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Phytoplankton and environmental factors were investigated at 8 sampling sites in the Lake Baiyangdian in May and Au⁃ gust of 2018, to study their relationship which can provide theoretical basis for water resources management and aquatic ecological protection. The results of Pearson correlation analysis showed that the main environmental factors were dissolved oxygen (DO), permanganate index (CODMn), total nitrogen (TN) and total phosphorus (TP) in flood season while those were DO, CODMn, ammonia nitrogen (NH3 ⁃N) and TP in non⁃flood season. Phytoplankton species were detected in 5 phyla, 38 species in flood sea⁃ son and 6 phyla, 43 species in non⁃flood season, respectively. The density of phytoplankton was 415.30×105-1018.14×105 cells / L and 249.62×105-454.21×105 cells / L, respectively. The dominant species were 6 species and 10 species and were mainly cya⁃ nobacteria and green algae. The Shannon⁃Wiener diversity index (H′), Margalef species richness index (dM), Pielou evenness index (J) and species diversity threshold of phytoplankton community all indicated that the diversity of phytoplankton in flood sea⁃ son was lower than that in non⁃flood season. H′ and J were higher in areas with better water quality (such as the center of the Lake

Spatiotemporal variation of phytoplankton community and its relationship with environmental factors in the Lake Baiyangdian