漓江水系大型无脊椎底栖动物多样性现状调查

Diversity of Benthic Macroinvertebrate in Lijiang River Watershed

2008年2～3月调查漓江水系31个样点的大型无脊椎底栖动物，共鉴定出底栖动物82科136属169种。其中昆虫纲9目143种，占所有底栖动物种类的84．61％；个体数46959头，占所有底栖动物数量的94．86％。甲壳纲、软体动物类、寡毛类等底栖动物个体数占底栖动物总量的5．14％。漓江支流底栖动物平均分类单元数（47）是干流的3倍（15），对水质敏感的EPT平均分类单元数，支流（25）是干流的8倍（3）。漓江干流底栖动物以耐污种为主，而支流则以敏感种类为主。漓江干流和支流底栖动物多样性的差异可能与干流受污染较重有关。

A survey of the diversity of benthic macroinvertebrate in Lijiang river watershed,Guilin was conducted from February to March, 2008. A total of 169 taxa belonging to 136 genera and 82 families was indentified based on the present literatures. The insecta had 143 taxa belonging to 9 orders,made up 84.61% of the total taxa richness,46 959 individuals made up 94. 86% of total abundance,and crustacea, mollusca and oligochaeta only made up 5. 14% of total abundance. The average of total taxa richness （47） of branches was about three times of that of stem,and the average of EPT taxa richness （25） of branches was about 7 times higher than that of stems. The dominant taxa in stems were tolerant species while in branches were sensitive ones. The results implied that the pollution was the major cause of the degradation of the diversity of benthic macroinvertebrate in stem of Lijiang river.