环鄱阳湖区农家菜地土壤重金属风险评价及来源分析

通过评价环鄱阳湖区10个县农家菜地土壤样品重金属的潜在生态风险,分析其与9个社会经济指标间的灰色关联度来探讨重金属的污染来源。结果显示,鄱阳湖区各菜地土壤中Cd的超标情况最严重,超标率达到90%,除部分地区Cu超标外,其余重金属均未超标。鄱阳湖区农家菜地土壤达到轻微生态风险,工业较发达地区重金属生态风险较大于工业落后地区,工业发展情况对湖区的空间污染分异有较大影响。蔬菜产量、工业发展情况、城镇化率、交通业发展情况和菜地土壤不同种重金属具有较高关联度,而地区生产总值、农药使用量对各种重金属含量的影响最弱。

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

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.