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Ecological sensitivity refers to the reflection degree of the ecosystem to human activities and natural environment忆 s changes; it explains the accessibility and possibility of the effect of regional ecological environment. Watershed ecological sensitivity is the degree of difficulty and possibility of ecological imbalance and environmental problems when the ecosystem encountered interference. Biodiversity is the most important ecological factor that can be affected by the Watershed ecological sensitivity. By considering the main biodiversity sensitive factors such as ecosystem types, species richness, rarity, endangered and protected level, this paper identified the ecological effects possibility of watershed dam and reservoir projects. By means of GIS technology忆s powerful and spatial data acquisition, processing and modeling analysis capabilities,

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