鄱阳湖湿地环境质量分异及风险表征

根据实地采样分析、现场调查及相关资料,获取鄱阳湖相关水质、生态数据,运用统计学、环境风险评价方法对鄱阳湖污染物空间分异及风险表征进行了量化分析,初步得出结论:鄱阳湖各入湖河口,主要污染物为氨氮、石油类、镉、挥发酚等.pH值除乐安河口、信江东支河口较低外,其他入湖河口都在6.0左右浮动.鄱阳湖全湖水质处于中等营养化水平.3月份DO与COD呈正相关,但拟合曲线显著性检验和方差分析不显著,而11月份呈负相关性,显著性检验较好;3月份和11月份DO与BOD,COD与BOD都呈正相关,方差检验不显著.波阳和康山样地重金属含量最高,鄱阳湖样地和东源样地重金属综合含量(东源样地As含量略高)位于最后,湖口和石钟山样地Pb含量普遍高于其他样地.各研究区风险分析综合评价指数大小顺序是:康山>波阳>湖口>九江>南矶山>鄱阳湖样地.

Environmental quality differences and risk characterization of wetlands in Poyang Lake

Through field sampling analysis,investigation and correlating information,the water quality,ecological data were obtained.The statistical and environmental risk evaluating methods were used to quantitivly analyse the space differences and risk characterization s of the pollutants in Poyang Lake,and then results were gotten:(1)at the estuaries of Poyanglake,the main pollutants were ammonia,petrol,cadmium,volatilizing hydroxybenzenes,and so on.(2)pH of estuaries were fluctuating at the point of 6.0,except that of Yongle and Xindong branch estuary was lower.Although the content of SO~(2-)_4 and Cl~-were in the natural range,but that of Yongle and Xindong branch estuary was higher because of the mining and smelting industry in Yanan.(3)The whole water quality indicator of Poyang Lake:PO~(3-)_4 0.129 mg/L,Cl~-7.10 mg/L,NO~-_35.88 mg/L,SO~(2-)_416.54 mg/L,NO~-_2<0.01 mg/L,SD:3.32 mg/L,pH=5.7,at the mediate nutrition level.(4)DO and COD were positive correlating in Mar.but the drafting curves testing and deviation analysis both were not significant;and in Nov.the two were negative correlating,P=0.354 9,significant;DO and BOD,COD and BOD in Mar.and Nov.both were positive correlating,the result of deviation testing is not significant.(5)the heavy metal content in Boyang and Kangshan were at the top,and that of Poyang Lake and Donyuan sampling sites were at the end,the content of Pb in the jaws of Poyang Lake and Shizhongshan sampling sites were higher than that of other sampling sites,the result of risk index analysis also show the same situation.(6) the order of the integrative evaluating index of risk analysis:Kangshan>Boyang>Lake jaws>Jiujiang>Nanjishan>Dongyuan>Poyang Lake sites.