Abstract：The phytoplankton community in the mainstem from the source region to the estuary of the Yellow River was investigated in the spring and autumn of 2019 to understand the effects of water conservancy projects on ecological integrity and diversity. A total of 350 phytoplankton species, which belong to 8 phyla and 130 genera, were identified. The number of species in spring (229 species) and autumn (307 species) accounted for 65.43% and 87.71% of the total species, respectively. Bacillariophyta and Chlorophyta were dominated. The average phytoplankton density was 162.39×104 cells/L for spring and was 141.12×104 cells/L for autumn. The average biomass was 2.53mg/L and 3.04mg/L in spring and autumn, respectively. Biological evaluation of water quality indicated that water quality in autumn was better than that in spring. The phytoplankton density and biomass of the section influenced by dams were greater than the adjacent natural section. The phytoplankton density and biomass decreased from upstream to downstream in the reservoirs regulated every year or for several years. The opposite phenomenon was investigated in the reservoirs not fully regulated. The values from upstream to downstream were not different significantly in the reservoirs regulated daily. The biological evaluation of water quality indicated that the pollution level from the source region to the estuary increased gradually.
丁一桐, 潘保柱, 赵耿楠, 韩谞, 刘智琦. 黄河干流全河段浮游植物群落特征与水质生物评价[J]. 中国环境科学, 2021, 41(2): 891-901.
DING Yi-tong, PAN Bao-zhu, ZHAO Geng-nan, HAN Xu, LIU Zhi-qi. Phytoplankton in the mainstem of the Yellow River: Community characteristics and bioassessment of water quality. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 891-901.
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