洪湖底栖动物群落结构及其对水质的初步评价

THE COMMUNITY STKUCTURE OF BENTHIC MACROINVERTEBRATES AND THE ASSESSMENT OF WATER QUALI-TY IN HONGHU LAKE

作者在１９８８－１９８９年对洪湖４次采样中共发现底栖动物７１种（属），其中软体动物２０种，寡毛类１０种，水生昆虫２６属，甲壳钢、蛭钢等种类１５种。洪湖底栖动物现存量在湖内的不同区域间存在较大的差异，其季节波动亦明显。洪湖底牺动物全年平均为５０２ｉｎｄ．／ｍ￣２，３５．４７ｇ／ｍ￣２。作者利用底栖动物群落结构进行水质的生物学评价，认为洪湖水体受到轻－中度程度的有机污染。另外，水质的化学测定与生物学评价一致。

Benthic macroinvertebrates in Honghu Lake were investigated from April 1988to October 1989.In total,71 species(genera)of zoobenthos were collected, of which, 20 species were molluses,10 species aquatic oligochaetes, 26 genera aquaticinsects and 15 species others. Differences were observed in the standing-crops of zoobenthos among differentsample areas, and so were the seasonal changes in the standing-crops. The averagevalues of density and biomass of zoobenthos in the whole lake were 502 ind./m￣2,35.47g/m￣2 respectively. The community structure of zoobenthos was used for biological assessmentof water quality.It revealed that the water in Honghu Lake was polluted to light-moderate extent by organic materials.Furthermore, chemical monitoring of water quality was identical with biological assessment.