Inverse estimation of effective hydraulic properties of forest soils

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Soil water content and flux were measured in Hinoki plantation forests with different soil types. Using observed data we conducted inverse estimations for "effective" hydraulic properties of the soils under rainfall. The estimated saturated water content of well-structured soil became very small when the soil dried. Preferential flow resulted by water repellency was thought to be the reason for the incomplete saturation. Inverse estimation should be a promising method to obtain effective hydraulic parameters of soils under physical nonequilibrium condition.