大力加湖鲟鱼放养场浮游植物及鱼产潜力

Phytoplankton composition in Dalijia Lake

2004年5、7、9、12月对大力加湖浮游植物的种类组成结构特征进行了研究。结果表明：大力加湖鲟鱼放养场浮游植物96个种属，密度255．54×10^4 ind．／L，生物量14．166mg／L。浮游植物季节变化比较明显，密度秋季最高为456．160×10^4 ind．／L，生物量以秋季最高30．105mg／L。多样性指数变化是夏季〉秋季〉冬季〉春季；均匀度指数变化是冬季〉夏季〉秋季〉春季。全库总鱼产潜力527760kg，总放养量2804800尾。

The species composition of phytoplankton was investigated in Dalijia Lake in May, July, September and December 2004. Results indicate ： There were 123 species of phytoplankton. The abundance of phytoplankton was 255.54 × 10^4 ind./L, The biomass of phytoplankton can reach 14. 166mg/L. As the seasons changed, the phytoplankton changed obviously. The abundance apex of phytoplankton of 456. 160 × 10^4 ind./L appeared in summer; and the biomass apex of phytoplankton of 30. 105 mg/L appeared in autumn. The variation of diversity index was Summer 〉 Autumn 〉 Winter 〉 Spring; and that of evenness index was Winter 〉 Summer 〉 Autumn 〉 Spring. The total potential productivity of this reservoir is 527760 kg, and 2804800 sturgeons were stored in it.