Regulators of aerobic and anaerobic methane oxidation in two pristine temperate peatland types.

Autor:	Nweze JA; Institute of Soil Biology and Biogeochemistry, Biology Centre CAS, Branišovská 31, 370 05 České Budějovice, Czech Republic.; Department of Ecosystem Biology, Faculty of Science, University of South Bohemia, Branišovská 31a, 370 05 České Budějovice, Czech Republic.; Department of Science Laboratory Technology, Faculty of Physical Sciences, University of Nigeria, Owerre Eze Rd, Ihe Nsukka, Nsukka 410105, Enugu, Nigeria., Tláskal V; Institute of Soil Biology and Biogeochemistry, Biology Centre CAS, Branišovská 31, 370 05 České Budějovice, Czech Republic., Wutkowska M; Institute of Soil Biology and Biogeochemistry, Biology Centre CAS, Branišovská 31, 370 05 České Budějovice, Czech Republic., Meador TB; Institute of Soil Biology and Biogeochemistry, Biology Centre CAS, Branišovská 31, 370 05 České Budějovice, Czech Republic.; Department of Ecosystem Biology, Faculty of Science, University of South Bohemia, Branišovská 31a, 370 05 České Budějovice, Czech Republic., Picek T; Department of Ecosystem Biology, Faculty of Science, University of South Bohemia, Branišovská 31a, 370 05 České Budějovice, Czech Republic., Urbanová Z; Department of Ecosystem Biology, Faculty of Science, University of South Bohemia, Branišovská 31a, 370 05 České Budějovice, Czech Republic., Daebeler A; Institute of Soil Biology and Biogeochemistry, Biology Centre CAS, Branišovská 31, 370 05 České Budějovice, Czech Republic.
Jazyk:	angličtina
Zdroj:	FEMS microbiology ecology [FEMS Microbiol Ecol] 2024 Nov 23; Vol. 100 (12).
DOI:	10.1093/femsec/fiae153
Abstrakt:	Despite covering <5% of Earth's terrestrial area, peatlands are crucial for global carbon storage and are hot spots of methane cycling. This study examined the dynamics of aerobic and anaerobic methane oxidation in two undisturbed peatlands: a fen and a spruce swamp forest. Using microcosm incubations, we investigated the effect of ammonium addition, at a level similar to current N pollution processes, on aerobic methane oxidation. Our findings revealed higher methane consumption rates in fen compared to swamp peat, but no effect of ammonium amendment on methane consumption was found. Members of Methylocystis and Methylocella were the predominant methanotrophs in both peatlands. Furthermore, we explored the role of ferric iron and sulfate as electron acceptors for the anaerobic oxidation of methane (AOM). AOM occurred without the addition of an external electron acceptor in the fen, but not in the swamp peat. AOM was stimulated by sulfate and ferric iron addition in the swamp peat and inhibited by ferric iron in the fen. Our findings suggest that aerobic methane oxidizers are not N-limited in these peatlands and that there is an intrinsic potential for AOM in these environments, partially facilitated by ferric iron and sulfate acting as electron acceptors. (© The Author(s) 2024. Published by Oxford University Press on behalf of FEMS.)
Databáze:	MEDLINE
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