京密运河-北京排污河浮游动物群落变化与水质关系的研究

1982—1984年对京密运河-北京排污河进行了不同季节的浮游动物生态状况调查.按照浮游动物不同时间和空间群落结构的变化,对河流水质进行生物学评价,将河流水质划分成五个等级.根据浮游动物的种类组成、数量分布特征及河流的水质状况筛选出作为京密运河及北京排污河水质污染及变化趋势的指示种类.

RELATIONSHIP BETWEEN CHANGE IN ZOOPLANKTON COMMUNITY AND WATER QUALITY OF JINGMI CANAL AND BEIJING SEWAGE STREAM

Zooplankton investigation and water quality evaluation were carried out in Jingmi Canal and Beijing Sewage Stream in various seasons during 1982 -1984. The water quality of 18 sampling stations were categorized into 5 levels according to the changes in community structure and diversity index. In the upper stations of Jingmi Canal, the fundamental characteristics of the water bodies were clear species, low quantity and high diversity index value, so the water quality in these sections may be classified as level 1-2, In the lower reaches of the canal where the bodies of water were heavily polluted by wastewater from urban districts, the diversity index values evidently declined with the decrease in species number and the increase in quantity of tolerance species, so the water quality may be of level 4-5. The water quality in the lower waters of Beijing Sewage Stream showed obvious improvement and they belong in level 3 due to self-purification.