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Risk Evaluation and Sources Analysis of Heavy Metals in Vegetable Field Soil of Rural Area Around Poyang Lake

HU Chun-hua 1,2,JIANG Jian-hua 1,2,ZHOU Wen-bin 1,2(1.Institute of Environmental and Chemical Engineering,Nanchang University,Nanchang,Jiangxi 330031,China;2.Key Laboratory of Lake Poyang Environment and Resource Utilization,Ministry of Education,Nanchang,Jiangxi 330029,China)  
The ecological risk of heavy metals of 10 counties in the rural area around the Poyang Lake were evaluated,and then pollution sources of heavy metals were analyzed through the gray correlation between heavy metal and nine socio-economic indicators.Results showed that Cd contents of vegetable soil around Poyang Lake were severely exceeded the national standard with an excessive rate of 90%.The other heavy metals were not exceeded excepting contents of Cu in some areas.Ecological risk of the vegetable soil around Poyang Lake area is slight,and the total risk index was contributed most by Cd,accounting for 66.53% ~ 97.30%.The ecological risk of developed regions around the Poyang lake were higher than lower industrial level regions,indicating that industrial development make a important influence on the spatial variation of heavy metal pollution in soil around Poyang Lake.The socio-economic indices of vegetable production,industrial development,urbanization,transportation development have high grey correlation with heavy metals contents,and GDP and the amount of pesticides use show a weakest impact on heavy metals.
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