Based on the survey of the third level aquatic eco-functional zones of Liao River basin in Liaoning Province and the investigation of its ecosystem, with two typical rivers (Qing River and Fan River) as the selected cases and the water ecosystem health assessment indicators for the principal component analysis (PCA) and the correlation analysis, this paper has constructed the comprehensive assessment indicator groups made of ten parameters: EC, TP, TN, CODCr, BOD5, DAA, DO, DAA, B-IBI, F-IBI, hydrologic index and habitat index, which reveal the integrated physical, chemical and biological characteristics of the rivers in the studied areas. It is shown that among the 11 third level aquatic eco-functional zonings at Qing River and Fan River basins, one zone (Ⅳ-5-4) is evaluated as in the healthy level, six zones (Ⅳ-5-1、Ⅳ-5-2、Ⅳ-5-3、Ⅳ-5-9、Ⅳ-5-10、Ⅳ-5-11) are in sub-healthy level,three zones (Ⅳ-5-12、Ⅳ-5-13、Ⅳ-5-14) are in the ordinary level and one zone (Ⅳ-5-8) is in a poor level. The overall healthy characteristics of the spatial distribution in Qing River and Fan River zonings are gradually deteriorated from the source of the rivers to the end of Liao River, with a close relationship with the human activities.
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