Abstract: The phytoplankton community structure of Linhuan Lake in Huaibei City was conducted from August 2015 to June 2016, phytoplankton community structure and its relationships with environmental factors were analyzed. A total of 135 phytoplankton species belonging to 7 phyla, 65 genera were recorded. The phytoplankton community structure dominated by Cyanophyta, Chlorolhyta respectively, in which Cyanophyta and Chlorolhyta accounted for 64.93% of the total community composition. According to the abundance and occurrence, Cryptomonas erosa, Oscillatoria chlorine and Phormidium tenue were considered as the dominant species. The mean abundance and biomass of phytoplankton were 107.32×105 cells/L and 8.11 mg/L respectively, with the spatial pattern of decreasing from east to west. The Shannon-Wiener index(H′), Margalef index(D)， and Pielou index(J) of the phytoplankton community were 2.81, 2.96, and 0.617, respectively. The results of Pearson correlation analyses and the RDA indicated that water temperature, transparency, nutritive salt and chla were the four main environmental drivers affecting the phytoplankton community structure in Linhuan Lake. Combined with the existing research results, the succession characteristics of phytoplankton communities in lakes with different subsidence time series were discussed.

Key words: Linhuan coal mining subsidence area, phytoplankton, community structure, environmental factors