宝山区农用土壤中重金属的监测与评价

在研究的8种重金属元素中,Cd、Cr、Cu、Pb、Zn、Ni的平均值都超过上海市土壤背景值,但均低于国家土壤环境二级标准。与上海优质农产地环境标准相比较,重金属含量平均值超过标准的有Cr、Pb、Zn,但研究区土壤中8种重金属含量的平均值均低于绿色食品产地环境技术条件和无公害食品产地环境技术条件。宝山区7个城镇农业土壤按多因子潜在生态危害指数评价,庙行镇的生态风险指数最高,月浦镇的生态风险指数最低。从宝山区农田土壤重金属含量的整体情况来看:多因子潜在生态评价值为119.08,宝山区农田土壤达到轻微生态危害。

Monitoring and Assessing of Heavy Metals in Agricultural Soils in Baoshan District

In Baoshan District of Shanghai, eight heavy metals in agricultural soils are investigated, of which the average contents of six metals, i. e. , Cd, Cr, Cu, Pb, Zn and Ni are higher than the Shanghai soil background values, but lower than the national secondary standards of soil environment. Compared with the soils with quality agricultural products in Shanghai, the metals of Cr, Pb and Zu are higher than the standards, while the contents of all the eight heavy metals are lower than the environmental conditions of soils producing Green foods and safe foods. According to the multi-factor assessment of potential ecological hazard for agricultural soil in seven towns of Baoshan District, the maximum and minimum results appear in Miaohang Town and Yuepu Town respectively. From overall situation of heavy metals in agricultural soils in Baoshan District, the value of multi-factor assessment for potential ecological hazard is 119. 08, belonging to slight ecological harm.