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本文通过在密云水库上游典型的水源涵养林树种──刺槐林及其采伐迹地上设置自然坡面径流场，并配有三角形量水堰和自记水位计，对其坡面自然降雨的产流量和产沙量进行了观测和分析，根据水量平衡原理，研究了其产流机制，并绘制了典型暴雨的产流过程线。可为水库上游水源涵养林的建设及其水源涵养效益的评价提供科学的理论依据。
In this paper, a natural slope runoff field is set up on the typical water conservation forest species (Robinia pseudoacacia Linn.) And its cutting sites in the upper reaches of Miyun Reservoir, and with triangular weir and self-metered water level meter, the runoff of natural rainfall And sediment yield were observed and analyzed. Based on the principle of water balance, the mechanism of its production flow was studied and the process flow of typical heavy rain was drawn. It can provide a scientific theoretical basis for the construction of water conservation forests in the upper reaches of the reservoir and the evaluation of water conservation benefits.