南京城市湖泊湿地的水质动态及其评价

The Dynamics of Water Quality of Urban Wetland and Its Assessment

选取南京市玄武湖、莫愁湖、内秦淮河湿地为对象,通过定点、定时采样和水质分析等方法,对城市湖泊湿地水质的季节动态、水质影响因素及其富营养化评价等进行了研究。结果表明,TN、TP、BOD和COD是反映城市湖泊水体污染度的重要指标,TP含量过高是造成城市河湖湿地水体富营养化的主要原因。水体污染程度随季节动态表现为:夏季>春季>秋季>冬季。相对封闭的莫愁湖湿地水质的季节变化较小,但水质较差,各个季节均表现出重富营养化—严重富营养化状态;受工业或生活污水影响较大的内秦淮河湿地,水体受污染严重,全年均属严重富营养—异常富营养化;玄武湖湿地的水体,在春季和秋季均已达到富营养化水平,夏季相对较好,TN、TP为富营养化水平,其余指标为中—富营养水平。

Xuanwu Lake,Mochou Lake and Inner Qinhuai River in Nanjing City were investigated to assess the seasonal dynamics,impacting factors and eutrophication of water quality in urban wetlands by analyses of water samples from different sites and times.The water purification capability of different aquatic plants was also tested through potted experiment.Results indicated that TN,TP,BOD and COD are key indicators to reflect water pollution of urban wetlands.High TP content is the main cause for eutrophication of urban wetland water.The seasonal changes of the extent of water pollution are in the order：summerspringautumnwinter.The water quality in winter is much more stable than those of other seasons because of lower temperature.Comprehensive analysis of annual water quality revealed that the water quality of Inner Qinhuai River was in the state of serious eutrophication,Xuanwu lake was the best in water quality followed by Mochou Lake.