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DOI:10.13522/j.cnki.ggps.2022091
Niche Analysis of the Dominant Phytoplankton Species in Nanhai Lakes in Northwest China
YAO Zhi, LIU Yijie, HE Guihao, ZHU Rong, YANG Wenhuan,SUN Tao, FENG Dongdong, LI Weiping
1. Inner Mongolia University of Science and Technology, Baotou 014010, China; 2. Northwest Engineering and Research Incorporation Limited of China Metallurgical Group, Baotou 014010, China; 3. Dezhou Municipal Water Resources Bureau, Dezhou 253041, China
Abstract:
【Objective】Humanity and temperature are two factors affecting microbial communities not only in terrestrial systems but also in aquatic ecosystems. Taking Nanhai lake in cold-arid Baotou as an example, this paper analyzes the relationship between phytoplankton community and eutrophication in the lake.【Method】 Water samples were taken from December 2017 to November 2018 from the lake. Phytoplankton community in each sample was counted. The ecological breadth and overlap of the dominant phytoplankton species were described by the niche analysis method, from which we calculated the effect of water environmental factors on phytoplankton community using the grey relational analysis.【Result】The dominant phytoplankton species detected from the water samples were 7 phyla, 38 genera and 95 species during the frozen period, and 7 phyla, 47 genera, 106 species during the unfrozen period. The main phytoplankton community comprises cyanobacteria-green algae-diatom. The niche breadth and niche overlap of the dominant species during the frozen period were smaller than those during the unfrozen period, and the competition of phytoplankton for resources was strong during the unfrozen period. The gray correlation analysis showed that the chemical oxygen demand (COD) and pH of the water were strongly correlated with phytoplankton density. Total phosphorus (TP) had a great impact on change in the phytoplankton population during the frozen period, while water temperature impacts the phytoplankton population change during the unfrozen period more greatly. 【Conclusion】 The dominant phytoplankton species in the Nanhai Lake are affected by a variety of ecological factors and vary with time. Organic pollutants and phosphorus nutrients are the main factors affecting the phytoplankton community.
Key words:  cold-arid area; niche; phytoplankton; grey relation analysis; urban lake