Effects of Subsoil Breaking on Surface Runoff, Pressure Head and Soil Temperature in a Sloping Field

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  • Moroizumi Toshitsugu
    Faculty of Environmental Science and Technology, Okayama University
  • Sato Yuichi
    School of Veterinary Medicine and Animal Sciences, Kitasato University
  • Sato Koichi
    School of Veterinary Medicine and Animal Sciences, Kitasato University
  • Miura Takeshi
    Faculty of Environmental Science and Technology, Okayama University

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Other Title
  • 心土破砕が傾斜畑の表面流出量と圧力水頭•地温に与える影響
  • 心土破砕が傾斜畑の表面流出量と圧力水頭・地温に与える影響
  • シンド ハサイ ガ ケイシャバタ ノ ヒョウメン リュウシュツリョウ ト アツリョクスイトウ チオン ニ アタエル エイキョウ

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Abstract

This paper discusses the effects of subsoil breaking on the change of pressure head, soil temperature and runoff discharge in space and time in a sloping field. A controlled comparison experiment was conducted in a subsoil breaking field and a no-subsoil breaking field. The results showed that the runoff ratio of the subsoil-breaking field was about 1/10 of that in the no-subsoil breaking field. This indicates that subsoil breaking promotes the infiltration of rainfall into the soil and can reduce the surface runoff discharge. The spatial distribution of the equi-pressure heads during rainfall was complicated, and the coefficients of variation were large. However, that of the equi-pressure heads before and after rainfall showed the similar patterns of variation in both fields. As for soil temperatures, we didn’t observe a large difference between the subsoil breaking field and the no-subsoil breaking field, and the spatial variation was smaller than that of the pressure head.

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