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在考虑地表流边界条件情况下，森林对降雨径流和泥沙的影响是一个非常复杂的过程．本文给出了水源保护林在自然坡面尺度上对径流泥沙影响的初步试验研究结果，森林在自然坡面尺度上对１９９７年７月３１日至８月１日降雨过程的洪峰流量消减率达４５５９％，洪水总量的消减率为６．８％，森林坡面径流总量为９８０．７８ｍ３，荒草坡为１０５２２３ｍ３．森林对１９９６年７月３０日降雨过程的洪峰流量消减率为１７．９５％，森林坡面的径流总量为１５．０８ｍ３，荒草坡为１８．３８ｍ３．从１９９６年森林对降雨径流较低的消减率看，降雨量与降雨强度对径流泥沙有很大的影响．
The impact of forests on rainfall runoff and sedimentation is a very complex process considering surface flow boundary conditions. This paper presents the results of preliminary experimental studies on the impact of water conservation forests on runoff and sediment at the natural slope scale. The reduction of peak flow rate during the rainfall from July 31 to August 1, 1997 on a natural slope scale Reaching 4559%, and the abatement rate of total flood was 6.8%. The total runoff on forest slope was 980.78m3 and that of waste grass slope was 105223m3. The reduction of the peak flow of the forest on the rainfall process on July 30, 1996 was 17.95%. The total runoff on the forest slope was 15.08m3 and that of the hilly slope was 18.38m3. From the rate of decrease of rainfall runoff in forests in 1996, rainfall and rainfall intensity have a great impact on runoff and sediment.