Soil moisture regime of a dried forest soil in a broad-leaved forest in southern part of Izu [Japan] Peninsula: Decrease in soil wettability by a temporal intense aridity and its effects on soil moisture regime
2010
Kajiura, M., Tokyo Univ. (Japan) | Etori, Y. | Tange, T.
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 (Bsub(B) type soil), after soil intensely dried (- 0.16 MPa) 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 (Bsub(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 Bsub(B) type soil formation in a humid-temperate region.
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