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CS2 increasing CH4-derived carbon emissions and active microbial diversity in lake sediments
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Wang, Jing, Chu, Yi-Xuan, Schäfer, Hendrik, Tian, Guangming and He, Ruo (2022) CS2 increasing CH4-derived carbon emissions and active microbial diversity in lake sediments. Environmental Research, 208 . 112678. doi:10.1016/j.envres.2022.112678 ISSN 0013-9351.
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Official URL: http://dx.doi.org/10.1016/j.envres.2022.112678
Abstract
Lakes are important methane (CH4) sources to the atmosphere, especially eutrophic lakes with cyanobacterial blooms accompanied by volatile sulfur compound (VSC) emissions. CH4 oxidation is a key strategy to mitigate CH4 emission from lakes. In this study, we characterized the fate of CH4-derived carbon and active microbial communities in lake sediments with CS2 used as a typical VSC, based on the investigation of CH4 and VSC fluxes from Meiliang Bay in Lake Taihu. Stable isotope probing microcosm incubation showed that the efficiency of CH4-derived carbon incorporated into organic matter was 21.1% in the sediment with CS2 existence, which was lower than that without CS2 (27.3%). SO42--S was the main product of CS2 oxidation under aerobic condition, accounting for 59.3–62.7% of the input CS2–S. CS2 and CH4 coexistence led to a decrease of methanotroph and methylotroph abundances and stimulated the production of extracellular polymeric substances. CS2 and its metabolites including total sulfur, SO42− and acid volatile sulfur acted as the main drivers influencing the active microbial community structure in the sediments. Compared with α-proteobacteria methanotrophs, γ-proteobacteria methanotrophs Methylomicrobium, Methylomonas, Crenothrix and Methylosarcina were more dominant in the sediments. CH4-derived carbon mainly flowed into methylotrophs in the first stage. With CH4 consumption, more CH4-derived carbon flowed into non-methylotrophs. CS2 could prompt more CH4-derived carbon flowing into non-methanotrophs and non-methylotrophs, such as sulfur-metabolizing bacteria. These findings can help elucidate the influence of VSCs on microorganisms and provide insights to carbon fluxes from eutrophic lake systems.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||||
Journal or Publication Title: | Environmental Research | ||||||||
Publisher: | Elsevier | ||||||||
ISSN: | 0013-9351 | ||||||||
Official Date: | 15 May 2022 | ||||||||
Dates: |
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Volume: | 208 | ||||||||
Article Number: | 112678 | ||||||||
DOI: | 10.1016/j.envres.2022.112678 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 4 February 2022 | ||||||||
Date of first compliant Open Access: | 4 February 2022 |
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