Study on water ecosystem evaluation in Dawen River Basin

In this paper, we investigated the water quality , fish, and riparian zone in Dawen River Basin in October 2016 using comprehensive contamination index method, index of biotic integrity for fish, and analytic hierarchy process in order to assess the river ecosystem health in the basin. The results indicated that the health status of the water ecosystem in Dawen River Basin was generally poor. The poor and very poor sites respectively accounted for 50% and 41.7% of the total sampling points, and the sampling points with medium health level only accounted for 8.3% . The water quality was the worst in the south tributary of Dawen River, the southern section of Yingwen River, and the tributaries of Hui River, belonging to the Class Vbad water. In the evaluation of fish integrity, the results showed that 1site was healthy, 10 sites were sub-healthy , and 13 sites were medium, which respectively accounted for 4.2% , 42.6% , and 53.2% of the total sampling points. The riparian zone evaluation showed generally good results.

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