Methods for Measuring Iinfiltration Rate in Forest Floor in Hinoki Plantations

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  • ONDA Yuichi
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • TSUJIMURA Maki
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • NONODA Toshiro
    Forestry Research Division, Mie Prefectural Science and Technology Promotion Center
  • TAKENAKA Chisato
    Graduate School of Bioagricultural Sciences, Nagoya University

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  • 荒廃したヒノキ人工林における浸透能測定法の検討
  • コウハイ シタ ヒノキ ジンコウリン ニ オケル シントウノウ ソクテイホウ ノ ケントウ

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Abstract

In unmanaged Hinoki plantations, understory vegetation decreases because of low light conditions, and forest surface becomes a bare land and occurrence of overlandflow and soil erosion has been reported. In this study, we measured infiltration rates by means of three different infiltration measuring methods for better estimation of actual infiltration rate in unmanaged Hinoki plantations. We have compared three methods for measuring infiltration rate in Hinoki plantations; a) a single ring infiltrometer with diameter of 11cm, b) a mist type sprinkler, and c) a large-scale rainfall simulator type with the sprinkler locate above the tree crown. The mist-type sprinkler employs splaying tubes, having 0.18-mm diameter openings. The infiltration rate by the large-scale infiltrometer produced lower values (26-34 mm/h) than values measured by the other two methods (250-460 mm/h), suggesting that the infiltration rate in unmanaged Hinoki plantation can be correctly measured by the large scale experiment.

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