摘要
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 characteristic and influence factors of nutrient losses on the purple soil sloping field in the three gorges reservoir region were studied by means of simulated rainfall, physical and chemical analysis. The results showed that rainfall led to the decrease of nutrient content on top soil, this was mostly caused by the sediment losses. The clay (<0 002mm) and microaggregates (0 02～0 002,<0 002mm) were the main carriers of nutrient losses. The nutrient losses were effected by soil property, rainfall intensity, slope degree, vegetation cover rate.
基金
国家自然科学基金
