Porewater constituents inhibit microbially mediated greenhouse gas production (GHG) and regulate the response of soil organic matter decomposition to warming in anoxic peat from a Sphagnum-dominated bog.

Autor:	Song T; School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States., Liu Y; School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States.; Department of Civil & Environmental Engineering, Pennsylvania State University, University Park, University Park, PA 16802, United States., Kolton M; School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States.; French Associates Institute for Agriculture and Biotechnology of Drylands, Ben-Gurion, University of the Negev, Beer Sheva, 8499000, Israel., Wilson RM; Department of Earth, Ocean & Atmospheric Science, Florida State University, Tallahassee, FL 32304, United States., Keller JK; Schmid College of Science and Technology, Chapman University, 1 University Dr, Orange, CA 92866, United States., Rolando JL; School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States., Chanton JP; Department of Earth, Ocean & Atmospheric Science, Florida State University, Tallahassee, FL 32304, United States., Kostka JE; School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States.; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30318, United States.; Center for Microbial Dynamics and Infection, Georgia Institute of Technology, Atlanta, GA 30332, United States.
Jazyk:	angličtina
Zdroj:	FEMS microbiology ecology [FEMS Microbiol Ecol] 2023 Jun 16; Vol. 99 (7).
DOI:	10.1093/femsec/fiad060
Abstrakt:	Northern peatlands store approximately one-third of terrestrial soil carbon. Climate warming is expected to stimulate the microbially mediated degradation of peat soil organic matter (SOM), leading to increasing greenhouse gas (GHG; carbon dioxide, CO2; methane, CH4) production and emission. Porewater dissolved organic matter (DOM) plays a key role in SOM decomposition; however, the mechanisms controlling SOM decomposition and its response to warming remain unclear. The temperature dependence of GHG production and microbial community dynamics were investigated in anoxic peat from a Sphagnum-dominated peatland. In this study, peat decomposition, which was quantified by GHG production and carbon substrate utilization is limited by terminal electron acceptors (TEA) and DOM, and these controls of microbially mediated SOM degradation are temperature-dependent. Elevated temperature led to a slight decrease in microbial diversity, and stimulated the growth of specific methanotrophic and syntrophic taxa. These results confirm that DOM is a major driver of decomposition in peatland soils contains inhibitory compounds, but the inhibitory effect is alleviated by warming. (© The Author(s) 2023. Published by Oxford University Press on behalf of FEMS.)
Databáze:	MEDLINE
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