The zoobenthos species in 21 sites of the 11 sections in Songhua River mainstream were sampled in 2012-2015. They were evaluated with 7 single indices,and then a simple superposition method was used to make a comprehensive evaluation,which was compared with the conventional physicochemical monitoring and evaluation. The results showed that compared with 2012,zoobenthos species in Songhua River mainstream were rich,and the evaluation results were improved in 2013. In 2015,the Baiduzhen-Tongjiang section was ...
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