Soil moisture regime of a dried forest soil in a broad-leaved forest in southern part of Izu Peninsula : Decrease in soil wettability by a temporal intense aridity and its effects on soil moisture regime

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  • Kajiura Masako
    Graduate School of Agricultural and Life Sciences, University of Tokyo
  • Etori Yoshie
    Graduate School of Agricultural and Life Sciences, University of Tokyo:(Present office)YKK AP Inc.
  • Tange Takeshi
    Graduate School of Agricultural and Life Sciences, University of Tokyo

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Other Title
  • 南伊豆の広葉樹林における乾性土壌の水分環境 : 一時的な強度の乾燥に伴う吸水性の低下とその影響
  • ミナミイズ ノ コウヨウジュリン ニ オケル カンセイ ドジョウ ノ スイブン カンキョウ イチジテキ ナ キョウド ノ カンソウ ニ トモナウ キュウスイセイ ノ テイカ ト ソノ エイキョウ

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Abstract

In order to clarify a feature of soil moisture regime in a dried forest soil in a humid-temperate region, we periodically observed matric potential and volumetric water contents of soil at a depth of a boundary of surface and subsurface soils in dried to mesic soils in a broad-leaved forest in southern part of Izu Peninsula. In a dried brown forest soil (B_B type soil), after soil intensely dried (-0.16MPa) in summer we observed decrease of soil wettability and hysteresis in soil water characteristic curves, where volumetric soil water contents less changed by rainfalls. Strongly dry condition lasted until winter. In a mesic brown forest soil (B_<D(d)> type soil) on a ridge, we found neither the decrease in soil wettability and hysteresis nor the intensely dry condition lasting until winter. Decrease in soil wettability after intense aridity may play an important role on B_B type soil formation in a humid-temperate region.

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