Interactions between water cycle mechanisms and vegetation resilience in tropical rainforest ecosystems

• Project/Area Number: 18H02239
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 40010:Forest science-related
• Research Institution: Kyoto University
• Principal Investigator: Kosugi Yoshiko 京都大学, 農学研究科, 教授 (90293919)
• Co-Investigator(Kenkyū-buntansha): 中路 達郎 北海道大学, 北方生物圏フィールド科学センター, 准教授 (40391130) ; 伊藤 雅之 兵庫県立大学, 環境人間学部, 准教授 (70456820) ; 野口 正二 国立研究開発法人国際農林水産業研究センター, 林業領域, 領域長 (90343780) ; 高梨 聡 国立研究開発法人森林研究・整備機構, 森林総合研究所, 主任研究員 等 (90423011)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000); Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2020: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2019: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2018: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
• Keywords: 東南アジア / 水循環機構 / 植物水分生理 / 生態系フラックス / 低地フタバガキ林

Outline of Final Research Achievements

In a Southeast Asian tropical rainforest (Pasoh Forest Reserve, a lowland dipterocarp forest in Peninsular Malaysia), continuous observation of ecosystem fluxes and various environmental conditions revealed that evapotranspiration and canopy photosynthetic activities are very stable over a long period of time. We also analyzed the mechanism of the resilience, and found that the deep unsaturated zone soils in this forest, which is at the edge of rainfall conditions for a tropical rainforest, provide a water reservoir to maintain stable evapotranspiration, but during dry periods, most of the available water in the unsaturated zone soils is used, We also found that the tree survival strategy is usually to control transpiration with a strict stomatal opening/closing pattern.

Academic Significance and Societal Importance of the Research Achievements

熱帯雨林機能の評価と未来予測は重要な課題であるが、どちらも限られた実測データに基づくモデリングに頼っているのが現状である。本研究は、熱帯雨林に蒸発散や光合成の安定性を保つどのようなメカニズムと限界が存在するのかを明らかにしたもので、モデル構築の際の重要な情報源である。水のフローは炭素をはじめ様々な物質のフローとも関係して熱帯雨林機能の中枢をなし、全球環境とも深く結びついているため、本研究で得られる知見は、熱帯雨林機能の未来予測を行う上で重要な意義を持つものである。

Research Products

• [Journal Article] Assessing the changes in river water quality across a land-use change (forest to oil palm plantation) in peninsular Malaysia using the stable isotopes of water and nitrate (2023)
  • Author(s): Masayuki Itoh, Ken'ichi Osaka, Kotaro Iizuka, Yoshiko Kosugi , Marryanna Lion, Satomi Shiodera
  • Journal Title: Science of The Total Environment Volume: 859 Pages: 160319-160319
  • DOI: 10.1016/j.scitotenv.2022.160319
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Temporal fluctuation of patchy stomatal closure in leaves of <i>Dipterocarpus sublamellatus</i> at upper canopy in Peninsular Malaysia over the last decade (2021)
  • Author(s): Kamakura Mai、Kosugi Yoshiko、Takanashi Satoru、Matsuo Naoko、Uemura Akira、Lion Marryanna
  • Journal Title: Tropics Volume: 30 Issue: 3 Pages: 41-51
  • DOI: 10.3759/tropics.MS21-05
  • NAID: 130008123410
  • ISSN: 0917-415X, 1882-5729
  • Year and Date: 2021-12-01
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Estimation of six leaf traits of East Asian forest tree species by leaf spectroscopy and partial least square regression (2019)
  • Author(s): Nakaji Tatsuro、Oguma Hiroyuki、Nakamura Masahiro、Kachina Panida、Asanok Lamthai、Marod Dokrak、Aiba Masahiro、Kurokawa Hiroko、Kosugi Yoshiko、Kassim Abdul Rahman、Hiura Tsutom
  • Journal Title: Remote Sensing of Environment Volume: 233 Pages: 111381-111381
  • DOI: 10.1016/j.rse.2019.111381
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Surface conductance for evapotranspiration of tropical forests: Calculations, variations, and controls (2019)
  • Author(s): Zheng-Hong Tan, Jun-Fu Zhao, Guan-Ze Wang, Meng-Ping Chen, Lian-Yan Yang, Chun-Sheng He, Natalia Restrepo-Coupe, Shu-Shi Peng, Xue-Yan Liu, Humberto R. da Rocha, Yoshiko Kosugi, Takashi Hirano, Scott R. Saleska, Michael L. Goulden, Jiye Zeng, Fang-Jun Ding, Fu Gao, Liang Song
  • Journal Title: Agricultural and Forest Meteorology Volume: 275 Pages: 317-328
  • DOI: 10.1016/j.agrformet.2019.06.006
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Spatial distribution of soil moisture and its influence on stand stracture in a lowland dipterocarp forest in peninsular Malaysia (2019)
  • Author(s): Marryanna, L., Noguchi, S., Kosugi, Y., Niiyama, K., Itoh, M., Sato, T., Takanashi S., Siti-Aisha, S., Abd Rahman, K.
  • Journal Title: Journal of Tropical Forest Science Volume: 31 Pages: 135-150
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Memory effects of climate and vegetation affecting net ecosystem CO2 fluxes in global forests (2019)
  • Author(s): Besnard S., Carvalhais, N., Altaf Arain, M., Black, A., Brede, B., Buchmann, N., Chen, J., Clevers, J. G. P. W., Dutrieux, L. P., Gans, F., Herold, M., Jung, M., Kosugi, Y., Knohl, A., Law, B. E., Paul-Limoges, E., Lohila, A., Merbold, L., Roupsard, O., Valentini, R., Wolf, S., Zhang, X., Reichstein, M.
  • Journal Title: PLoS ONE Volume: 14 Issue: 2 Pages: e0211510-e0211510
  • DOI: 10.1371/journal.pone.0211510
  • NAID: 120006630977
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Drought and cool temperature cue general flowering synergistically in the aseasonal tropical forests of Southeast Asia (2019)
  • Author(s): Satake, A., Yu-Yun Chen, Fletcher, C., Kosugi, Y.
  • Journal Title: Ecological Research Volume: 34 Pages: 40-49
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] 半島マレーシア熱帯雨林Pasoh森林保護区における降水・流出水起源の推定 (2020)
  • Author(s): 緒方澄人・小杉緑子・伊藤雅之・渡辺伸一・勝山正則・野口正二・高梨聡・Marruanna Lion
  • Organizer: 第131回日本森林学会大会
• [Presentation] 熱帯低地林におけるフタバガキ科高木種の水利用特性 (2020)
  • Author(s): 東若菜、野口結子、鶴田健二、鎌倉真依、小杉緑子、Marryanna Lion
  • Organizer: 第131回日本森林学会大会
• [Presentation] 東南アジア熱帯雨林における蒸発散に寄与する土層深についての水文学的解析 (2019)
  • Author(s): 小杉緑子、野口正二、高梨聡、伊藤雅之、Marryana Lion
  • Organizer: 日本森林学会
• [Presentation] 熱帯雨林における蒸発散の恒常性について (2018)
  • Author(s): 小杉緑子、高梨聡、野口正二、伊藤雅之、中路達郎、鎌倉真依、東若菜、Siti Aisha Shumsuddin、Marryana Lion
  • Organizer: 水文・水資源学会
• [Presentation] Are the evapotranspiration and canopy photosynthesis of Asian tropical rainforests affected by climate change? (2018)
  • Author(s): Yoshiko Kosugi, Satoru Takanashi, Shoji Novughi, Tatsuro Nakaji, Mai Kamakura, Wakana Azuma, Siti Aisha Shumsuddin and Marryanna Lion
  • Organizer: The 3rd Asia Research Node Symposium on Humanosphere Science
  • Int'l Joint Research / Invited
• [Book] 森林と水 (2022)
  • Author(s): 三枝 信子、柴田 英昭、高梨 聡 編
  • Total Pages: 208
  • Publisher: 共立出版
  • ISBN: 9784320058217