为了测定受侵蚀的(不松散)沉积物的粒径分布,我们对十种土壤的垄帮进行了降雨模拟试验.来自不同土壤的侵蚀沉积物有明显差别.把松散沉积物和原表土的粒径分布与不松散沉积物粒径分布作了比较,对各种土壤来说,不松散沉积物比松故土壤或沉积物都粗.对于每一种土壤,如果主要变化降雨强度、连续侵蚀及植被的有无,那么沉积物粒径分布的变化甚微.来自垅帮的沉积物粒径分布看来只是在已知条件下一种特定土壤具有的特性. In order to determine the particle size distribution of the eroded (non-loose) sediments, we simulated rainstorms on the ridge of ten soils, and the eroded sediments from different soils differed markedly. For each soil, the non-loose sediments are thicker than the soils or sediments, and for each soil, if the main changes are rainfall intensity, continuous erosion and The presence or absence of vegetation then shows little change in sediment particle size distribution, and the sediment particle size distribution from Langtang appears to be only a characteristic of a particular soil under known conditions.