摘要
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。
Through making rainfall observation,analysing compositions of the eroded soil and sediment on the purple sloping field and Wangjiaqiao valley(16.7km 2) in Zigui county,the characteristic and difference of sediment particle compositions between eroded sloping field and river course were initially explored. The results indicated that the sediments of eroded field richly gathered clays and <0.02 mm microaggregates.It had lower contents of >0.02 mm particles than the top soil. The sediments in river course were mainly consisted by 0.2～0.02 mm sands and microaggregates,its particle distributions were close to the top soil of sloping field.
基金
国家自然科学基金
关键词
紫色土
颗粒组成
泥沙
土壤流失
坡地
purple soil
particle composition
sediment
soil loss
