Saison Carine, Schwartz Christophe, Morel Jean-Louis
Laboratoire Sols et Environnement, Vandoeuvre-lès-Nancy, France.
Int J Phytoremediation. 2004;6(1):49-61. doi: 10.1080/16226510490439981.
The aim of this work was to study, in a rhizobox experiment, the phytoextraction of metals by the hyperaccumulator plant Thlaspi caerulescens in relation to the heterogeneity of metal pollution. Six treatments were designed with soils containing various levels of metals. Homogeneous soils and inclusions of soils in other soil matrices were prepared in order to vary metal concentration and localization. Growth parameters of the plant (rosette diameter and shoot biomass) and localization of roots and shoot uptake of Zn, Cd, Ca, and Mg were determined after 10 weeks of growth. The plants grown on the polluted industrial soils provided a larger biomass and had lower mortality rates than those grown on the agricultural soil. Moreover, these plants accumulated more Zn and Cd (up to 17,516 and 375 mg kg(-1) DM, respectively) than plants grown on the agricultural soil (up to 7300 mg Zn kg(-1) and 83 mg Cd kg(-1) DM). The roots preferentially explored metal-contaminated areas. The exploration of polluted soil inclusions by the roots was associated with a higher extraction of metals. Zinc and Cd in the shoots of Thlaspi caerulescens were negatively correlated with Ca and Mg concentrations; however, the soil supply for these two elements was identical. This suggests that there is competition for the uptake of these elements and that Zn is preferentially accumulated.
这项工作的目的是在根箱试验中研究超积累植物天蓝遏蓝菜对金属的植物提取作用与金属污染异质性之间的关系。设计了六种处理，使用含有不同金属含量的土壤。制备了均质土壤以及将土壤包含在其他土壤基质中的样本，以改变金属浓度和分布。生长10周后，测定了植物的生长参数（莲座直径和地上部生物量）以及根的分布和地上部对锌、镉、钙和镁的吸收情况。生长在污染工业土壤上的植物比生长在农业土壤上的植物生物量更大，死亡率更低。此外，这些植物积累的锌和镉（分别高达17516和375毫克/千克干物质）比生长在农业土壤上的植物（锌高达7300毫克/千克、镉高达83毫克/千克干物质）更多。根优先探索金属污染区域。根对污染土壤夹杂物的探索与更高的金属提取量相关。天蓝遏蓝菜地上部的锌和镉与钙和镁的浓度呈负相关；然而，这两种元素的土壤供应量相同。这表明这些元素在吸收过程中存在竞争，并且锌被优先积累。
