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采用人工模拟降雨方法，对三峡库区紫色土坡地的养分流失特点及影响因素进行了试验研究。初步认为，降雨导致坡地养分含量降低，这绝大部分是由泥沙流失引起的。泥沙中＜００２ｍｍ的微团聚体和＜０００２ｍｍ的粘粒是养分流失的主要载体。紫色土坡地的养分流失受土壤性质、降雨强度、坡度、植被覆盖等因素影响。
The characteristics of nutrient loss on purple soil slopes in the Three Gorges Reservoir Area and its influencing factors were experimentally studied by artificial simulated rainfall method. It is preliminarily thought that the rainfall leads to the reduction of nutrient content in the slope, which is mostly caused by sediment loss. <0 02mm microaggregates and <0 002mm clays in sediment are the main carriers of nutrient loss. The nutrient loss on purple soil slopes is affected by soil properties, rainfall intensity, slope, vegetation cover and other factors.