青山湖夏季浮游植物群落结构及水质评价

2013年7月份对黄石青山湖的浮游植物群落结构和水质状况进行了调查.共鉴定浮游植物90种,隶属7个门51个属,其中以绿藻门种类最多,有21属36种,占浮游植物种类总数的40％;蓝藻门种类数次之,有12属23种,占浮游植物种类总数的25.56％;硅藻门有8属14种,占浮游植物种类总数的15.56％;裸藻门5属9种,隐藻门有2属5种,黄藻门2属2种,甲藻门1属1种;浮游植物平均密度约为67.450×106个/L,以隐藻门数量最多,平均密度约为28.396×106个/L,占水体中浮游植物整体平均密度的42.10％,说明青山湖夏季浮游植物以隐藻为优势类群.基于浮游植物密度、优势种、污染指示种、Margalef多样性指数和国家地表水环境质量标准（GB 3832-2002）综合评价,青山湖水体污染严重,呈富营养状态.

Community Structure of Phytoplankton and Water Quality Assessment in Summer in Lake Qingshan

The community structure of phytoplankton and water quality in Lake Qingshan in Huangshi City were investigated in July, 2013. 90 species of phytoplankton belonging to 51 genera 7 phyla were identified, of which the most abundant was Chlorophyta, with 36 species of 21 genera, accounting for 40% of the total species ; followed successively by Cyanophyta, with 23 species of 12 genera, taking up 25.56% of the whole species; Bacillariophyta, with 14 species of 8 genera, taking up 15.56% of the whole species; Euglenophyta with 9 species of 5 genera; Cryptophyta, with 5 species of 2 genera; Xanthophyta with 2 species of 2 genera and Pyrrophyta with 1 species of 1 genera. The average density of the phytoplankton was about 67. 450 x 106 cell/L, among which was the richest phyla, Cryptophyt, with a density of approximately 28. 396 x 106 cells/L, accounting for 42.10% of the total density of the phytoplankton, which demonstrating that this phyla was the dominant group of the phytoplankton in summer in Lake Qingshan. Based on a comprehensive assessment concerning phytoplankton density, dominant species, pollution indicating species, Margalef diversity index and the Environmental quality standards for surface water （GB 3832 -2002）, Lake Qingshan was highly contaminated, belonging to high eutrophic state