Investigation of Applicability of Soil Map Units to Estimate the Spatial Variability of Soil ‎Erodibility

Soil erodibility is one of the six components affecting water erosion of the universal soil loss equation (USLE). K-factor ýis best obtained from direct measurements on natural plots. This is an infeasible task on large scales. To overcome this ýproblem measured K-factor values have been related to soil properties and the soil classification maps are used. The ýcurrent research examines the ability of the soil maps for calculation of erodibility factor in the watershed scale. This ýsubject was followed by investigation of difference of erodibility components among the soil types of Darabkola ýWatershed. Also, geostatistical technique with Kriging method are used for representation of the spatial distribution of ýK-factor. Results showed that among the K-factor components, percent of silt, structure class and permeability had ýsignificant difference between some of soil types, and other components and K-factor didn’t have significant ýdifference. In conclusion any coincidence seemed between erodibility map and soil types map.