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密云水库集水区水源保护林建设是一项具有战略意义的重点工程,对保护集水区的蓄水能力、改善水质、防治水土流失以及对北京未来饮用水供给都有十分重要的意义。针对水库现有水源保护林主要树种组成和林分类型现状,对截留降雨、枯枝落叶容纳降雨、林地土壤蓄水、减少地表径流和净化水质等方面进行分析、比较和评价。最后建议库区水源保护林营造应加大利于节水和净水的树种比例,提出多树种、多林种的都市水源保护林发展思路。
The construction of water conservation forest in the catchment area of Miyun Reservoir is a key strategic project with great significance for protecting the water storage capacity, improving water quality, preventing soil erosion and water supply to Beijing in the future. According to the current status quo of main tree species composition and stand type of water conservation forest in reservoirs, this paper analyzes, compares and evaluates the interception rainfall, litter holding rainfall, soil water storage in forest land, reducing surface runoff and water purification. Finally, it is suggested that the reserve of water conservation forests in the reservoir area should be designed to increase the proportion of tree species that benefit water conservation and water purification and put forward the development ideas of multi-tree species and multi-forest urban water source protection forests.