Refine your search:     
Report No.

Forest type effects on the retention of radiocesium in organic layers of forest ecosystems affected by the Fukushima nuclear accident

Koarashi, Jun  ; Atarashi-Andoh, Mariko ; Matsunaga, Takeshi; Sanada, Yukihisa  

Forest-floor organic layers play a key role in controlling the overall bioavailability of $$^{137}$$Cs in forest ecosystems; however, there is still an insufficient understanding of how forest types influence the retention capability of $$^{137}$$Cs in organic layers in Japanese forest ecosystems. Here we conducted plot-scale investigations on the retention of $$^{137}$$Cs in organic layers at two contrasting forest sites in Fukushima. In a deciduous broad-leaved forest, approximately 80% of the deposited $$^{137}$$Cs migrated to mineral soil located below the organic layers within two years after the accident, with an ecological half-life of approximately one year. Conversely, in an evergreen coniferous forest, more than half of the deposited $$^{137}$$Cs remained in the organic layers, with an ecological half-life of 2.1 years. The observed retention behavior can be well explained by the tree phenology and accumulation of $$^{137}$$Cs associated with litter materials with different degrees of degradation in the organic layers.



- Accesses




Category:Multidisciplinary Sciences



[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.