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Pyrite oxidization accelerates bacterial carbon sequestration in copper mine tailings

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doi: 10.5194/bg-16-573-2019
Authors:Li Yang; Wu Zhaojun; Dong Xingchen; Xu Zifu; Zhang Qixin; Su Haiyan; Jia Zhongjun; Sun Qingye
Author Affiliations:Primary:
Anhui University, School of Resources and Environmental Engineering, Hefei, China
Chinese Academy of Sciences, State Key Laboratory of Soil and Sustainable Agriculture, China
Gansu Agricultural University, China
Volume Title:Biogeosciences
Source:Biogeosciences, 16(2), p.573-583. Publisher: Copernicus GmbH on behalf of the European Union, Katlenburg-Lindau, International. ISSN: 1726-4170
Publication Date:2019
Note:In English. 41 refs.; illus.
Summary:Polymetallic mine tailings have great potential as carbon sequestration tools to stabilize atmospheric CO2 concentrations. However, previous studies focused on carbonate mineral precipitation, whereas the role of autotrophic bacteria in mine tailing carbon sequestration has been neglected. In this study, carbon sequestration in two samples of mine tailings treated with FeS2 was evaluated using 13C isotope, pyrosequencing and DNA-based stable isotope probing (SIP) analyses to identify carbon fixers. Mine tailings treated with FeS2 exhibited a higher percentage of 13C atoms (1.76±0.06% for Yangshanchong and 1.36±0.01% for Shuimuchong) than did controls over a 14-day incubation, which emphasized the role of autotrophs in carbon sequestration with pyrite addition. Pyrite treatment also led to changes in the composition of bacterial communities, and several autotrophic bacteria increased, including Acidithiobacillus and Sulfobacillus. Furthermore, pyrite addition increased the relative abundance of the dominant genus Sulfobacillus by 8.86% and 5.99% in Yangshanchong and Shuimuchong samples, respectively. Furthermore, DNA SIP results indicated a 8.20-16.50 times greater gene copy number for cbbL than cbbM in 13C-labeled heavy fractions, and a Sulfobacillus-like cbbL gene sequence (cbbL-OTU1) accounted for 30.11%-34.74% of all cbbL gene sequences in 13C-labeled heavy fractions of mine tailings treated with FeS2. These findings highlight the importance of the cbbL gene in bacterial carbon sequestration and demonstrate the ability of chemoautotrophs to sequester carbon during sulfide mineral oxidation in mine tailings. This study is the first to investigate carbon sequestration by autotrophic bacteria in mine tailings through the use of isotope tracers and DNA SIP.
Subjects:Acidithiobacillus; Bacillus; C-13; Carbon; Carbon dioxide; Carbon sequestration; Carbonates; Communities; Concentration; Data processing; DNA; Ecosystems; Environmental analysis; Genes; Genetics; Iron sulfides; Isotopes; Mine waste; Nucleic acids; Oxidation; Pyrite; RNA; Soils; Stable isotopes; Sulfides; Tailings; Tracers; Anhui China; Asia; China; Far East; Bacteria; Sulfobacillus
Coordinates:N305400 N305400 E1175300 E1175300
N305500 N305500 E1175000 E1175000
Record ID:848751-23
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany
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