Characteristics of interflow in purple soil of hillslope

The interflow constitutes an important portion of total runoff in purple soil of a hillslope.A series of artificial field simulation experiments were conducted to explore the characteristic of interflow in the purple soil of hillslpoe in the different rainfall intensities and land surface conditions.Experimental results show that the observed runoff coefficient and the average interflow for the interflow on undisturbed wastelands are 3 to 15 times and 7 to 33 times that of the observed on bare cultivated lands,respectively.Such characteristic differences in interflow generations on the two lands will become more evident with the increase of rainfall intensities.The observed runoff coefficient for the interflow on bare cultivated lands decreases significantly with the increase of rainfall intensities,while such a characteristic of interflow is not found on undisturbed wastelands.Interflow generations on undisturbed wastelands vary with land surface conditions such as soil compactions and vegetation densities.Surface soil compaction due to heavy rainfall and the decrease in vegetation cover will contribute to a significant reduction of interflow generations on undisturbed wastelands.