基于北京市第六次森林资源二类调查数据,区划北京山区森林景观类型,并应用InVEST模型评估北京山区森林生态系统的水源涵养功能。结果表明: 总面积为479 209 hm2的北京山区森林可划分为18种类型,其水源涵养总量为16.2万亿m3,平均水源涵养深度为75 mm; 各森林类型的水源涵养深度差异很大,落叶松人工林最大,为148 mm,其他阔叶人工林最小,为47.6 mm; 在各类森林水源涵养总量方面,天然柞树林最高,为8.25万亿m3,其他阔叶人工林最小,为60.7亿m3。
To comprehensively evaluate the water conservation function of different forest ecosystems in mountain areas of Beijing, the landscape of forests was classified based on the data of CategoryⅡof the sixth forest inventory in Beijing. Function of the forest ecosystems in water conservation was estimated by means of InVEST model. The total area of 479 209 hm2 of Beijing mountain forests was divided into 18 forest types, and the total water conservation capacity was 1.62×1013 m3, equaling to average water conversation capacity of 75 mm. There was great difference in average water conversation capacity among various forest types. Larch plantation had the biggest capacity of 148 mm, while the other broadleaved tree species plantations had only 47.61 mm. Among all types of forests, the natural oak forest had the biggest total water holding capacity of 8.25×1012 m3, while the other broadleaved tree species plantations had only 6.07×109 m3.
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