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根据合肥近郊旱地连续 3年的实地观测和采样分析数据 ,对不同降雨强度下径流携带泥沙量和各种养分含量进行统计、分析和对比 ,揭示了各种养分流失与降雨强度的关系和流失行为 ,初步查明了旱地耕作层表土和养分的流失在不同降雨强度下的不同表现。表土和有机质的流失与雨强基本呈正相关 ,以径流冲刷作用为主 ;氮磷钾养分的流失则以径流溶蚀为主 ,但情况比较复杂 ,特别是通过“径流溶蚀”流失的养分与雨强并不是简单的正比关系。旱地土肥流失的强度不仅受雨强影响 ,而且还与流失途径有关
According to the field observations and sampling and analysis data of 3 successive years of dry land in suburbs of Hefei, statistics, analysis and comparison of sediment carrying amount and various nutrient contents under different rainfall intensities revealed the relationship and loss of various nutrient loss and rainfall intensity Behavior, tentatively identified different characteristics of topsoil and nutrient loss in dryland plow layers under different rainfall intensities. Surface soil and organic matter loss and rainfall intensity are basically positive correlation with runoff scouring effect; N, P and K nutrient runoff is mainly runoff erosion, but the situation is more complicated, especially through the “runoff erosion” loss of nutrients and rainfall intensity It is not a simple proportional relationship. The strength of dryland soil loss is not only affected by rainfall intensity, but also with the way of loss