Investigation of Plankton Community and Water Quality Assessment in Longjian Creek
The country attaches great importance to the protection of the Yangtze River water body.The 18th Na-tional Congress of the Communist Party of China proposed"building an important ecological barrier in the upper reaches of the Yangtze River".This study focuses on the important tributary of the upper reaches of the Yangtze River-the end tributary of the lower reaches of the Tuojiang River,the Longjianxi River,as the research object.From July to December 2023,three sections were selected in the upstream,middle and downstream to investigate and detect indicators such as the types,quantities,and community composition of aquatic plankton.And the water quality of Longjian Creek is evaluated based on changes in the composition and quantity of plankton.The results show that:①There are 8 phyla of phytoplankton and 3 phyla of zooplankton in the water body of Longjian Creek.Planktonic plants include the phyla Cyanobacteria,Cryptophyta,Chrysophyta,Pyrophyta,Xanthophyta,Euglenophyta,Bacillus,and Chlorophyta.The dominant species are Bacillariophyta,accounting for 11.98％,fol-lowed by Cryptophyta and Chlorophyta;There are three phyla of planktonic animals,namely Protozoa,Rotifers,and Cladocera,accounting for 34.7％,8.8％,and 1.7％respectively.The dominant species are Protozoa.② The average density of plankton is 1.444 × 107cell/L.③ According to statistical calculations,the average Shannon Weiner diversity index(H')is 1.282;the average Pielou evenness index(J)is 0.500,and the average Margalef rich-ness index(d)is 1.160.After comprehensive evaluation,it can be concluded that the species richness and commu-nity structure of the surveyed river section are relatively low,and the overall performance is moderate pollution,with a general level of water quality.It is recommended to strengthen the investigation and management of sewage outlets along the Longjian River,strengthen the construction of rural sewage pipelines and treatment facilities,continue to increase environmental protection publicity,and enhance the public's awareness of ecological environ-ment protection.
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