鄱阳湖区城市湖泊水质变化趋势研究——以南昌市青山湖为例

Study on water quality change trend and chlorophyll change mechanism in Poyang lake area--a case study of Qingshan lake in Nanchang city

城市湖泊是城市生态环境的重要组成部分,近年来,随着人口增加,人类活动的密集,大量城市湖泊出现富营养化、水华爆发等水污染情况.本文以环鄱阳湖区核心城市南昌市的最大城市内湖青山湖为研究对象,探索其水质现状与变化趋势.研究表明:(1)青山湖水质现状以Ⅳ、Ⅴ类水为主;各水质指标随时间变化较大,受环境影响剧烈;(2)年内水质变化明显,夏秋季节水质差于冬季和春季;(3)水质年际变化较大,较差的年份为2010年,2014年,近十年来水质整体呈好转趋势,但近两年富营养化指标有反弹趋势,值得注意;(4)污染源主要为城市雨污径流以及玉带河来水污染,可以通过工程、生物、源头截污等方式进行治理.本文通过对青山湖水质的研究,以期对城市湖泊水生态环境保护提供技术支撑.

Urban lakes plays an important part of the urban ecological environment.In recent years,with the increase of population and the intensive human activities,a large number of urban lakes appear eutrophication and other water problems.This paper takes Qingshan lake,the largest inner lake in the core city of Poyang lake area,Nanchang,as the research object,explores its water quality status and change trend,and give some suggestion on how to control the pollution.Research shows that:(1)the Qingshan lake water quality status is given priority to withⅣ,Ⅴwater;the water quality index changed greatly with time and was affected by the environment.(2)The water quality changed significantly during the year,and the water quality was worse in summer and autumn than in winter and spring.(3)The annual variation of water quality is relatively large,and the year with a poor quality is 2008 and 2014 to 2015,the overall water quality shows an improvement trend in recent ten years,but the eutrophication index has a rebound trend in the past two years,which is worth noting.(4)The pollution sources are mainly urban rain sewage runoff and water pollution from the Yudai river,which can be treated by engineering,biological and source pollution.This paper studies the water quality of Qingshan lake to provide technical support for the ecological environment protection of urban lake water.