Response mechanism and ecological effects of plankton on the water environment of the Weihe River
[Objective]In order to investigate the response mechanism and ecological effect of plankton on the water environment in the Shaanxi section of the Weihe River,[Methods]the Shaanxi section of the Weihe River was took as the study area and set up a total of 14 sampling points in April 2021,with a total of 14 water samples,to analyze the spatial distribution characteristics of the plankton community structure;the Pielou index,Margalef index,and Shannon-Weiner index are commonly used to evalu-ate the uniformity,species richness,and diversity of the plankton community and to evaluate the environmental quality of the cross-section;and use canonical correspondence analysis(CCA)and redundancy analysis(RDA)to determine the extent to which environmental factors impact the geographic distribution of phytoplankton and zooplankton groups.[Results]The result showed that there were 7 phyla and 55 species of phytoplankton in the Shaanxi section of the Weihe River,with the largest num-ber of Bacillariophyta(49.09％)and 6 dominant species.There were 22 species of zooplankton in 3 phyla,with Rotifera ac-counting for the highest proportion(68.18％)and 4 dominant species.The Shannon-Weiner index(H'),Pielou index(J),and Margalef index(d)of phytoplankton ranged from 1.017 to 4.025,0.267 to 0.890,and 0.446 to 1.099,respectively.The indices of zooplankton ranged from 0.811 to 2.459,0.754 to 1.000,and 0.126 to 0.542,respectively.The primary environ-mental parameters influencing the spatial distribution of phytoplankton communities were found to be TP,NH3-N,and pH,according to the CCA analysis.The result based on RDA show that chemical oxygen demand(COD)and water temperature(WT)are the key environmental factors that have major effects on the community structure of zooplankton.[Conclusion]The conclusion showed that the change in plankton index in the Shaanxi section of the Weihe River showed that the study area was in a state of clean to medium pollution.According to the indicator species of phytoplankton and zooplankton in water pollution in Freshwater Algae in China:System,Classification,and Ecology and Environment and Indicator Organisms(Waters Sub-volume),the water environment quality was evaluated by comparing the diversity index of phytoplankton and zooplankton in this study,and the response of zooplankton to water quality assessment was more accurate.By constructing a comparison judgment model between the water environment and plankton and selecting more accurate evaluation indicators in the region,it is helpful to improve the accuracy of plankton's indicator effect on the water ecological environment and then reveal the response mechanism of plankton to the water ecological environment.The above result can provide a theoretical reference for water ecological environment protection in the Weihe River basin.
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