Study on Soil Erodibility of Different Land Utilization Styles in the Songhuaba Water Source Area

In order to reveal the condition of the soil erodibility in Songhuaba Water Source Area in Kumming City. Using the universal soil loss equation to calculate estimated K value of soil erdibility and EPIC model was used to calculate measured K value of soil erdibility of three different land utilization styles of songhuaba water source area. To explore the correlation between the measured K value and the estimated K value and based on the measured data to revised USLE. The measured K value of soils mainly ranged from 02866 to 03427. For measured K value of three different land utilization styles, the order was as follow: wasteland > farmland slope > shrub land. The Pearson correlation of the indicators of EPIC model showed that the correlation of soil erodibility K value with silts contents was obviously positive, but which showed obviously negative with sand contents and clay contents. Correlation of K value with organic carbon content was not significant.