摘要： 采用不同提取剂对蔬菜土壤中多种重金属元素的生物有效性,以及有效态重金属与全量重金属的相关性进行了研究。结果表明:在同一土壤环境中,不同重金属元素间的生物有效性存在较大差异,依次为Cd>Pb>Hg>As>Cr,有效性系数较高的是Cd和Pb元素,分别为43.36%,6.57%,而Cr最低,仅为0.15%,表明土壤中有效态Cd、Pb容易发生迁移并被蔬菜吸收富集,存在较大的潜在生态污染风险;蔬菜地耕层土壤的有效态重金属与全量重金属呈高度显著线性相关的是Cd元素,其相关回归方程为Y=1.598 9X+0.046(n=108,R=0.866),呈显著线性相关的是Pb(R=0.769)和As(R=0.671)元素,相关性不显著的为Cr和Hg元素,表明土壤有效态Cd、Pb和As元素可作为重要的客观来指示环境污染对土壤冲击。

关键词: 蔬菜土壤, 重金属, 生物有效性, 有效态, 全量, 相关性

Abstract: Taking different extraction solvents to study the bioavailability of various heavy metal elements and correlation between the available concentration and the total in vegetable soil.The result indicates that there was considerable diversity in the bioavailability of different heavy metal elements.The sequence was CdPbHgAsCr,the higher were Cd and Pb,the bioavailability coefficient of them were 43.36% and 6.57%.whereas the lowest was Cr,it was barely 0.15%.It was showed that available Cd and Pb in soil easily transported and accumulated by vegetable,moreover there was potential ecological risk.There was a very notable linear correlation between available Cd and total Cd in vegetable soil of tillage layer,its regression was Y=1.598 9X+0.046(n=108,R=0.866).Available Pb and total Pb exist in linear correlation,the coefficient correlation was 0.769.Available As and total As exist in linear correlation,the coefficient correlation was 0.671.There was no linear correlation between the available concentration and the total with Cr and Hg.Available Cd,Pb and As could be considered as the significant and impersonal indicators of enviornmental stress of heavy metal on soil.

Key words: Vegetable soil, Heavy metal, Bioavailability, Available, Total, Correlation

中图分类号: 

• S15