Soil microbial community in lead smelting area and the role of sulfur-oxidizing bacteria
The long-term operation of the lead smelter has brought serious heavy metal pollution to the surrounding soil.The microbial community structure and composition of heavy metal contaminated soil is important for the risk assessment and pollution remediation.In this study,a lead smelter operating for more than 60 years was used to investigate the effects of heavy metal pollution on soil microbial community structure and composition in vertical profile.The results showed that the heavy metal content decreases gradually with increasing vertical depth of the soil.The diversity of soil microbial community with moderate pollution was higher than that with low pollution.Regardless of the pollution level,the diversity of soil microbial community was higher in the surface layer than in the bottom layer.The dominant relative abundance genera include Perlucidibaca,Limnobacter,Delftia,Hydrogenophaga,Thiobacillus,Sulfurifustis and Sphingopyxis,showing a higher abundance of sulfur-oxidizing bacteria(SOB).XRD results showed the presence of PbSO4 in soil,may be due to the enrichment of SOB for the oxidation of sulfur.This sulfur cycle characteristic may be potential for the stabilization and remediation of lead(Pb)into PbSO4.
non-metal smeltingheavy metalssoil contaminationsulfur-oxidizing bacteriamicrobial community
吴川、陈虹任、陆永平、漆彦婷、李海峰、罗兴华、陈玥如、娄伟、杨卫春、李伟展
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School of Metallurgy and Environment,Central South University,Changsha 410083,China
Department of Science and Environmental Studies,The Education University of Hong Kong,Hong Kong 999007,China
China Railway Seventh Bureau Group Nanjing Engineering Co.,Ltd.,Nanjing 210012,China
NETL
NSTL
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