用原生动物评价黄河兰州段的水质

ASSESSMENT OF POLLUTION IN LANZHOU REACH OF HUANGHE RIVER BY USING PROTOZOAN COMMUNITIES

报导了黄河兰州段的原生动物１５７种。根据原生动物群落构成特点；优势种群；污生指数和功能类群等指标对水质污染程度进行了评价，其各样点污染顺序是：库心（β_ｍ）＜小川（β_ｍ－α_ｍ）＜新城桥（α_ｍ）＜湟水桥（α_ｍ）＜中山桥、包兰桥（α_ｍ－ｐ_ｓ）。这一评价结果与理化分析、底栖无脊椎动物和大肠杆菌的评价结果基本一致，表明原生动物可以作为宏观评价黄河水体污染程度的指示生物。

The article is based on an initial study of the formation of protozoan in Lanzhou reach of Huanghe River.The research work was conducted from April to October, 1991. A microscopic examination has been made on 6 specimens collected from 6 areas(1', 2', 3', 4', 5'and 6')of different water quality.It's found that 157 species of protozoa belong to 7 classes.According to the characteristics of peotozoan communities, the dominant species, the functional groups and the pollution indexes' it indicates that the water quality. Pollution sequence in this river reach is: 1'(β-mesosaprobic zone)<2′(-mesosaprobic zoneα-mesosaprobic zone)<4 (a-mesosaprobic zone) <3′(a-mesosaprobic zone)<5′,6′(a-mesosaprobic-polysaprobic zone). This assessment result is in line with those of physico-chemical analysis and the assessment of colon bacillus and benthic invertebrate. The result shows thet protozoa is a pollution-indicating organism for evaluation of the pollution of freshwater quality.