New Diagrams to Evaluate Soil Pore Radius Distribution and Saturated Hydraulic Conductivity of Forest Soil
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概要
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Based on the widely used soil pore classification systems, soil pore ratios α, β, and γ Were derived. α, β, and γ represent ratios of the fine capillary porosity, coarse capillary porosity, and non-capillary porosity to the effective porosity, respectively. The parameters ψ_m and σ of the soil water retention model developed by Kosugi were related to these pore ratios, and a simple method was suggested to estimate ψ_m and σ from measured soil pore ratios. By analyzing the observed retention data sets of forest soils, it was shown that the soil pore ratios are effectively used to evaluate the soil pore radius distribution. A coordinate system with log(-ψ_m) on the abscissa and σ on the ordinate, which represents the constant α, β, and γ lines, was developed as a new diagram to evaluate the soil pore radius distribution in connection with the soil water retention characteristic. Then, the saturated hydraulic conductivity K_s of forest soils was correlated with the parameters ψ_m and σ, and with the ratios α, β, and γ using the coordinate system and the triangle diagram. Results showed that K_s is higher for the soil with a greater median and with a greater width of the pore radius distribution, K_s increases as the non-capillary pore ratio γ becomes greater and the coarse capillary pore ratio β becomes smaller. Functional relationships between K_s and the water retention parameters, and between K_s and the soil pore ratios were derived based on Mualem's model.
- 一般社団法人日本森林学会の論文
- 1997-03-16