固城湖底栖动物群落结构及水质生态评价

Ecological assessment of zoobenthos community structure and water quality in Gucheng Lake

2015年3月～2016年2月对南京市高淳区饮用水源地固城湖开展了全年的底栖动物监测与分析,并通过Wright指数、Goodnight指数、BPI生物学指数和Shannon-Wiener多样性指数对固城湖进行水质生态评价。结果表明:全年12个月共鉴定出底栖动物21种(属),其中摇蚊科幼虫种类最多,共计11种,寡毛类8种,软体动物2种;主要优势种为苏氏尾鳃蚓(Branchiura sowerbyi)、中国长足摇蚊(Tanypus chinensis)、内摇蚊属(Endochironomus sp.)和环棱螺(Bellamya sp.)。四种指数评价结果显示固城湖水质现状处于轻度-中度污染时期,属于富营养化过程的初中期。

The monitoring and analysis of benthic zoobenthos were carried out in drinking water source of Gucheng Lake in Gaochun District,Nanjing City from March 2015 to February 2016,and the water quality ecological assessment was carried out by Wright index,Goodnight index,BPI biological index and Shannon-Wiener diversity index.The results showed that 21 species of zoobenthos were identified in 12 months of the year.Among them,the chironomidae larvae was the largest,a total of 11 species of larvae,8 species of oligochaeta,and 2 species of mollusk.The main dominant species were Branchiura sowerbyi,Tanypus chinensis,Endochironomus sp.and Bellamya sp.The results of the four indexes assessment showed that the water quality of Gucheng Lake was in a mild to moderate pollution period,which belonged to the middle and middle stages of the eutrophication process.