Effects of the litter layer on the control of infiltration and soil evaporation

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  • Sato Y.
    University Forests, Faculty of Agriculture, Kyushu University
  • Kumagai T.
    University Forests, Faculty of Agriculture, Kyushu University
  • Ogawa S.
    University Forests, Faculty of Agriculture, Kyushu University

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  • リター層による雨水遮断と土壌蒸発抑制
  • リターソウ ニ ヨル ウスイ シャダン ト ドジョウ ジョウハツ ヨクセイ

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Abstract

In order to understand the mechanism of evaporation from a forest floor (EFF), EFF was measured as the sum of evaporation from the litter layer (ELL) plus evaporation from the mineral soil (EMS). A microlysimeter was used to measure the amount of evaporation from each part to estimate the covering effect of the litter layer. The results were as follows: (1) ELL varied according to the thickness of the litter layer when it was saturated, and was regulated by residual water in the litter layer when it was unsaturated. (2) The litter layer decreased EMS in proportion to the thickness of the litter layer. At an early stage in the experimental period, it became apparent that it was impossible to estimate the effect of cover with a litter layer, which was defined by Tamai and Hattori (1994). (3) The thickness of the litter layer had no significant effect on the EFF when it was saturated.

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