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In order to understand the current status of the phytoplankton in the Yalong River after years of operation of the terraced hydropower stations, surveys of phytoplankton and environmental factors were carried out at 29 sections of the Yalong River Basin in May (spring) and November (autumn) in 2023, to analyse the characteristics of the changes in the structure of the phytoplankton community and the corresponding relationship with the environmental factors. A total of 132 species of phytoplankton were collected, belonging to 6 phylums, 7 classes, 17 orders, 28 families and 42 genera, mainly composed of diatoms with relative abundance of 81%, and the dominant species group included 8 species of phytoplankton such as Diatoma. Tenue, Achnanthes. sp, etc., of which the number of species in the spring was obviously higher than that in the autumn; 34 species of zooplankton were identified, belonging to 3 phylums, 4 classes, 10 orders, 20 families and 28 genera, mainly composed of Diatoma. Tenue, Achnanthes. sp and other species. 28 genera, mainly composed of Protozoa phylum with a relative abundance of 62%, and the dominant species group included 4 species of zooplankton such as Difflugia avellana, Difflugia globulosa, etc.; there were seasonal and spatial differences in the dominant species of phytoplankton and their biomass and diversity indices. Phytoplankton biomass was much higher in spring than in autumn, while zooplankton was much higher in autumn than in spring; the overall upstream phytoplankton biomass was higher than that in the middle and lower reaches. From the results of the diversity index evaluation, it was concluded that the water quality of Yalong River in spring was better than that in autumn, and the water quality of the upper reaches was better than that of the middle and lower reaches; the results of the redundancy analysis (RDA) showed that the dominant species of phytoplankton were mainly closely related to NH3-N, NO3−-N, WT, and Chla; and that the dominant species of zooplankton were mainly closely related to TN and DTN.

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Characteristics of Spatial and Temporal Changes in Phytoplankton Community Structure and Environmental Drivers in the Yalong River Basin

  • 会议论文

  • 发表日期：

    2025年

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  • Long Shi,
  • Dili Li,
  • Long Yan,
  • Nan Wang

摘要

In order to understand the current status of the phytoplankton in the Yalong River after years of operation of the terraced hydropower stations, surveys of phytoplankton and environmental factors were carried out at 29 sections of the Yalong River Basin in May (spring) and November (autumn) in 2023, to analyse the characteristics of the changes in the structure of the phytoplankton community and the corresponding relationship with the environmental factors. A total of 132 species of phytoplankton were collected, belonging to 6 phylums, 7 classes, 17 orders, 28 families and 42 genera, mainly composed of diatoms with relative abundance of 81%, and the dominant species group included 8 species of phytoplankton such as Diatoma. Tenue, Achnanthes. sp, etc., of which the number of species in the spring was obviously higher than that in the autumn; 34 species of zooplankton were identified, belonging to 3 phylums, 4 classes, 10 orders, 20 families and 28 genera, mainly composed of Diatoma. Tenue, Achnanthes. sp and other species. 28 genera, mainly composed of Protozoa phylum with a relative abundance of 62%, and the dominant species group included 4 species of zooplankton such as Difflugia avellana, Difflugia globulosa, etc.; there were seasonal and spatial differences in the dominant species of phytoplankton and their biomass and diversity indices. Phytoplankton biomass was much higher in spring than in autumn, while zooplankton was much higher in autumn than in spring; the overall upstream phytoplankton biomass was higher than that in the middle and lower reaches. From the results of the diversity index evaluation, it was concluded that the water quality of Yalong River in spring was better than that in autumn, and the water quality of the upper reaches was better than that of the middle and lower reaches; the results of the redundancy analysis (RDA) showed that the dominant species of phytoplankton were mainly closely related to NH3-N, NO3−-N, WT, and Chla; and that the dominant species of zooplankton were mainly closely related to TN and DTN.