Change of Purple Soil Nutrient Loss Based on Rainfall Simulator

With simulated rainfall equipment,the pattern of soil nutrients from purple soil of Three Gorges Reservoir areas under rainfall intensity which was 104.24 mm/h and 5° runoff plots was studied.The results were as follows: The topsoil nutrients showed a decreasing trend after rainfall.Nutrient loss was: Middle button top of the slope.Almost all nutrients were manifestations of nutrient enrichment in soil profile,and the deeper soil profile was,the higher nutrient enrichment was.Change characteristics of eroded sediment,the total nutrient content order of magnitude was as follows: Organic matter TK TP TN;available nutrients order of magnitude was: AK AN AP.Erosion sediment nutrient duration regression equation could be summarized as linear,quadratic,and power function.Different nutrient function had different forms.But the runoff TN and TP duration regression equation could be expressed by power function.