关于超富集植物的新理解

New comprehensions of Hyperaccumulator

长期以来重金属超富集植物定义存在着严重的不足,新的评价系数的提出势在必行。文章在生物富集系数和转运系数的基础上创造性地提出了新的评价系数即生物富集量系数,其内涵为给定生长期内单位面积地上部分植物吸收的重金属总量与土壤含量之比。此系数的提出扩大了传统超富集植物的定义,使得富集质量分数未达某一水平,但生物量很大的植物也能作为超富集植物。这为今后超富集植物的筛选提供了一定的参考,为土壤重金属污染的植物修复工程提供了理论基础。

Phytoremediation, a technique using plants to remove pollutants from soil is a green method in recent years as it is safe and potentially cheap compared with the traditional remediation techniques. But the definition of Hyperaccumulator has a severe deficiency for a long time, so giving new coefficient will be imperative under the situation. The new coefficient namely absorption capacity coefficient is creatively putted forward based on the absorption coefficient and transformation coefficient. The coefficient is the ratio of the total of heavy metal absorbed in the above-ground tissue to the concentration in soil per unit area at given growth period. The new coefficient extends the conventional definition of hyperaccumulator. As a result, more attention should be paid to some plants that have high biomass although they may not meet the enrichment concentration standard. This will provide reference for the selection of Hyperaccumulator, and provide basic theory for the application of Hyperaccumulator to treat heavy-metal-polluted soil on a large scale.