INRA USC1328, LBLGC EA 1207, University of Orleans, rue de Chartres, BP 6759, 45067, Orléans Cedex 2, France.
Environmental Consulting Engineering, IDDEA, 45160, Olivet, France.
Environ Geochem Health. 2022 Apr;44(4):1229-1244. doi: 10.1007/s10653-021-01153-0. Epub 2022 Jan 7.
Metal(loid) soil pollution causes environmental and health issues, and thus those sites need to be remediated. This can be done through phytostabilization, in combination with biochar amendment. The objectives were to investigate the potential of Salix viminalis L. associated with Trifolium repens L. for the phytostabilization of biochar-amended contaminated soils by assessing (1) the tolerance of both plants to metal(loid)s, through the biomass production, (2) the concentrations of metal(loid)s in plant parts and (3) the concentrations of metal(loid)s in soil pore water and percolation waters. Results showed that plant growth affected soil pore water Physico-chemical properties and metal(loid) mobility. When comparing the mono- and poly-cultures, although pH was higher with the polyculture than the monoculture, the decrease in Pb mobility did not differ. Moreover, the leachate analysis showed that As concentration in the soil particles leached from the soil was higher in the polyculture condition, while Pb concentration was the highest in the willow vegetated condition. Finally, willow dry weight was not affected by the presence of clover, while clover dry weight was lower when it was grown with willow. In conclusion, the results showed that the willow and clover polyculture was not better than the monoculture of these two species for the phytomanagement of a former mine site amended with biochar.
金属（类）土壤污染会引发环境和健康问题，因此需要对这些场地进行修复。可以通过植物稳定化结合生物炭改良来实现这一目标。本研究的目的是通过评估（1）两种植物对金属（类）的耐受性，包括生物量的产生，（2）植物各部分的金属（类）浓度，以及（3）土壤孔隙水和渗漏水的金属（类）浓度，来研究柳枝稷和三叶草联合用于生物炭改良污染土壤的植物稳定化潜力。结果表明，植物的生长会影响土壤孔隙水的物理化学性质和金属（类）的迁移性。与单种和混种相比，尽管混种的 pH 值比单种高，但 Pb 的迁移性下降没有差异。此外，淋溶分析表明，从土壤中淋滤出的土壤颗粒中的 As 浓度在混种条件下较高，而 Pb 浓度在柳树植被条件下最高。最后，柳树的干重不受三叶草的存在影响，而当柳树和三叶草混种时，三叶草的干重较低。总之，研究结果表明，在生物炭改良的前矿区，柳树和三叶草混种并不优于这两种植物的单种种植，用于植物管理。
