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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。
By evaluating the potential ecological risk of heavy metals in soil samples from farmland in 10 counties of Poyanghu Lake and analyzing the gray relational degree between them and 9 socio-economic indicators, the sources of heavy metal pollution were discussed. The results showed that Cd in the soils of Poyang Lake region was the most serious, exceeding the standard rate of 90%. Except for Cu exceeded in some areas, the contents of other heavy metals did not exceed the standard. Poyang Lake farmland vegetable soil to achieve a slight ecological risk, industrial more developed regions of the ecological risk of heavy metals than industrial lagging areas, industrial development has a greater impact on the spatial heterogeneity of the lake. Vegetable production, industrial development, urbanization rate, transportation development and vegetable heavy metals are highly correlated with each other, while regional GDP and pesticide use have the weakest impact on various heavy metals.