| Budget Amount *help |
¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
Fiscal Year 2014: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2013: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2012: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
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| Outline of Final Research Achievements |
We focused on the upward transport of radiocesium in forest ecosystem. One possible process of upward transport is microbiological activity in litter layer. We conducted litter-bag experiments in Japanese cedar and deciduous forests in Fukushima prefecture. As the results, we found that the contribution of deposition from above-ground parts in forest was larger than the upward transport of radiocesium by microorganisms. We planted seedlings of various tree species in the contaminated soils of nursery and confirmed the root uptake of radiocesium. The radiocesium amounts absorbed by roots were very small comparing with the results in a forest site reported by Iizuka (personal communication). The low absorption ability of trees should be due to the different soil conditions. In conclusion, it is difficult to estimate the upward movement of radiocesium at present time, because the situation of radiocesium dynamics in forest ecosystem has not reached to a steady state.
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