01 - Movement of radiocesium as litterfall in deciduous broad leaved forests with special reference to litter origin compost production

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Litterfall is important agent in the process of radiocesium (RCs) movement from tree canopy to forest floor in forest ecosystems, and for litter origin compost production, however, the information on the relationships between them is limited. We clarified the process of radiocesium movement in Konara oak (Quercus serrata) coppice forests after the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident for seven years in three studied sites with different RCs deposition level, and also predicted the time of resume of foliar litter collection for the compost production. RCs concentration of foliar litter is getting lower according to the level of RCs initial deposition, and also lower than that of A0 layer in three sites. The level of RCs deposition to forest floor (Ao) depends on that of initial RCs deposition, and the difference of RCs concentration between foliar litter and A0 layer is caused by that of the initial deposition. Seasonal concentration of RCs in living leaf and branches in the canopy in 2015 showed the highest value in April and May, and the values are getting a decrease in living leaves and an increase in living branches in defoliation period. This suggested the transfer of RCs from flushing to defoliation is limited within the part of the branch. RCs concentration of A0 layer on the forest floor is fitted by negative exponential decay curve, and the availability of foliar litter for litter origin compost production after the FDNPP accident is predicted by the level of initial RCs deposition.