| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Outline of Final Research Achievements |
Nutrient resorption before leaf abscission is an important trait as an adaptive strategy for trees growing on nutrient limited environment. To clarify variation in leaf nutrient resorption at the species level along the gradient of soil nutrient availability, we collected green and senesced leaves from tree canopies in tropical heath forest growing on nutrient-poor soil (podzol) and other forest types on non-podzolic soils including typical mixed dipterocarp forest in Sabah, Borneo. Leaf nitrogen and phosphorus resorption efficiencies of dominant species were higher in the heath forest stands, compared with those in the forest stands on non-podzolic soils. The resorption efficiencies also varied within heath forest stands. Our results demonstrate that the dominant species in our study sites adapt to the soil nutrient availability in each forest type by having different nutrient (nitrogen and phosphorus) resorption traits.
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