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通过对秭归县紫色土坡地和王家桥小流域（１６．７ｋｍ２）河道降雨的观测、土壤和泥沙的分析，初步探讨了紫色土坡地土壤颗粒的流失特点、影响因素及其与流域河道泥沙组成的不同。结果表明紫色土坡地流失的泥沙中＜０．０２ｍｍ的颗粒大量富集，而河道泥沙的组成以０．２～０．０２ｍｍ的颗粒为主，其粒径分布更接近于坡地表土
Through the analysis of the rainfall, purple soil slope and the Wangjiaqiao small watershed (16.7km2) in Zigui County, the characteristics of soil particles and its influencing factors and the relationships between them and the river sediment Different composition. The results showed that <0.02mm particles in the sediment of the purple soil slope were enriched in a large amount, while the sediment of the river channel mainly consisted of 0.2 ~ 0.02mm particles with the particle size distribution closer to the surface soil