Phytoplankton Diversity of Hongqi Reservoir in Jimunai

Hongqi Reservoir is supplied with snow melt.It locates in Jimunai,Xinjiang.Phytoplankton community structure was investigated and analyzed to explain the ecological characters of Hongqi Reservoir on July 2008,October 2008 and May 2009.A total of 113 phytoplankton species,belonging to 8 phylum were identified.There were 42 species of diatom,38 species of green algae,10 species of euglenids,9 species of blue green algae,4 species of yellow green algae,4 species of chrysophyceae,3 species of fire algae,2 species of cryptomonads.Green algae and diatoms was dominance in the species composition.Merismopedia punctata,Phormidium tenus,Botrydiopsis arhiza,Cyclotella bodanica,Chlorella vulgaris,Schroederia nitzschioides as well as Ankistrodesmus acicularis are the dominant species.Phytoplankton species composition in different periods showed significant differences(P0.01),the wet season(57 species)the normal-water season(42 species)the dry season(31 species).Chlorophyta has the largest cell density,but Pyrrophyta and Cryptophyta were the lowest.And cell density between different categories of phytoplankton was significantly difference(P0.001).The cell density in different periods was also significant difference(P0.01),the cell density of the normal-water season was(5.03±6.40)×105 ind/L,the wet season was(2.40±4.98)×105 ind/L,the dry season was(0.37±0.42)×105 ind/L.Moreover,that the phytoplankton composition,cell density and diversity were closely related to the water temperature of Hongqi Reservoir.