Seasonal Variations of Radioactive Cesium Contamination in Cultivated <i>Petasites japonicus</i>

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  • 栽培フキ（<i>Petasites japonicus</i>）の放射性セシウム汚染の季節変化
  • 栽培フキ(Petasites japonicus)の放射性セシウム汚染の季節変化
  • サイバイ フキ(Petasites japonicus)ノ ホウシャセイ セシウム オセン ノ キセツ ヘンカ

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To determine the seasonal changes in radioactive cesium (Cs) doses present in the aboveground organs of Petasites japonicus, we collected organ samples each month from March 2013 to October 2013 and from March 2014 to July 2014, and collected litter and surface soil (0-5 cm in depth) in March 2014 in two planted sites, HO and TS plots, in Ibaraki Prefecture. The 137Cs doses of the lamina and leafstalk were high in March when scapes existed and were reduced in May when stand leaf biomass became large. The dose increased again by late summer when biomass decreased in the HO plot, whereas such increase of the dose did not occurred in the TS plot. Neither the air dose rate of radioactivity nor the radioactive Cs deposition in litter and surface soil significantly differed between the two plots. However, the HO plot had overstory trees with approximately three times the total of litter accumulation, accompanied by three times the 137Cs dose, compared with that in the TS plot. The differences in the conditions of overstory trees and litter may explain the seasonal differences in the leaf 137Cs dose between the plots.

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