水生态学杂志2017，Vol.38Issue(2)：17-24,8.
滆湖湖滨带生态修复技术初步研究
Ecological Restoration Technology Applied in the Lakeside Zone Demonstration Project of Gehu Lake
摘要
Abstract
Gehu Lake, located upstream of Taihu Lake, is the second largest lake in southern Jiangsu Province.Historically, it was a typical shallow macrophytic lake and played an important role in protecting water quality in Taihu Lake.However, large scale reclamation in the littoral zone beginning in the 1970's and the hardening of levees in the 1990's has seriously damaged the biological resources of the lake.Since 2008, Gehu Lake has been a turbid algae-dominated lake and large scale cyanobacterial blooms occur every year.The lakeside zone is a natural barrier, intercepting exogenous terrestrial pollutants and providing valuable habitat.In 2008 and 2009, we established an ecological restoration demonstration project in the riparian zone along the mouth of Tai-Ge canal, connecting Gehu Lake to Taihu Lake.This article is a detailed introduction to the demonstration project and the goal is to provide a useful reference for remediating littoral ecology and improving water quality in shallow lakes.The demonstration area, enclosed by netting, was 28.67 hm2 and ten sampling stations (Stations A-J) were monitored.There were no macrophytes in the demonstration area and herbivorous fish were removed by gill net before the investigation began.In March of 2008, three experimental areas (Station A, B and C) were established in the eastern section of the project area and floating plants, macrophytes and emergent aquatic plants were introduced.In February of 2009, another three experimental areas (Station F, G and H) were established in the northern section of the project area and submerged plants and a smaller number of floating plants were introduced.During the investigation, silver carp (Hypophthalmichthys molitrix), bighead carp (Aristichthys nobilis), Xenocypris microlepis and triangle sail mussel (Hyriopsis cumingii) were released to the project area.To evaluate the effect of the ecological restoration project and analyze the nutrient reduction efficiency of different bioremediation techniques, we investigated the change in the phytoplankton and zooplankton communities and monitored water quality parameters.Water quality at Station A, B, C, D (central demonstration area) and E (control station, 1 500 m from the demonstration project) was monitored monthly in 2008 and then at Station F, G, H, I and J (the same locations as Station D and E) in 2009.Water quality monitoring results show that the comprehensive pollution indices in the demonstration project area ranged from 1.76 to 1.79 in 2008-2009, while the comprehensive pollution indices at the control station ranged from 2.03 to 2.09.The higher pollution indices at the control site indicates the ecological remediation project did improve water quality, although it remained heavily polluted.The floating plant-dominated wetland community developed well and played an important role in nutrient reduction.The average removal rates of total nitrogen (TN), total phosphorus (TP) and ammonia nitrogen (NH3-N) in the trial zone were, respectively, 26.52%, 27.92%, and (46.15-68.12)% compared with the control station.However, chlorophyll-a and the potassium permanganate index (CODMn) in the demonstration area were higher than at the control station.The enclosures within the demonstration project area removed TP most effectively (37.06%).Stocking silver carp and bighead carp effectively suppressed cyanobacterial blooms in the demonstration project area.关键词
湖滨带/水生动物/水生植物/生态修复/滆湖Key words
lakeside zone/aquatic animal/aquatic macrophyte/ecological restoration/Gehu Lake分类
资源环境引用本文复制引用
孔优佳,徐东炯,刘其根,胡忠军..滆湖湖滨带生态修复技术初步研究[J].水生态学杂志,2017,38(2):17-24,8.基金项目
江苏省科技惠民工程项目(BE2008640). （BE2008640）
