayong; Satoshi Suzuki; Mamoru Kubo; Ken-ichiro Muramoto; Naoto Kamata
    ECOLOGY AND EVOLUTION, 5, 3, 733, 742, Feb. 2015, [Peer-reviewed]
    English, Scientific journal
  • Effect of the site conditions on sapling dynamics of Picea and Abies species in a sub-boreal forest
    西村尚之; 赤路康朗; 鈴木智之; 長谷川成明; 小野清美; 隅田明洋; 原登志彦; 飯田滋生; 関剛; 倉本惠生; 杉田久志; 中川弥智子; 松下通也; 廣部宗; 星野大介; 稲永路子; 山本進一
    低温科学, 73, 7, 19, 北海道大学低温科学研究所 = Institute of Low Temperature Science, Hokkaido University, 2015, [Peer-reviewed]
    Japanese, Research institution, 北方針葉樹林における樹種共存機構を理解するために, 本研究では稚樹段階における林床生育環境に対する生態的応答の種間差について検討した. エゾマツ, アカエゾマツ, トドマツの共存する北海道東大雪にある原生状態の常緑針葉樹林に設置した100m×100m の調査区内において, 樹高が50cm 以上かつ200cm 以下の稚樹個体を対象に2008年と2013年に毎木調査を行い, 2012年に林内441か所で全天写真を撮影し, 個体群動態や成長速度と林床環境との関係を解析した. どの樹種も稚樹の生残や成長にマイクロサイトの影響は小さく, 散乱光または直達光の入射割合の影響が大きかった. エゾマツとトドマツの生残や成長は散乱光の入射割合に, アカエゾマツでは直達光の入射割合に強く影響されており, 北方針葉樹林の樹種共存には稚樹期の光環境の違いが重要であることが結論された.
  • Local-and regional-scale spatial patterns of two fungal pathogens of Miscanthus sinensis in grassland communities
    Suzuki RO; Degawa Y; Suzuki SN; Hosoya T
    Mycoscience, 56, 1, 42, 48, Elsevier, 2015, [Peer-reviewed]
    English, Scientific journal, We studied the spatio-temporal patterns in two fungal pathogens, Sporisorium kusanoi, along with Naemacyclus culmigenus, of the Japanese pampas grass (Miscanthus sinensis) in grassland communities on the Sugadaira plateau, Japan. Their disease symptoms emerged early in June, increased rapidly during the month and peaked early in July. We checked their presence at 11 sites (the regional-scale census) and recorded their presence in 6000 1 × 1-m subplots within a 60 × 100-m area at the specific site (the local-scale census). Sporisorium kusanoi and N. culmigenus were observed at eight and one sites in the regional-scale census, and in 987 and 2708 subplots in the local-scale census, respectively. The respective spatial distributions of S. kusanoi and N. culmigenus aggregated at the spatial scales of 13 m and 33 m. However, the spatial positions of the two fungi were slightly repulsive each other. Our results found that S. kusanoi was widely distributed within the region, whereas N. culmigenus was restricted within the specific site but had a higher frequency compared to S. kusanoi. The contrasting spatial patterns of the two pathogens may reflect differences in their dispersal processes.
  • Spatial variation of local stand structure in an Abies forest, 45 years after a large disturbance by the Isewan typhoon
    Satoshi N. Suzuki; Naoki Kachi; Jun-Ichirou Suzuki
    JOURNAL OF FOREST RESEARCH, 18, 2, 139, 148, Apr. 2013, [Peer-reviewed]
    English, Scientific journal
  • Edge-related changes in tree communities in the understory of mesic temperate forest fragments of northern Japan
    Satoshi N. Suzuki; Hiroshi Tomimatsu; Yoshiko Oishi; Yasuo Konno
    Ecological Research, 28, 1, 117, 124, 2013, [Peer-reviewed]
    English, Scientific journal
  • Seasonal habitat partitioning between sympatric terrestrial and semi-arboreal Japanese wood mice, Apodemus speciosus and A. argenteus in spatially heterogeneous environment
    Shinsuke H. Sakamoto; Satoshi N. Suzuki; Yousuke Degawa; Chihiro Koshimoto; Ryo O. Suzuki
    MAMMAL STUDY, 37, 4, 261, 272, Dec. 2012, [Peer-reviewed]
    English, Scientific journal
  • Nation-wide litter fall data from 21 forests of the Monitoring Sites 1000 Project in Japan
    Satoshi N. Suzuki; Masae I. Ishihara; Masahiro Nakamura; Shin Abe; Tsutom Hiura; Kosuke Homma; Motoki Higa; Daisuke Hoshino; Kazuhiko Hoshizaki; Hideyuki Ida; Ken Ishida; Motohiro Kawanishi; Kazutaka Kobayashi; Koichiro Kuraji; Shigeo Kuramoto; Takashi Masaki; Kaoru Niiyama; Mahoko Noguchi; Haruto Nomiya; Satoshi Saito; Takeshi Sakai; Michinori Sakimoto; Hitoshi Sakio; Tamotsu Sato; Hirofumi Shibano; Mitsue Shibata; Maki Suzuki; Atsushi Takashima; Hiroshi Tanaka; Masahiro Takagi; Naoaki Tashiro; Naoko Tokuchi; Toshiya Yoshida; Yumiko Yoshida
    ECOLOGICAL RESEARCH, 27, 6, 989, 990, Nov. 2012, [Peer-reviewed]
    English, Scientific journal
  • Variability of local spatial structure in a wave-regenerated Abies forest
    Satoshi N. Suzuki; Naoki Kachi; Jun-Ichirou Suzuki
    ECOLOGICAL RESEARCH, 27, 5, 893, 901, Sep. 2012, [Peer-reviewed]
    English, Scientific journal
  • Morphological adaptation of a palatable plant to long-term grazing can shift interactions with an unpalatable plant from facilitative to competitive
    Ryo O. Suzuki; Satoshi N. Suzuki
    PLANT ECOLOGY, 213, 2, 175, 183, Feb. 2012, [Peer-reviewed]
    English, Scientific journal
  • Forest stand structure, composition, and dynamics in 34 sites over Japan
    Masae I. Ishihara; Satoshi N. Suzuki; Masahiro Nakamura; Tsutomu Enoki; Akio Fujiwara; Tsutom Hiura; Kosuke Homma; Daisuke Hoshino; Kazuhiko Hoshizaki; Hideyuki Ida; Ken Ishida; Akira Itoh; Takayuki Kaneko; Kaname Kubota; Koichiro Kuraji; Shigeo Kuramoto; Akifumi Makita; Takashi Masaki; Kanji Namikawa; Kaoru Niiyama; Mahoko Noguchi; Haruto Nomiya; Tatsuhiro Ohkubo; Satoshi Saito; Takeshi Sakai; Michinori Sakimoto; Hitoshi Sakio; Hirofumi Shibano; Hisashi Sugita; Mitsuo Suzuki; Atsushi Takashima; Nobuyuki Tanaka; Naoaki Tashiro; Naoko Tokuchi; Toshiya Yoshida; Yumiko Yoshida
    ECOLOGICAL RESEARCH, 26, 6, 1007, 1008, Nov. 2011, [Peer-reviewed]
    English, Scientific journal
  • Distance-dependent shifts in net effects by an unpalatable nettle on a palatable plant species
    Satoshi N. Suzuki; Ryo O. Suzuki
    ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY, 37, 4, 386, 392, Jul. 2011, [Peer-reviewed]
    English, Scientific journal
  • Facilitative and competitive effects of a large species with defensive traits on a grazing-adapted, small species in a long-term deer grazing habitat
    Ryo O. Suzuki; Satoshi N. Suzuki
    PLANT ECOLOGY, 212, 3, 343, 351, Mar. 2011, [Peer-reviewed]
    English, Scientific journal
  • RELATIONSHIPS BETWEEN PALSAR BACKSCATTERING DATA AND FOREST ABOVE GROUND BIOMASS IN JAPAN
    Takeshi Motohka; Masanobu Shimada; Osamu Isoguchi; Masae I. Ishihara; Satoshi N. Suzuki
    2011 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS), 3518, 3521, 2011, [Peer-reviewed]
    English, International conference proceedings
  • Changes in variance components of forest structure along a chronosequence in a wave-regenerated forest
    Satoshi N. Suzuki; Naoki Kachi; Jun-Ichirou Suzuki
    ECOLOGICAL RESEARCH, 24, 6, 1371, 1379, Nov. 2009, [Peer-reviewed]
    English, Scientific journal
  • Development of a local size hierarchy causes regular spacing of trees in an even-aged Abies forest: Analyses using spatial autocorrelation and the mark correlation function
    Satoshi N. Suzuki; Naoki Kachi; Jun-Ichirou Suzuki
    ANNALS OF BOTANY, 102, 3, 435, 441, Sep. 2008, [Peer-reviewed]
    English, Scientific journal
■ Other Activities and Achievements
■ Books and other publications
■ Syllabus
  • 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
  • Nov. 2021 - Present
    The Society for the Study of Species Biology
  • THE JAPANESE FORESTRY SOCIETY
  • 日本生態学会
■ Research Themes
  • Effect of CWD in forest soil carbon budget
    Grants-in-Aid for Scientific Research
    01 Apr. 2021 - 31 Mar. 2024
    小南 裕志; 鈴木 智之; 深澤 遊; 高木 正博
    森林生態系、特に伐採を伴わない天然性林においては、成長していく樹木も長期的にはいつかは枯死して分解系に供給される。純一次生産量における樹木蓄積炭素量の寄与は30～50%程度を占めるため樹病や風害などの攪乱が発生すると、長期に蓄えられた樹体成長分の炭素が一気に枯死木として分解系に供給されるため、土壌呼吸や長期土壌炭素収支における枯死木の関与は大きい。また、枯死木は小型リターと比較して材内のリグニンなどの難分解性炭素含有率が高いため、その細片化は分解されなかった基質が残って土壌に供給される過程とも考えられ、小型リターとは異なったCO2放出特性と土壌炭素に対する役割を持っている可能性がある。森林攪乱時に発生した枯死木が分解に伴って細片化し、周辺の土壌炭素収支に与える影響を評価するために、全国５サイトで2016年に設置した枯死木サンプル群の周辺で土壌呼吸の空間変動観測を行った。枯死木周辺の土壌呼吸は枯死木の距離と負の相関があり、枯死木直近および枯死木デブリ上で高い傾向が得られた。細片化した枯死木が堆積した位置では従来の土壌呼吸と比較して有意な上昇が見られ、最大で枯死木影響のない地点での最大値の２倍程度の土壌呼吸が観測された。枯死木近傍であっても堆積が見られない場所においては高い呼吸値は得られなかった。極端な土壌呼吸の上昇が見られなかった原因としては細片化する有機物が脱落段階ですでに樹皮などの難分解性部位であることが影響しているためと考えられた。枯死木の発生は森林の局所的な位置に大量の炭素を供給する効果を持っている（投影面積ベースでは1000tC/ha以上）がここから発生する細片化炭素による枯死木フラックスが最大で２倍程度であったことは、細片化炭素が供給される量が十分に多い場所においては、その影響が数十年に及ぶことが考えられた。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Forest Research and Management Organization, 21H02250
  • Are deciduous broad leaved trees increasing in hemiboreal forests? Utilization of data of multiple sites, long-term, and tree-rings
    Grants-in-Aid for Scientific Research
    01 Apr. 2021 - 31 Mar. 2024
    鈴木 智之
    本研究は、世界的に報告されている北方林における落葉広葉樹の増加の普遍性の検証、メカニズムの解明をするために、北海道全域の天然林を対象に、落葉広葉樹率の変化が地理的にどのように起きているのか、20世紀初頭から変化し続けているのか、落葉広葉樹・針葉樹がそれぞれどのように環境変化に応答しているのか、を検証する。そのために、（１）多地点データによる落葉広葉樹率変化の地理的パターンの解析、（２）歴史的資料解析による落葉広葉樹率の20世紀中の変化の解析、（３）年輪データ解析による環境変化応答の落葉樹・針葉樹の比較を行う計画となっている。
    本年度は、（１）については文献調査を行い、関連する先行研究事例やデータを収集した。（２）については、北海道演習林に保管されている資料の整理と情報の収集を行った。また、1960年代以降の毎木測定データを解析した結果、北海道演習林では落葉広葉樹の割合が広域的に増加していた。（３）については、北海道演習林に保管されていた年輪解析資料を数値データ化した。また、2021年に伐採された樹木50本から、年輪を解析するための切断面を円板状に採取した。この採取した円板をスキャナーで画像として取り込み、年輪幅の測定を行った。これらの年輪データを解析し、針葉樹と落葉広葉樹の長期的な幹成長パターンを解析した結果、針葉樹では、過去100年にわたって連続的に成長量が減少している可能性が示唆された。一方で、落葉広葉樹は1980年以前はほとんど減少は見られず、1980年以降に減少する傾向が示された。つまり、針葉樹の成長量の低下が、北方林の落葉広葉樹の増加に関係している可能性がある。今後は、この要因を解明するために、環境要因との関係性の解析や、年輪の安定同位体比の解析を行う必要がある。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), The University of Tokyo, 21K05682
  • 景観スケールにおける亜高山帯針葉樹林の更新に及ぼす風倒撹乱と獣害の相互作用的影響
    科学研究費助成事業 基盤研究(C)
    01 Apr. 2019 - 31 Mar. 2024
    西村 尚之; 小山 泰弘; 鈴木 智之
    本研究は、亜高山帯針葉樹林における風倒撹乱後の人為干渉の差異と近年の獣害の増加が景観スケールにおける林分更新過程に及ぼす影響を評価するために、亜高山帯針葉樹林の更新過程の基礎的情報である実生・稚樹の動態とニホンジカによる食害の程度を把握するための調査を実施することとしている。当該年度の2019年においては、北八ヶ岳の大規模風倒撹乱後の風倒木搬出林分と風倒木残置林分、撹乱後に皆伐された林分、原生状態の林分を対象に、8台の自動撮影カメラを用いてニホンジカの分布動向や行動習性を6月下旬から10月下旬まで記録・調査した。同時にそれらの場所に設定した20m×20m区において、各4個の1㎡方形区の実生調査区を設定して、6月下旬から10月下旬まで当年生実生の消長を追跡調査した。自動撮影カメラの解析の結果、調査地によってニホンジカの出現頻度と滞在時間が大きく異なっていたが、ニホンジカの歩きやすさを左右すると考えられる風倒木処理の有無は出現頻度に影響せず、林床の植生型が出現頻度に関連しており、コケが優占する植生型の林分で出現頻度が少なく、ササ地やイネ科草本型の林分で出現頻度が高いということが明らかとなった。一方、8カ所の林分における針葉樹当年生実生の消長については、前年（2018年）がシラビソ・オオシラビソの結実の豊作年であったこともあり、最大80個体/㎡、平均20個体/㎡の高密度で実生が出現した。出現個体数は8月上旬に最大となり、10月末までに約30%が死亡・消失した。また、2019年の当年生実生の生残率は原生状態の林分で低い傾向があり、特にササの多い林分の生残率が最も低かった。樹種別ではシラビソの出現個体数が最も多く、生残率ではオオシラビソが最も高かった。さらに、当該年度の研究から2019-2020年の冬期中のニホンジカの撮影データの解析、当年生実生の冬期中の生残の解析が可能である。
    日本学術振興会, 基盤研究(C), 群馬大学, 19K06141
  • Next-generation approaches for the conservation of natural landscapes
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    01 Apr. 2020 - 31 Mar. 2023
    齋藤 馨; 鎌田 直人; 藤稿 亜矢子; 中山 雅哉; 後藤 晋; 藤原 章雄; 鈴木 智之; 中村 和彦
    サイバーフォレスト(以下CF)の自然風景地音声映像モニタリングシステムを2021年4月より翌年3月の通年にわたり運用し、ライブ映像音を提供しつつそのアーカイブ公開を継続した。この自然地のデジタルアーカイブ情報とライブ映像音の提供、つまりインターネット上のデジタルな自然情報に、自然地から離れている都市住民が触れることが、自然への意識をどう変化させ、現地に行かずとも自然風景地を保護し利用していると感じられるのか、といった意識変容に関する考察に向けて以下の研究を実施した。
    1．研究協力者随筆家青木奈緒氏は昨年度に続き「森へ」と題した随筆3編を執筆した。文学作品の読者は現地に行かずとも遠隔の自然地に触れることができる。3編を研究分担者と共有し、青木氏との意見交換から自然地の芸術表現に関する定性的な知見を得た。
    2. 2021年5月にオンラインワークショップを開催した。遠隔地の音のみを聴いてその場所の環境を想像し文章で表現させ参加者間で共有した後に現地画像を提示し、想像との共通点相違点の自由記述後に参加者間での議論を行った。これら文字データから定性的な知見を得た。
    3．2021年11月研究協力者サウンドエンジニア岡田晴夫氏が、東京大学北海道演習林前山保存林モニタリング地点および湧水池での自然音体験と録音を実施し、オンライン配信音との比較用データを収集した。
    4．2022年3月学生・院生・若手社会人を対象にオンラインワークショップを開催した。CF概要を説明し、CFのアーカイブ映像を用いたクイズと開花観察等を体験後、グループディスカッションを通してCFの活用アイディア検討を行った。5．同月オンラインシンポジウムを開催し、芸術表現による自然風景地の捉え方とその特徴や意義、効果などについて、芸術家と研究者の双方から話題提供および両者交えての議論を行った。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), The University of Tokyo, 20H03013
  • Effects of forest dieback on CO2 efflux
    Grants-in-Aid for Scientific Research
    01 Apr. 2017 - 31 Mar. 2022
    Fukasawa Yu
    The aim of this study is to evaluate the effects of oak wilt disease (OWD) on fungal community and decomposition of dead stems of Quercus serrata. We selected seven forest stand along latitudinal gradient in Japan to monitor decomposition of newly felled logs of Q. serrata. Metabarcoding of fungal DNA ITS region obtained from newly felled stems showed a positive correlation between fungal specie richness and annual temperature or annual precipitation in forest sites suffered by OWD. However, the correlation was not present in the stand with out OWD. Across the 5-year study period, we obtained substantial data and samples to analyze the long-term effects of OWD on fungal community and wood decomposition.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Tohoku University, 17H03823
  • Adaptation to the Climate Change on Boreal Forest - Ecosystem Management for the Conservation of Ecosystem Resilience
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
    01 Apr. 2017 - 31 Mar. 2021
    Morimoto Junko
    Climate change increases disaster risk and accelerates the degradation of ecosystems. We conducted a comprehensive study on climate change mitigation and adaptation measures for boreal forests, which can be the most severely affected terrestrial ecosystems. Specifically, we focused on typhoon-induced forest collapse (windthrow), which is expected to increase in frequency and intensity due to climate change. We accomplished (1) Development of a windfall risk model with multivariate explanatory variables of weather, topography, and forest to plan artificial forest arrangement to minimize the amount of collapsed timber; (2) Identification of forest management methods to promote forest recovery after windfall based on medium- and long-term observations after windfall; and (3) Development of a model for long-term prediction of forest structure after windfall and various management practices, and proposal of optimal forest management practices.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 17H01516
  • Long-term effects of dead woods on community composition and structure of detritus food web
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    01 Apr. 2017 - 31 Mar. 2020
    Suzuki Satoshi
    The question of this study is “How will removal of downed logs from wind-disturbed forest affect the forest ecosystem long after the disturbance?” We compared species composition of invertebrates and food web structure in the forests where downed logs had been removed just after the wind disturbance due to a super typhoon in 1959 (unremoved sites) with those in the forests not removed (removed sites). Analysis of stable isotope ratio and fatty acids composition of invertebrates and their food sources revealed that downed logs originated from the typhoon is still contributing as a material resource of many species, and that bacterial pathway was increased in in the food web in the unremoved sites compared to the removed sites.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), The University of Tokyo, 17H03732
  • Unraveling the significance of resprouting from trees that are not seriously damaged, considering evolutionary trade-offs and responses to environmental conditions
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    01 Apr. 2017 - 31 Mar. 2020
    Kiyoshi Umeki
    This research focused on the functions and importance of resprouting from trees that are not seriously damaged. More than 700 resprouts in 60 plots in a forest landscape with a relatively large range in elevation (ca. 1,000 m) were tagged and their demographic processes were recorded. The functional traits of the target species and environmental conditions of the plots were measured to investigate the evolutionary tradeoffs between resprouting and the traits, and responses of resprouting to the environmental conditions. Using these data, we analyzed the number of resprouts per stems, and clarified the indirect causal relationship between resprouting and dominance in forests, the resprouting responses to environmental conditions, and the effect of functional traits on resprouting.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Chiba University, 17K07834
  • Long-term effects of large-scale windthrow disturbance on forest carbon stock and stand dynamics
    Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
    Apr. 2013 - Mar. 2017
    Suzuki Satoshi
    This study explored effects of a large scale windthrow by the Isewan typhoon in 1959 on current carbon stocks and dynamics of subalpine forests. Carbon stocks were measured in forests where downed trees had been salvaged just after the windthrow (salvaged), those not salvaged (unsalvaged), and those where no windthrow had occurred (undamaged). Carbon stocks of live trees in unsalvaged sites were not significantly different from those in salvaged sites, and 74% of those of undamaged sites. Carbon stocks of downed logs in unsalvaged sites were 340% and 630% of those in undamaged and sites, respectively. Stand-level carbon stocks were ca. 120 Mg C/ha in average in unsalvaged and undamaged sites, whereas those in salvaged sites were 88 Mg C/ha. In conclusion, unsalvaged sites sustain carbon stocks equivalent to undamaged sites due to their large amount of downed logs, and the carbon stocks had been reduced by 27% due to the salvage logging that been carried out over a half century ago.
    Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), The University of Tokyo, Principal investigator, Competitive research funding, 25870286
  • 森林樹木群集の構造と動態の地理的パターン
    2010
    Competitive research funding
  • 十勝平野の分断化された森林群集の構造
    2007
    Competitive research funding
  • シラビソ・オオシラビソ林の森林動態
    2004
    Competitive research funding