2023 Fiscal Year Final Research Report
Understanding the mechanism in paradox of tropical seasonal forest: does climate change affect its sustainability?
| Project/Area Number |
19K06135
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 40010:Forest science-related
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| Research Institution | Forest Research and Management Organization |
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Principal Investigator |
Iida Shin'ichi 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 (70375434)
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| Co-Investigator(Kenkyū-buntansha) |
山中 勤 筑波大学, 生命環境系, 教授 (80304369)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | 熱帯季節林 / 吸水深度 / 蒸散量 / 植物季節 |
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| Outline of Final Research Achievements |
Transpiration activities in a tropical dry forest were confirmed after the early leaf flush in the dry season. Especially in 2020, in which soil was driest among 11 years (2010-2020), trees exhibited early leaf flush and kept transpiration during the dry season. However, 50% decreases in transpiration, that is, occurrence of water stress, was measured. Stable isotope analysis of branch water implied the possibility of water uptake by root system from >120 cm depth. Our measurements revealed that extreme droughts caused by El Nino-Southern Oscillation declined transpiration, but trees kept photosynthetic activity through water uptake from deeper part of soil. Additional observations are required to evaluate the effect of increasing frequency of extreme drought.
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| Free Research Field |
水文学、生態水文学、森林水文学
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| Academic Significance and Societal Importance of the Research Achievements |
インドシナ半島の熱帯季節林は経済活動の発展等によって減少しているが、カンボジアには天然林が残存しており、貴重な生態系となっている。本研究によって、厳しい乾燥条件下で早い展葉を行うこと、また異常乾燥時には蒸散量が大きく減少するが、土壌深部からの吸水によって生命活動を維持することが明らかとなった。このことは、同生態系の保全策の検討に科学的知見を供給するのみならず、気候変動によって頻発が懸念される異常乾燥による影響について、今後、植物生理学的検討も含めた評価を早急に実施する必要性を示すものである。
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