title: Interaction effects and mechanism of Pb pollution and soil microorganism in the presence of earthworm.
abstract: Heavy metals usually cause great damage to soil ecosystem. Lead (Pb) was chosen as a research object in the present study. Here repeated exposure of Pb was designed for the soil artificially contaminated. A laboratory study was conducted to determine the changes in the Pb availability and biological activity in the presence of earthworm, and the risk assessment code (RAC) was applied to evaluate the remediated soil. Results demonstrated that Pb gradually transformed to more stable fractions (OMB- and FeMnOX-Pb) under microbial action, indicating the risk level of Pb was declined. On the other hand, Pb also caused the inhibition of soil respiration and microbial biomass, and the higher the concentration of Pb, the stronger the inhibition; While in the presence of earthworm, it could absorb Pb and facilitate microbial activity, reflected the decrease of Pb content and the increase of respiration intensity in soil, as well as microbial biomass. Additionally, a good dose-response relationship between EXCH-Pb content and respiration intensity might provide a basis for ecological risk assessment.
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China.
authors.forename: Gao
authors.initials: G
authors.lastname: Liu
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China.
authors.forename: Siyuan
authors.initials: S
authors.lastname: Ling
authors.affiliation: Shanghai Agricultural Extension and Service Center, Shanghai, 201103, China. Electronic address: zxp19830124@aliyun.com.
authors.forename: Xiuping
authors.initials: X
authors.lastname: Zhan
authors.affiliation: College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
authors.forename: Zhifen
authors.initials: Z
authors.lastname: Lin
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China. Electronic address: wzhang@ecust.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China.
authors.forename: Kuangfei
authors.initials: K
authors.lastname: Lin
mesh_terms: D000818:Animals; D018533:Biomass; D017753:Ecosystem; D004787:Environmental Pollution; D007854:Lead / Q000633:toxicity*; D019216:Metals, Heavy / Q000032:analysis; D009835:Oligochaeta / Q000187:drug effects / Q000502:physiology*; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D019216:Metals, Heavy; D012987:Soil; D012989:Soil Pollutants; D007854:Lead
keywords: Earthworm; Microbial biomass; Pb availability; Repeated exposure; Soil respiration