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从流域森林的年龄结构、面积比例和空间格局探讨了流域层次水源林结构与功能的关系,建立了流域层次结构与功能耦合模型,利用该模型对北京山区水源林进行评价。结果表明:北京山区水源林以中幼龄为主,水源林面积比例为30%,森林斑块空间配置均匀,随着年龄的增加,水源林功能将逐渐增强。
Based on the age structure, area proportion and spatial pattern of watershed forest, the relationship between the structure and function of water resources forest in the basin was discussed, and a coupled model of river basin structure and function was established. The water resources forest in Beijing mountainous area was evaluated by the model. The results showed that the water source forests in Beijing mountainous areas were mainly young and middle aged, and the area of water source forests was 30%. The spatial distribution of forest patches was even. As the age increased, the function of water source forests would gradually increase.