New diagrams to evaluate soil pore radius distribution and saturated hydraulic conductivity of forest soil |
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| Authors: | Ken'ichirou Kosugi |
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| Institution: | (1) Faculty of Agriculture, Kyoto University, 606-01 Kyoto, Japan |
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| Abstract: | 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 parametersψ
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 estimateψ
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 conductivityK
s
of forest soils was correlated with the parametersψ
m
and σ, and with the ratios α, β, and γ using the coordinate system and the triangle diagram. Results showed thatK
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 betweenK
s
and the water retention parameters, and betweenK
s
and the soil pore ratios were derived based on Mualem's model.
The title is tentative translation from the original Japanese title by the author of this paper. |
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| Keywords: | forest soil hydraulic conductivity lognormal distribution pore radius distribution water retention curve |
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