白洋淀底栖动物多样性调查及水质评价

底栖动物对环境变化反应敏感，当水体受到污染时，底栖动物群落结构及多样性将会发生改变。为了解白洋淀的底栖动物组成及水质状况，作者于2006年12月、2007年3月至11月对白洋淀9个采样点的底栖动物进行了采样调查。共鉴定出底栖动物23种，其中软体动物17种，环节动物2种，水生昆虫幼虫4种，与1958年的调查结果对比可以发现物种种类数呈降低趋势。其中中国圆田螺、中华圆田螺、绘环棱螺、摇蚊幼虫为全年分布种。应用香农-威纳多样性指数对水质进行分析，可以看出白洋淀为重、中污染。

Survey on zoobenthos diversity in Baiyangdian Lake and evaluation on water quality

To study the zoobenthos and water quality in Baiyangdian Lake, a preliminary survey of zoobenthos in Baiyangdian Lake was carried out during December 2006, March to November 2007. A total of 23 Zoobenthic species, belonging to 3 phyla, were observed, including17 mollusca species, 2 annelida and 4 aquatic insects, which is a reduction compared to the last survey in 1958. Zoobenthos of Cipangopaludina chinensis (Gray), C.cathayensis (Heude), Bellamya.limnophila (Mabille) and Chirono-mus grplumosus Linn were found all the year round. The water quality was assessed by shannon-wiener index. The result shows that most parts of water are of moderate pollution except the sampling site of Yuanyangdao which was seriously polluted.