1
|
Song T, Liu Y, Kolton M, Wilson RM, Keller JK, Rolando JL, Chanton JP, Kostka JE. 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. FEMS Microbiol Ecol 2023; 99:fiad060. [PMID: 37280172 DOI: 10.1093/femsec/fiad060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 05/16/2023] [Accepted: 06/05/2023] [Indexed: 06/08/2023] Open
Abstract
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.
Collapse
Affiliation(s)
- Tianze Song
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States
| | - Yutong Liu
- 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
| | - Max Kolton
- 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
| | - Rachel M Wilson
- Department of Earth, Ocean & Atmospheric Science, Florida State University, Tallahassee, FL 32304, United States
| | - Jason K Keller
- Schmid College of Science and Technology, Chapman University, 1 University Dr, Orange, CA 92866, United States
| | - Jose L Rolando
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States
| | - Jeffrey P Chanton
- Department of Earth, Ocean & Atmospheric Science, Florida State University, Tallahassee, FL 32304, United States
| | - Joel E Kostka
- 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
| |
Collapse
|