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Radiocesium transfer from forest catchment to freshwater fish living in mountain streams estimated from environmental monitoring data in Fukushima Prefecture

福島県における環境モニタリングデータから推定される森林流域から渓流魚への放射性セシウムの移行

操上 広志  

Kurikami, Hiroshi

放射性セシウムの森林内の動態と渓流魚セシウム濃度の関係をモデルと環境モニタリングデータを利用して解析した。その結果、森林中のセシウム源は時間とともに変化することがわかった。事故後数年は河川への直接落葉と林床リター層が主要なセシウム源であり渓流魚セシウム濃度の早い低下に寄与した。その後、セシウム源はリター層の下位にある有機土壌層へと変化してきた。

The relationship between radiocesium migration in forest and fish contamination was analyzed by using a model and environmental monitoring data. As the result, it was estimated that radiocesium sources in forest transferred to fish were changing with time. In the first several years after the accident, the main sources were leaves that fell directly into rivers and litter layer of the forest floor, which led the fast decrease of radiocesium concentration in fish. After the period, the main source was switched to the organic soil underlying the litter layer.

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