Spatial Variability of Soil Hydraulic Properties in a Forested Hillslope

摘要: Spatial variability of soil hydraulic properties was measured in a forested hillslope and analyzed by applying combined water-retention-hydraulic-conductivity models (the LN VG models) power function model for conductivity Leibenzon model). Results showed that the pore-tortuosity parameterl should be treated as fitted parameter accurate descriptions unsaturated conductivity. The simultaneous optimization both retention curves is preferable to obtain appropriate when data are available estimation. produced slightly poorer estimates than models. exponent exhibited spatial variation with standard deviation 2.38. based on parameters obtained procedure. ψ m , which has positive correlation median pore-radius, generally small at crest upper slope locations large mid-slope footslope locations. Except crest, surface soils had larger values subsurface soils, suggesting well-developed crumb structure horizons forest soils. For most σ greater I, indicating relatively width pore-size distribution. Saturated (K s) locations, largerK s were attributable largerψ m values.