海南岛东部主要农作物和土壤中重金属的相关性及富集特征研究

采用野外采样和室内分析的方法，对海南岛东部主要农作物和土壤中重金属元素含量进行了分析，结果表明研究区土壤中As（变异系数1.58）的含量很不稳定；Zn和Pb的含量比较均匀，土壤中重金属间均为正相关可能具有同源性。水稻和胡椒中重金属的变异系数均小于0.50，重金属含量比较均匀。槟榔鲜果中As的（变异系数1.20）含量很不均匀，Zn和Pb的分布比较均匀。水稻、胡椒和槟榔鲜果中重金属间有正相关关系，也有负相关关系，但胡椒和槟榔鲜果中正相关显著多于负相关，重金属间存在明显协同吸收。农产品中重金属主要来源于土壤吸收，但槟榔鲜果部分重金属元素含量高于其土壤元素。水稻和胡椒对Zn、Cr、As、Pb、Cu和Cd 6种重金属元素的富集能力较弱，但槟榔鲜果对6种重金属元素的富集能力较强。

Heavy Metals in Main Crops and Soil in East Hainan: Enrichment Characteristics and Correlation Analysis

By outdoor sample collection and indoor analysis, the heavy metal contents of main crops and soil in east Hainan were analyzed. The results showed that soil As was unstable with the variable coefficient of 1.58, and the contents of Zn and Pb were more uniform in the study area. The soil heavy metals were positively correlated, which might have homology. The variable coefficient of heavy metals was less than 0.50 in rice and pepper, and the content of heavy metals was uniform. The variable coefficient of As (1.2) was unstable in Areca catechu, with nonuniform content, while the contents of Zn and Pb were uniform. There were positive and negative correlations among the heavy metals in rice, pepper and Areca catechu, but the number of positive correlations was more than that of negative correlations in pepper and Areca catechu. There was obvious synergistic absorption among the heavy metals. Heavy metals in agricultural products mainly came from soil absorption, however, the content of heavy metals in fresh Areca catechu was higher than that in soil. The enrichment ability of rice and pepper to Zn, Cr, As, Pb, Cu and Cd was weak, but that of Areca catechu was relatively strong.