苏州河底栖动物群落恢复过程动态研究

2000年10月至2003年4月,对苏州河8个采样点的底栖动物群落恢复状况的调查结果表明,苏州河底栖动物群落优势种主要为铜锈环棱螺、梨形环棱螺、中华颤蚓和霍甫水丝蚓,种类数比1999年有所增加,但仍以耐污种为主。对不同水体间生态环境的对比分析表明,底栖动物群落结构与水体污染程度之间具有较强的相关性,由此建立了底栖动物恢复指数,该指数可以客观地指示底栖动物群落恢复的动态过程。结合历史资料研究显示,苏州河底栖动物恢复指数呈持续上升趋势,恢复迹象比较明显。

Dynamic restoration process of zoobenthos communities in Suzhou Creek

After years of treatment and management,the ecosystem of the Suzhou Creek is becoming healthier gradually.Surveys were carried out at 8 sampling sites along the creek in the period from October 2000 to April 2003.Findings of the surveys indicate that Bellamya aeruginosa,Bellamya purificata,Tubifex sinicus,and Limnodrilus hoffmeisteri were the predominant species in the zoobenthos communities in the creek.Though the communities were composed of more species than in 1999,they were still mostly pollution-tolerant ones.Comparison analysis of different aquatic ecosystems show that the structure of the zoobenthos communities is closely related to the pollution degree.Based on the correlation,a zoobenthos restoration index was established,objectively reflecting dynamic processes of the restoration of the zoobenthos community structure.Presently,the index of the Suzhou Creek shows a rising trend,and the restoration is obvious.