Abstract：To reveal the characteristics of phytoplankton community structure and their response to nutrient, phytoplankton and physicochemical indexes of water quality in Lake Hulun, Daihai, Ulansuhai and Juyanhai were sampled and investigated in July 2019 and July 2020. 101, 44, 125 and 42 phytoplankton species were identified in Lake Hulun, Daihai, Ulansuhai and Juyanhai with a total phytoplankton abundance of 5.71×105, 0.18×105, 3.45×105 and 6.96×105 cells/L, respectively. Chlorophyta, Diatoms and Cyanobacteria were the dominant phyla. However, only 6dominant species were identified in Juyanhai, which was the least compared with more than 10 dominant species in the three other lakes. The dominant species of phytoplankton were mainly impacted by TLI, T, TDS, NH4+-N, SAL and pH (P<0.01). The mean values of phytoplankton Shannon-Wiener diversity (Hx), richness (D) and evenness (J) were 1.4, 0.38 and 2.79 in Hulun Lake, 2.28, 0.87 and 1.42 in Daihai, 2.99, 0.74 and 4.46 in Ulansuhai, 2.39, 0.75 and 0.75 in Juyanhai, which indicated the corresponding evaluation results were medium rich/medium/medium nutrition, medium/medium rich/poor nutrition, medium/poor medium/poor nutrition, medium /moderate/poor nutrition, respectively. However the evaluation results of the comprehensive nutrition index (TLI) were severe eutrophication, moderate eutrophication, mild eutrophication and moderate eutrophication, respectively. Obviously, the evaluation results of the three approaches were different. On the whole, the evaluation result of phytoplankton index was significantly lower than that of physical and chemical indicators. This might be because the three diversity indexes were not only affected by the comprehensive nutrition indexes like TP, TN, SD and Chl.a, but also significantly correlated with T, pH, SAL and TDS. The analyzed results showed that J was significantly correlated with all the indexes, while Hx was significantly correlated with the indexes that were related to the comprehensive nutritional indexes and D was significantly correlated with T, pH, SAL and TDS. Therefore, the use of biological evaluation such as biodiversity alone may not be applicable to the lakes in the Inner Mongolia Plateau and it is suggested to use multiple evaluation methods in combination with physical and chemical indicators for a comprehensive evaluation.
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WANG Shi-huan, ZHANG Sheng, WU Rong, SHI Xiao-hong, ZHAO Sheng-nan, SUN Biao. Characteristics of phytoplankton in cold and arid areas and their indicator of trophic status. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 311-320.
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