海南农垦  ; 土壤重金属  ; 污染评价  ; 潜在生态危害

以海南农垦农产品产地土壤为研究对象，研究了土壤中As、Hg、Pb、Cd、Cr等5种重金属的含量特征，并利用单因子污染指数法、内梅罗污染指数法及潜在生态危害指数法，对该地区土壤重金属污染程度和潜在生态危害进行评价。结果表明：As、Hg、Cr平均含量高于海南省表层土壤背景值，重金属污染累积值分别为4.90、2.00、7.73；该地区土壤重金属污染空间分布不均匀，位于海南省北部地区的红明、东昌、南海、东路、南阳等基地内梅罗污染指数和Cr的单因子污染指数均大于1.00，土壤处于Cr轻度污染状态；土壤重金属潜在生态危害指数为168.70，整体表现为中等生态危害，潜在生态危害主要来自于As和Hg。

Hainan State Farms  ;  heavy metal in soil  ;  pollution assessment  ;  potential ecological hazards

The soil contents of As, Hg, Pb, Cd and Cr in the agricultural producing areas of Hainan States Farms were analyzed, and the pollution and potential ecological hazards of heavy metals were assessed by means of single factor pollution index, nemerow pollution index and potential ecological risk index. The results showed that the average contents of As, Hg and Cr were higher than the background values of the surface soil in Hainan with their accumulated values being 4.90, 2.00 and 7.73, respectively. The spatial distribution of heavy metals pollution in the soil was uneven. The nemerow pollution index and the Cr single factor pollution index of Hongming, Dongchang, Nanhai, Donglu and Nanyang in the north areas of Hainan were higher than 1.00, which showed a slight Cr pollution. The potential ecological risk index of heavy metals in the soil was 168.70, which showed an intermediate ecological hazard, and heavy metals As and Hg were primary factors.