Study on Characteristics of Purple Soils Aggregates Erosion-resistant

Aggregates stability,erosionresistant character and inherence mechanism of purple soil were studied through three aspect which are water stability, mechanics stability and chemical stability. Results showed that the contents of >3mm, >1mm, >0.25mm waterstable aggregates all changed in the following order:wildgrassland>woodland>garden plot>farmland, the ratio of structure damage in the following order: farmland>garden plot>woodland>wildgrassland. Mechanics stability parameter "original stability" in the following order: wildgrassland>woodland>garden plot>farmland, "collapse velocity" in the following order: farmland>garden plot>woodland>wildgrassland, aggregates mechanics stability under different land use in the following order: wildgrassland>woodland>garden plot>farmland. Erosionresistant of soil aggregate develop from Suining group is the best among Penglai stratum, Suining and Shaxi temple. Soil aggregate erosion under different utilization pattern changed in the following order: wildgrassland>woodland>garden plot>farmland.The soil organic and clay influence remarkably the soil aggregate "original stability" and "collapse velocity", they are the mostly intrinsic factor to soil aggregate erosion. 