龙葵
植物修复
超量积累植物
化学
开枪
镉
根际
土壤污染
螯合作用
园艺
铵
环境化学
植物
污染
生物
重金属
有机化学
生态学
遗传学
细菌
作者
Wei Yang,Huiping Dai,Shuhe Wei,Brett Robinson,Jianming Xue
出处
期刊:Chemosphere
[Elsevier]
日期:2024-03-01
卷期号:352: 141317-141317
标识
DOI:10.1016/j.chemosphere.2024.141317
摘要
The efficacy of using plants to phytoremediate heavy metal (HM) contaminated soils can be improved using soil amendments. These amendments may both increase plant biomasses and HMs uptake. We aimed to determine the composite effect of ammonium sulfate ((NH4)2SO4) combined with the application of an aqueous stem-extracted bio-chelator (Bidens tripartita L) on the plant biomasses and cadmium (Cd) phytoextraction by Solanum nigrum L. The constant (NH4)2SO4 application mode plus bio-chelator additives collectively enhanced the shoot Cd extraction ability owing to the increased plant biomass and shoot Cd concentration by S. nigrum. The shoot Cd extraction and the soil Cd decreased concentration confirmed the optimal Cd phytoextraction pattern in K8 and K9 treatments (co-application of (NH4)2SO4 and twofold/threefold bio-chelators). Accordingly, Cd contamination risk in the soil (2 mg kg−1) could be completely eradicated (<0.2 mg kg−1) after three rounds of phytoremediation by S.nigrum based on K8 and K9 treatments through calculating soil Cd depletion. The microorganism counts and enzyme activities in rhizosphere soils at treatments with the combined soil additives apparently advanced. In general, co-application mode of (NH4)2SO4 and aqueous bio-chelator was likely to be a perfect substitute for conventional scavenger agents on account of its environmental friendliness and cost saving for field Cd contamination phytoremediation by S. nigrum.
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