Radioactivity reduction experiment and the subsequent erosion in broadleaf hill forest after Fukushima ⅠNPP accident

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  • 原発事故被災地の丘陵地広葉樹斜面林における林床放射能低減試験とその後の水土流出
  • ゲンパツ ジコ ヒサイチ ノ キュウリョウチ コウヨウジュ シャメンリン ニ オケル リンショウ ホウシャノウ テイゲン シケン ト ソノゴ ノ スイド リュウシュツ

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Abstract

O horizon removal experiment was performed in broadleaf hill forest which had been extremely contaminated after Fukushima Daiichi Nuclear Power Plant accident. Soil 137Cs decreased to 13.7 % and air radiation decreased to 47.7 % in L-F-H horizon removed plot while air radiation dose decreased to 73∼76 % in L-F horizon removed plot. After the removal treatment, 9.65 % of 137Cs in forest floor had been washed away in L-F-H horizon removed plot during about 5 month. It was 0.64∼0.69 % in L-F horizon removed plot and 0.08 % in control plot. More than 96 % of these flown 137Cs erosion was trapped with fence at the bottom edge of plots. Concentration of dissolved 137Cs which is taken into plants easily was 9.5 Bq/L in control plot, 3.6∼6.5 Bq/L in L-F horizon removed plot and 2.1 Bq/L in whole L-F-H horizon removed plot.

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