Improvement Effects of Ecological Restoration Project ‘returning Fishery to Lake’on the Water Environment of Dalian Lake in Shanghai．

27 Mar Improvement Effects of Ecological Restoration Project ‘returning Fishery to Lake’on the Water Environment of Dalian Lake in Shanghai．

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Abstract

于 2010 年 4 月—2011 年 2 月逐月对上海大莲湖退渔还湖生态修复工程跟踪调查 与监测，对工程前后大莲湖水环境理化指标进行分析比较，评估工程修复之后大莲湖水环 境的改善效果。生态修复区内 TP、 TN、 NO3 － -N、 NH4 + -N 和 COD 比工程区外对照点分别降 低了 62． 5% 、 72． 2% 、 92． 9% 、 63． 3% 和 8． 9% ，溶解氧提高了 11． 1% ，叶绿素 a、 浮游植物丰 度和浮游植物生物量分别比工程区外降低了 47． 7% 、 15． 3% 和 48． 0% ; 生态修复工程区综 合水质标识指数达到国家Ⅲ类水标准，而工程区外为Ⅳ类水; 出水水质明显优于进水水质。 修复工程区浮游植物区系得到良好改善，水生态系统具备了一定的自净能力。

English Abstract

From April 2010 to February 2011， a monthly tracking survey and monitoring was conducted on the ecological restoration project ‘returning fishery to lake’of Dalian Lake in Shanghai， with the physical and chemical indicators of water environment before and after the implementation of the engineering project compared， aimed to assess the improvement effects of the project on the water environment． As compared with those outside the ecological restoration area， the concentrations of total phosphorous， total nitrogen， NO3 － -N， and NH4 + -N and the COD in the ecological restoration area decreased by 62． 5% ， 72． 2% ， 92． 9% ， 63． 3% ， and 8． 9% ， respectively， while the DO increased by 11． 1% ． In addition， the concentration of chlorophyll a and the abundance and biomass of phytoplankton in the restoration area decreased by 47． 7% ， 15． 3% ， and 48． 0% ， respectively． The integrated water quality identification index of the ecological restoration area was of National class Ⅲ， while that of the control point was of class Ⅳ, and the outlet water quality of the ecological restoration area was obviously better than the inlet water quality． After the implementation of the restoration project， the phytoplankton flora in the restoration area was improved， and the water ecosystem had definite self-purification capacity．