中文摘要：

通过田间采样和室内分析,对沈阳市细河沿岸上、中、下游3条断面上的农田表层土壤（0～20cm）Hg、Cd、Zn和Pb污染现状进行了调查和评价。结果发现,4种重金属元素含量均值分别为0.524、0.721、135.9和45.9mg·kg^-1,均高于沈阳市土壤背景值,在土壤中积累明显,且上游断面的积累程度显著高于中、下游断面,菜地和果园的积累程度高于粮田。分别应用单项污染指数和综合污染指数法评价农田重金属污染,结果表明,大部分样点Hg和Cd含量严重超出土壤环境标准值,污染突出,4种重金属元素的污染程度依次为Cd〉Hg〉Zn〉Pb。总体上,细河沿岸农田土壤重金属污染严重,属重污染区,土壤和作物已受到严重污染。

英文摘要：

The contents of Hg, Cd, Zn and Pb in the topsoil （0～20cm） of farmland on three sections of Xihe fiver outlet in Shenyang were investigated and the status of the heavy metal pollution was evaluated by the monomial and Nenerow aggregate pollution index, respectively. The results showed that contents of the four heavy metals were 0.524, 0.721, 135.9 and 45.9 mg·kg^-1, respectively, which were higher than background values of the Shenyang soil, indicating that the four elements obviously accumulated in farmland soil and the accumulation was higher on the upriver section than the middle and down fiver sections. Additionally, it was also higher in vegetable and orchard soils than grain soils. According to the evaluation results by the monomial pollution index, contents of Hg and Cd in the most sampling sites were beyond the soil environmental criterions and the pollution was very serious. Cd pollution was the most serious one, followed by Hg, Zn and Pb, and no pollution of Zn and Pb was found in the soils. P value was 4.86 estimated by Nenerow aggregate pollution index, indicating that the farmland soil investigated in Xihe river outlet had been seriously polluted by the four heavy metals and the crop had also been influenced by the pollution.