| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2014: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
We investigated the factors controlling the seasonal variation in water and carbon exchanges between forest canopy and atmosphere at a deciduous tropical seasonal forest having clear rainy and dry seasons in Southeast Asia based on long-term in-situ observations. Soil moisture increase worked as a dominant factor of leaf-out and transpiration onset. Leaf-fall and the clear decline in leaf photosynthetic capacity (quantitative and qualitative leaf phenology, respectively) were not observed in the beginning of dry season, while the stomatal closure due to soil drought (physiological response to environmental condition) induced the beginning of transpiration decline and the increase in net ecosystem exchange. These indicate that soil moisture change caused by the rainfall seasonality plays an important role on seasonal variations in water and carbon exchanges through leaf-out and stomatal control.
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