澄迈蔬菜中硒镉铅富集特征及硒影响效应

Enrichment of Se, Cd, Pb in Vegetables in Chengmai and the Effects of Se

以澄迈6个村为对象,采集3种蔬菜及其土壤样品,测定样品中硒、镉、铅的含量,探讨蔬菜中硒、镉、铅的分布富集特征及土壤硒的影响效应。结果表明,硒、镉、铅在澄迈3种蔬菜/土壤中的分布为,蔬菜中Pb>Cd>Se,耕作土壤中Pb>Se>Cd;3种蔬菜对镉的富集性最强,硒次之,铅富集性最弱;元素种类是影响元素在土壤-蔬菜系统中分布、富集的主要因素。与我国土壤环境背景值相比,澄迈蔬菜耕作土壤中镉含量高于背景值,而铅含量低于背景值,澄迈应重视镉对农产品的潜在污染风险的防范。土壤硒对3种蔬菜富集镉具有较明显的抑制效应,而对土壤中铅具有较明显的伴生效应。

Based on the study of six villages in Chengmai, three kinds of vegetables and their soils samples were collected, and the contents of Se, Cd and Pb were determined, to study Se, Cd and Pb distribution and enrichment characteristics in vegetables as well as effects of Se in the soil. Results showed that the distribution of Se, Cd and Pb was in the order of Pb〉 Cd〉 Se in the vegetables and Pb〉 Se 〉 Cd in cultivated soil. In the vegetables, the enrichment of Cd was the strongest, followed by Se, Pb. Element kinds was the main determinant for the distribution and enrichment of elements in soil-vegetable system. Compared with the environmental background value of soil in China,Cd content in cultivated soil for vegetables in Chengmai was higher than the background value, while Pb content was less than the background value. It is suggested that Chengmai should pay more attention to the potential risks of Cd contamination on agricultural products. The data also showed that the soil Se could obviously repress the enrichment of Cd by the three kinds vegetables,however,it was obviously accompanied to the soil Pb.