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该文对大面积水源保护林的水源涵养与防止土壤侵蚀效益进行了研究，并找到了一种切实可行的定量评价方法，利用该方法对密云水库上游密云县境内１３．１１万ｈｍ２水源保护林的水源涵养与防止土壤侵蚀效益进行了定量评价．结果表明：水源保护林具有较强的水源涵养能力和防止土壤侵蚀能力．与无林荒地相比，在５０年一遇场暴雨情况下，有林地可使地表径流量减少３８．８％，土壤侵蚀量减少５３．８％，年土壤侵蚀量减少８３．３％．
This paper studied the water conservation and soil erosion prevention of large-scale water conservation forests and found a feasible quantitative evaluation method. Based on this method, a total of 131,100 hm2 water conservation forests in Miyun County, Water conservation and soil erosion prevention benefits were quantitatively evaluated. The results showed that water conservation forest has strong ability of water conservation and soil erosion prevention. Compared with non-forested land, in the case of heavy rainfall in 50 years, forest land can reduce surface runoff by 38.8%, soil erosion by 53.8% and annual soil erosion by 83.3%.