Eight typical sampling sites were chosen to investigate the phytoplankton community structure and to assess the eutrophication degree of Baiyangdian Lake in 2009. Our results showed that among the total 133 species identified, Cyanophyta, Chlorophyta, and Bacillariophyta dominated the phytoplankton community. In spring, Chlorophyta and Bacillariophyta were the dominant phyla, and the dominant species includedChlorellasp.,Chroomonas acutaUterm., andMicrocystis incertaLemm.; the density of the phytoplankton ranged from496×104to6256×104 cells/L with an average of2384×104 cells/L. However, Chlorophyta and Cyanophyta became the dominant phyla in summer, and the dominant species wereChlorellasp.,Leptolyngbya valderianaAnagn., andNephrocytium agardhianumNageli.; the density of the phytoplankton varied from318×104to4630×104 cells/L with an average of1785×104 cells/L. The density of the phytoplankton has increased significantly compared to the previous investigations in 2005. The index of Carlson nutritional status (TSIM) and the dominant genus assessment indicated that the majority of Baiyangdian Lake was in eutrophic state.
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