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Report No.

An Effect of forest floor condition on radiocesium outflow in mountainous forest of Fukushima, Japan

Niizato, Tadafumi  ; Sasaki, Yoshito ; Watanabe, Takayoshi ; Amamiya, Hiroki*

A three-year monitoring of $$^{137}$$Cs outflow associated with soil erosion from decontaminated and burnt sites using an experimental plot was conducted in a mountainous forest of Fukushima, Japan. Corresponding with recovery of the forest floor cover, such as undergrowth and litter layer, the $$^{137}$$Cs outflow during the monitoring period in the rainy season of Fukushima decreased from 3.24% to 0.61% and 2.79% to 0.03% in the decontaminated and burnt sites, respectively. The forest floor cover ratio of 60% or more is a threshold for an effect on the $$^{137}$$Cs outflow in the monitoring sites. In the burnt site, a change of dominant outflowed materials from soil particles into litter and its fragments also contributes to the decreasing in the $$^{137}$$Cs outflow. A protective function of forest floor cover against the soil erosion inherent in the natural forest environment is effective for the migration control of the $$^{137}$$Cs outflow.



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