文献类型：期刊文献

英文题名：Microbial-mediated metal(loid) immobilization in mulch-covered tailings

作者：Jia, Yanlong Xiao, Enzong Lan, Xiaolong Lin, Wenjie Sun, Jialong Xiao, Tangfu

第一作者：贾彦龙;Jia, Yanlong

通信作者：Lan, XL[1];Lin, WJ[1]

机构：[1]Hanshan Normal Univ, Sch Chem & Environm Engn, Chaozhou 521041, Peoples R China;[2]Guizhou Inst Technol, Sch Resources & Environm Engn, Guiyang 550002, Peoples R China;[3]Guangzhou Univ, Sch Environm Sci & Engn, Guangzhou 510006, Peoples R China

第一机构：Hanshan Normal Univ, Sch Chem & Environm Engn, Chaozhou 521041, Peoples R China

通信机构：corresponding author), Hanshan Normal Univ, Sch Chem & Environm Engn, Chaozhou 521041, Peoples R China.

年份：2024

卷号：284

外文期刊名：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY

收录：;Scopus(收录号：2-s2.0-85201206973);WOS:【SCI-EXPANDED(收录号:WOS:001297131000001)】；

基金：The funding for this research was provided by multiple funding agencies, including the Guizhou Provincial Key Technology R & D Program (Project No. [2021] 492) , National Natural Science Foundation of China (Projects No. 41967041, 42307345) , Project of Educational Commission of Guangdong Province of China (Projects No. 2023KSYS007, 2023KTSCX078, 2023KCXTD023, 2020ZDZX1032) , and Scientific Research Start-up Funds of Hanshan Normal University (Project No. QD202204) .

语种：英文

外文关键词：Heavy metal; microbial community; microbial-mediated immobilization; mulch coverage; tailings

摘要：Mulch coverage of mining tailings can create anaerobic conditions and consequently establish an anoxic environment that promotes the metabolic processes of anaerobic microorganisms. This anoxic environment has the potential to decrease heavy metal mobility and bioavailability. While tailings exposed to sunlight have been extensively studied, research on the effects of microbial-mediated geochemical cycling of heavy metals in mulchcovered tailings is scarce. This study aimed to examine the effects of mulch coverage-induced alterations in the structures of tailing microbial communities on the biogeochemical processes associated with heavy metals. Mulch coverage significantly reduced the pH of the tailings and the tailings exhibited heavy metal bioavailability. Random forest analysis demonstrated that mulch coverage-induced changes in the As/Cd-contaminated fractions and nutrients (total organic carbon and total nitrogen) were the most crucial predictors of microbial diversity and ecological clusters in the tailings. Notably, different from direct metal(loid) immobilization, mulch coverage can facilitate heavy metal immobilization in tailings by promoting microbial-mediated Fe, S, and As reduction. Overall, this study demonstrated that mulch coverage of tailings contributed to a reduction in heavy metal mobilization, which can be attributed to shifts in microbial-mediated Fe, S, and As reduction processes.The study provides valuable insights into the potential of mulch coverage as a remediation strategy and underscores the importance of microbial-mediated processes in managing heavy metal pollution in tailing systems.