Potential soil water repellency in the Ochozu Experimental Watershed dominated by a Japanese cypress (Chamaecyparis obtusa) plantation

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  • Ide Jun'ichiro
    International Research Center for River Basin Environment, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
  • Mori Yasushi
    Faculty of Life and Environmental Science, Shimane University
  • Otsuki Kyoichi
    Kasuya Research Forest, Kyushu University

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Other Title
  • ヒノキ人工林を主体とする御手洗水試験流域における土壌の潜在的な撥水性について
  • ヒノキ ジンコウリン オ シュタイ ト スル オチョウズ シケン リュウイキ ニ オケル ドジョウ ノ センザイテキ ナ ハッスイセイ ニ ツイテ

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To evaluate the spatial variability of potential soil water repellency in the Ochozu Experimental Watershed dominated by a Japanese cypress (Chamaecyparis obtusa) plantation, 'Molarity of an Ethanol Droplet' test was examined for soil samples collected at the upper, middle, lower and bottom parts of east-facing hillslope in the watershed. Ptential soil water repellency was observed for the surface soils (0-2 and 2-5 cm depths) at the upper, middle and lower parts and their strengths of water repellency ranged from 'none' to 'very strong'. On the other hand, potential soil water repellency was not observed for the soils at the bottom part. It was observed by eye that the soil samples of stronger water repellency appear to include larger amounts of litter leaves of Japanese cypress. Therefore, it is predicted that the content of litter leaves of Japanese cypress in the soils is a critical factor causing soil water repellency in a Japanese cypress plantation.

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