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OALib Journal期刊
ISSN: 2333-9721
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岷江上游典型生态系统水源涵养量及价值评估
DOI: 10.3724/SP.J.1145.2009.00453, PP. 453-458
Keywords: 水源涵养,岷江上游,生态价值,生态经济学
Abstract:
岷江上游自然生态系统由于具有重要的水源涵养功能，被誉为长江流域“水塔”的重要组成部分.通过野外实地调查和已有文献资料收集分析，初步核算了岷江上游典型生态系统的水源涵养量；并利用生态经济学价值量评估方法，分别估算了该区典型生态系统的水源涵养价值.岷江上游森林、灌丛和草地3种典型生态系统的水源涵养量分别为21.23×108m3、17.92×108m3和14.00×108m3，价值6.34×108元、5.36×108元和4.19×108元.植被冠层和土壤层是水源涵养的主要作用层，而枯枝落叶层水源涵养量和价值均较小.3种典型生态系统中以森林生态系统水源涵养价值最大，占总价值的39.92%，灌丛和草地生态系统分别占33.73%和26.35%.森林生态系统中以冷杉林的水源涵养量和价值为最高，占整个森林系统涵养水源价值的51.22%，整个研究区价值的20.48％，在涵养水源过程中占据主导地位.图2表4参31
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