| Budget Amount *help |
¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2020: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2019: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2017: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2016: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Outline of Final Research Achievements |
In permafrost black spruce stands on a north facing slope in Interior Alaska, litterfall production rates and fine root growth rates were examined. Our results showed that litterfall production rates were greater at upper slope, where active layer depth was greater than at lower slope. On the other hand, fine root growth rates were similar among the plots across the slope positions, suggesting that allocation to fine roots was greater at lower slope than at upper slope. Fine root growth rates of black spruce trees were greater at upper slope than at lower slope, whereas those of understory plants were greater at lower slope in contrast. These results indicated that contribution of understory plants to fine root growth was greater than that of black spruce trees at lower slope, where active layer depths were shallower. Taken together, this study suggest that understory plants play a key role in belowground carbon dynamics at environments with shallower active layer depths.
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