上海淀山湖的浮游植物

淀山湖是上海市最大的淡水湖泊和主要水源地．自2003年8月至2004年5月对淀山湖进行了4次浮游植物的调查采样，共发现浮游植物8门68属160种（包括变种）．其中绿藻门种类最多，有36属99种，占全部种类的61．88％；其次为硅藻门，有18属31种；裸藻门有3属15种；蓝藻门有4属7种；隐藻门有2属3种；甲藻门有2属2种；金藻门有2属2种；黄藻门有1属1种．并对该水体中浮游植物的季节变化、优势种、群落结构特征进行了初步讨论．

Phytoplankton from the Dianshan Lake in Shanghai

Dianshan Lake is the biggest fresh water and the main source of water in Shanghai. We investigated the phytoplankton four times in Dianshan Lake from Aug. 2003 to May 2004. According to the surveys, 160 taxa of phytoplankton belonging to 68 genera of 8 phyla have been identified, of which the most abundant are of Chlorophyta, with 99 species of 36 genera, taking up 61.88% of the total. Followed successively by Bacillariophyta ,with 31 species of 18 genera, taking up 19.38% ; Euglenaphyta, with 15 species of 3 genera; Cyanophyta, with 7 species of 4 genera; Cryptophyta, with 3 species of 2 genera; Pyrrophyta and Chrysophyta, with 2 species 2 genera; Xanthophyta, with 1 species 1 genera. The seasonal change and the structure of the community and dominant species of phytoplankton are also primarily discussed.