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Anaerobic methane oxidation is quantitatively important in deeper peat layers of boreal peatlands: Evidence from anaerobic incubations, in situ stable isotopes depth profiles, and microbial communities.
Sabrekov, Aleksandr F; Semenov, Mikhail V; Terentieva, Irina E; Krasnov, George S; Kharitonov, Sergey L; Glagolev, Mikhail V; Litti, Yuriy V.
Afiliación
  • Sabrekov AF; UNESCO Department "Environmental Dynamics and Global Climate Changes", Ugra State University, Khanty-Mansiysk, Russia. Electronic address: sabrekovaf@gmail.com.
  • Semenov MV; Laboratory of Soil Carbon and Microbial Ecology, Dokuchaev Soil Science Institute, Moscow, Russia.
  • Terentieva IE; Faculty of Arts, University of Calgary, Calgary, Canada.
  • Krasnov GS; Laboratory of Postgenomic Research, Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia.
  • Kharitonov SL; Faculty of Soil Science, Lomonosov Moscow State University, Moscow, Russia.
  • Glagolev MV; UNESCO Department "Environmental Dynamics and Global Climate Changes", Ugra State University, Khanty-Mansiysk, Russia; Faculty of Soil Science, Lomonosov Moscow State University, Moscow, Russia.
  • Litti YV; Winogradsky Institute of Microbiology, Research Center of Biotechnology of the Russian Academy of Sciences, Moscow, Russia.
Sci Total Environ ; 916: 170213, 2024 Mar 15.
Article en En | MEDLINE | ID: mdl-38278226
ABSTRACT
Boreal peatlands store most of their carbon in layers deeper than 0.5 m under anaerobic conditions, where carbon dioxide and methane are produced as terminal products of organic matter degradation. Since the global warming potential of methane is much greater than that of carbon dioxide, the balance between the production rates of these gases is important for future climate predictions. Herein, we aimed to understand whether anaerobic methane oxidation (AMO) could explain the high CO2/CH4 anaerobic production ratios that are widely observed for the deeper peat layers of boreal peatlands. Furthermore, we quantified the metabolic pathways of methanogenesis to examine whether hydrogenotrophic methanogenesis is a dominant methane production pathway for the presumably recalcitrant deeper peat. To assess the CH4 cycling in deeper peat, we combined laboratory anaerobic incubations with a pathway-specific inhibitor, in situ depth patterns of stable isotopes in CH4, and 16S rRNA gene amplicon sequencing for three representative boreal peatlands in Western Siberia. We found up to a 69 % reduction in CH4 production due to AMO, which largely explained the high CO2/CH4 anaerobic production ratios and the in situ depth-related patterns of δ13C and δD in methane. The absence of acetate accumulation after inhibiting acetotrophic methanogenesis and the presence of sulfate- and nitrate-reducing anaerobic acetate oxidizers in the deeper peat indicated that these microorganisms use SO42- and NO3- as electron acceptors. Acetotrophic methanogenesis dominated net CH4 production in the deeper peat, accounting for 81 ± 13 %. Overall, anaerobic oxidation is quantitatively important for the methane cycle in the deeper layers of boreal peatlands, affecting both methane and its main precursor concentrations.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Dióxido de Carbono / Microbiota Idioma: En Revista: Sci Total Environ Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Dióxido de Carbono / Microbiota Idioma: En Revista: Sci Total Environ Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos