• 关键词：群落结构  多样性指数  优势种

• 基金项目：

• 高玉荣
• 中国科学院动物研究所 北京

• 摘要：对京密运河及北京排污河进行了不同季节的藻类生态调查,根据藻类群落结构特征,对河流质量进行评价,并将河流水质划分为五级.相关性分析结果表明,藻类数量和生物量与水质相关性显著.根据藻类组成、分布特征及河流水质选出了作为评价京密运河和北京排污河污染程度的几种指示藻类.

• Abstract：Algal investigation and water quality evaluation were carried out for Jingmi Canal and Beijing Effluent sewage stream during 1982-1984 and the waters were categorized into five classes. In the upper stream of Jingmi Canal, dominators are clear water species with average genus number over 40 and high diversity index value and low quantity and biomass. The water quality may classified as class 1 - 2 ; In the lower reach of the canal, whrere the diversity index decreases with an increase in quantity and biomass, the water quality may be of class 4 - 5 ; The water quality in lower reach of Beijing Effluent Sewage Stream belongs class 3 due to self-purification.

• Key words：community structure  diversity index  water pollution  water quality  dominant species

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