Effects of the Slope Aspect and Leaf Mass on the Radiocesium Spatial Distribution of Fallen Leaves of <i>Quercus serrata</i>

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  • Naoe Shoji
    Forestry and Forest Products Research Institute
  • Abe Shin
    Forestry and Forest Products Research Institute
  • Tanaka Hiroshi
    Forestry and Forest Products Research Institute
  • Akama Akio
    Forestry and Forest Products Research Institute
  • Takano Tsutomu
    Forestry and Forest Products Research Institute
  • Yamazaki Yoshihiro
    Laboratory of Forest Biology, Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University
  • Fujitsu Akiko
    Graduate School of Agriculture, Tokyo University of Agriculture and Technology
  • Harasawa Shota
    Laboratory of Forest Biology, Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University
  • Masaki Takashi
    Forestry and Forest Products Research Institute

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Other Title
  • コナラ落葉に含まれる放射性セシウムの空間分布に斜面方位と落葉量が与える影響
  • コナラ オチバ ニ フクマレル ホウシャセイ セシウム ノ クウカン ブンプ ニ シャメン ホウイ ト オチバリョウ ガ アタエル エイキョウ
  • Effects of the slope aspect and leaf mass on the radiocesium spatial distribution of fallen leaves of Quercus serrata

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<p>In this study, we evaluated the spatial distribution of radiocesium in a forest and explored its causal factors. We set 61 litter traps and collected the fallen leaves of a dominant tree species, Quercus serrata, in a deciduous broad-leaved forest in 2011 and 2012. Then we examined relationships between the radiocesium of fallen leaves and the aspect, gradient of slope, leaf mass. The spatial distribution of radiocesium in the fallen leaves was not uniform in 2011: radiocesium concentrations in fallen leaves were higher at the east-facing slope compared to those at the west-facing one, and were higher at sites with higher leaf mass. Although the spatial bias was smaller in 2012, the same tendency was observed. Eastward wind direction at the study site when massive radiocesium was emitted from the Fukushima Daiichi Nuclear Power Plant was considered as one of the reasons for the phenomenon.</p>

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