水生态学杂志2016，Vol.37Issue(1)：39-46,8.DOI:10.15928/j.1674-3075.2016.01.006
引水对太湖贡湖湾有机污染时空变化的影响
Effect of Water Diversion on Spatial-temporal Dynamics of Organic Pollutants in Gonghu Bay, Lake Taihu
摘要
Abstract
The permanganate index ( CODMn ) and total organic carbon ( TOC) directly reflect the degree of organic pollution in lakes and water quality improvement in lakes is closely related to the decrease in organic pollution.Ex-ogenous inputs and cyanobacterial blooms are the primary source of organic pollution to Lake Taihu.The project to divert water from the Yangtze River to Lake Taihu, used as an emergency measure to relieve algae blooms and en-sure the safety of water in the Lake Taihu basin, has now been operating on a regular basis.To assess effects of the water diversion on the spatial-temporal dynamics of pollutants in Lake Taihu, we investigated and compared differ-ences in the concentrations of chlorophyll a ( Chl-a) , CODMn and TOC in western, central and eastern Gonghu Bay during wet, transition and dry seasons from 2013 to 2014.Water samples were collected at 16 sites in August of 2013, and January and November of 2014.Sites W1-W5 were located in western Gonghu Bay, C1-C5 at bay center, Sites E1-E5 in the eastern bay, and Site R in Wangyu River, flowing into northeast Gonghu Bay and the primary channel for the input of diverted water .Water temperature and dissolved oxygen at each site were measured in situ.Organic pollutant concentrations in Wangyu River were lower than those in Lake Taihu during water diver-sion periods in all three seasons.Spatial concentration gradients for Chl-a, CODMn and TOC all displayed an in-creasing concentration from the outlet of Wangyu River to the mouth of Gonghu Bay, indicating that the water diver-sion significantly reduces organic pollutant levels in Lake Taihu and the improvement was most pronounced at the Wangyu River outlet.Influenced by the southeast monsoon and increased flow, chlorophyll a and CODMn in western Gonghu Bay were significantly higher than in other areas.The relative reductions were all highest in autumn:51.4%, 83.4%and 57.9%, respectively, for Chl-a, CODMn and TOC, followed by winter and then summer. Furthermore, the reduction in Chl-a was also evident in summer.The decrease in organic pollutant levels resulting from the water diversion from the Yangtze River to Wangyu River and Gonghu Bay also produces significant changes in the spatial-temporal dynamics.关键词
引水/太湖/贡湖湾/有机污染/时空变化Key words
water diversion/Lake Taihu/Gonghu Bay/organic pollutants/spatial-temporal dynamics分类
资源环境引用本文复制引用
戴江玉,吴时强,吕学研,杨倩倩,吴修锋,周杰,薛万云,王芳芳..引水对太湖贡湖湾有机污染时空变化的影响[J].水生态学杂志,2016,37(1):39-46,8.基金项目
国家水体污染控制与治理科技重大专项项目（2012ZX07506-003-04）；国家自然科学基金项目（51309156；51479120；51479121）；水利部公益性行业科研专项经费项目（201301041；201501015-01）；中国博士后科学基金项目（2014M561687）；江苏省博士后科研资助项目（1401105C）；浙江省水利厅科技项目（RB1207）。 （）
