摘要
In order to clarify the regular pattern of community succession of planktonic diatoms and the relationship between the diatoms and the physic-chemical parameters, the species, abundance, and biomass of planktonic diatoms, and environmental factors in Baiguishan Reservoir （BGR） were investigated in Baiguishan Reservoir from February to November in 2016. Trophic state index （ TLI ） was used to evaluate the trophic state, and factors affecting the dynamics of planktonic diatom community were analyzed by Redundancy analyses （RDA）. The results showed that Baiguishan Reservoir belonged to mesotrophic water body, and all observed phytoplankton belonged to 69 genera of 25 families. The sampling points were divided into the same 2 groups in the clustering analysis based on environmental factors and Non-metric Multi-Dimensional Scaling （NMDS） analysis, indicating that the community structure of planktonic diatoms had the same change trends with the changes of environmental factors. RDA showed that the main factors affecting community structure were total phosphorus （TP）, water temperature （WT） and the ratio of ammonia nitrogen to total phosphorus （NH 3-N/TP）. Therefore, TP was the most important factor influencing the dynamics of planktonic diatom community in mesotrophic reservoir.
In order to clarify the regular pattern of community succession of planktonic diatoms and the relationship between the diatoms and the physic-chemical parameters, the species, abundance, and biomass of planktonic diatoms, and environmental factors in Baiguishan Reservoir （BGR） were investigated in Baiguishan Reservoir from February to November in 2016. Trophic state index （ TLI ） was used to evaluate the trophic state, and factors affecting the dynamics of planktonic diatom community were analyzed by Redundancy analyses （RDA）. The results showed that Baiguishan Reservoir belonged to mesotrophic water body, and all observed phytoplankton belonged to 69 genera of 25 families. The sampling points were divided into the same 2 groups in the clustering analysis based on environmental factors and Non-metric Multi-Dimensional Scaling （NMDS） analysis, indicating that the community structure of planktonic diatoms had the same change trends with the changes of environmental factors. RDA showed that the main factors affecting community structure were total phosphorus （TP）, water temperature （WT） and the ratio of ammonia nitrogen to total phosphorus （NH 3-N/TP）. Therefore, TP was the most important factor influencing the dynamics of planktonic diatom community in mesotrophic reservoir.
基金
Supported by the Science and Technology Key Project of Henan Province(162102310389)
the Key Project of The Education Department of Henan Province(14A610012)
