Remediation mechanism of high concentrations of multiple heavy metals in contaminated soil by Sedum alfredii and native microorganisms  

作　　者：Zihe Wang Han Zhang Ying Xiong Lieyu Zhang Jianglong Cui Guowen Li Caili Du Kaiyang Wen 

机构地区：[1]State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China [2]Beijing Water Science and Technology Institute,Beijing 100044,China [3]School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China

出　　处：《Journal of Environmental Sciences》2025年第1期179-188,共10页环境科学学报(英文版)

基　　金：supported by the Fundamental Research Funds for Central PublicWelfare Scientific Research Institutes of China(No.2021-JY-37);the Yellow River Basin Ecological Protection and High-quality Development Joint Study(Phase I)(No.2022-YRUC-01-0202).

摘　　要：Pollution accident of nonferrous metallurgy industry often lead to serious heavy metal pollution of the surrounding soil.Phytoremediation of contaminated soil is an environmental and sustainable technology,and soil native microorganisms in the process of phytoremediation also participate in the remediation of heavy metals.However,the effects of high concentrations of multiple heavy metals(HCMHMs)on plants and native soil microorganisms remain uncertain.Thus,further clarification of themechanism of phytoremediation of HCMHMs soil by plants and native soil microorganisms is required.Using the plant Sedum alfredii(S.alfredii)to restore HCMHM-contaminated soil,we further explored the mechanism of S.alfredii and native soil microorganisms in the remediation of HCMHM soils.The results showed that(i)S.alfredii can promote heavy metals from non-rhizosphere soil to rhizosphere soil,which is conducive to the effect of plants on heavy metals.In addition,it can also enrich the absorbed heavy metals in its roots and leaves;(ii)native soil bacteria can increase the abundance of signal molecule-synthesizing enzymes,such as trpE,trpG,bjaI,rpfF,ACSL,and yidC,and promote the expression of the pathway that converts serine to cysteine,then synthesize substances to chelate heavy metals.In addition,we speculated that genes such as K19703,K07891,K09711,K19703,K07891,and K09711 in native bacteria may be involved in the stabilization or absorption of heavy metals.The results provide scientific basis for S.alfredii to remediate heavy metals contaminated soils,and confirm the potential of phytoremediation of HCMHM contaminated soil.

关 键 词：Microbial remediation PHYTOREMEDIATION Sedum alfredii 

分 类 号：X53[环境科学与工程—环境工程]