中文摘要：

2008年12月至2009年10月按季度对养殖湖泊大通湖浮游植物群落结构及与环境因子关系进行了初步研究,并通过与1960年数据的纵向比较,探讨了集约化养殖对大通湖水域环境的影响,为其渔业可持续发展提供理论依据.调查期间,共发现浮游植物98种,隶属于7门54属.优势种类包括二角多甲藻、尖尾蓝隐藻、小球藻、卵形隐藻、梅尼小环藻、啮蚀隐藻、卷曲鱼腥藻、铜绿微囊藻和固氮鱼腥藻,优势种的季节更替明显.浮游植物细胞密度的年平均值为1.84×106cells.L-1,其中夏季最高,为16.4×106cells.L-1,其他3个季度在1.71×106～1.98×106cells.L-1.浮游植物丰富度指数（D）全年在2.01～4.55,Shannon多样性指数（H）在1.26～2.69,均匀度指数（J）在0.69～1.27.典范对应分析表明,水深、水温、透明度、总磷、氧化还原电位、电导率是影响大通湖浮游植物群落结构的主要因子.

英文摘要：

From December 2008 to October 2009,a seasonal investigation was conducted on the phytoplankton＇s community structure and its relationships with environmental factors in Datong Lake.With the comparison of the historical data in 1960,the potential effects of intensive aquaculture on the aquatic environment were analyzed,aimed to provide theoretical support for the sustainable fishery of freshwater lakes.A total of 98 phytoplankton species belonging to 7 phyla and 54 genera were collected,among which,Peridinium bipes,Chroomonas acuta,Chlorella vulgaris,Crytomonas ovate,Cyclotella meneghiniana,Crytomonas erosa,Anabaena circinalis,Microcystis aeruginosa,and Anabaena azotica were the dominant species,and had obvious seasonal variations.The mean annual cell density of the phytoplankton was 1.84×106 cells·L-1,being the highest in summer（16.4×106 cells·L-1） and ranged from 1.71×106 to 1.98×106 cells·L-1 in the other three seasons.The values of the abundance index,Shannon index,and Pielou index of the phytoplankton community were 2.01-4.55,1.26-2.69,and 0.69-1.27,respectively.Canonical correlation analysis（CCA） showed that water depth,water temperature,transparency,and water total phosphorus content,oxidation-reduction potential,and electrical conductivity were the main environmental factors affecting the phytoplankton community structure in the Lake.