Warming promotes the use of organic matter as an electron acceptor in a peatland
Abstract
Peatlands store approximately one-half of terrestrial soil organic carbon (C) and the future of this C in the face of ongoing global change remains a key question in global biogeochemistry. Particularly pressing is the need to understand if this C will remain in peatland soils or be returned to the atmosphere as the potent greenhouse gas methane (CH4) in response to warming. Past work has demonstrated that the microbial reduction of organic matter (OM) as an alternative terminal electron acceptor (TEA) under anaerobic conditions can suppress CH4 production and is a key mechanistic control of peatland CH4 dynamics. Here we show that warming directly enhances rates of potential OM reduction in peatland soils, enhancing acetate availability and allowing for a faster onset of CH4 production. Finally, using soils collected from the ecosystem-scale Spruce and Peatland Responses Under Changing Environments (SPRUCE) experiment, we also show that while there were no indirect effects of 2 years of soil warming on potential OM reduction through changes in soil quality, warming-mediated lowering of the water table increased the volume of oxidized OM which will suppress CH4 production following rewetting events.
- Authors:
-
- Chapman Univ., Orange, CA (United States); Univ. of Colorado, Boulder, CO (United States)
- Chapman Univ., Orange, CA (United States)
- Univ. of Oregon, Eugene, OR (United States)
- Publication Date:
- Research Org.:
- Chapman Univ., Orange, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1977160
- Alternate Identifier(s):
- OSTI ID: 1798945
- Grant/Contract Number:
- SC0014416; SC00008092
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geoderma
- Additional Journal Information:
- Journal Volume: 401; Journal Issue: C; Journal ID: ISSN 0016-7061
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Agriculture; Anaerobic respiration; Methane; Organic matter reduction; Peatlands
Citation Formats
Rush, Jessica E., Zalman, Cassandra A., Woerndle, Glenn, Hanna, Emily L., Bridgham, Scott D., and Keller, Jason K. Warming promotes the use of organic matter as an electron acceptor in a peatland. United States: N. p., 2021.
Web. doi:10.1016/j.geoderma.2021.115303.
Rush, Jessica E., Zalman, Cassandra A., Woerndle, Glenn, Hanna, Emily L., Bridgham, Scott D., & Keller, Jason K. Warming promotes the use of organic matter as an electron acceptor in a peatland. United States. https://doi.org/10.1016/j.geoderma.2021.115303
Rush, Jessica E., Zalman, Cassandra A., Woerndle, Glenn, Hanna, Emily L., Bridgham, Scott D., and Keller, Jason K. Mon .
"Warming promotes the use of organic matter as an electron acceptor in a peatland". United States. https://doi.org/10.1016/j.geoderma.2021.115303. https://www.osti.gov/servlets/purl/1977160.
@article{osti_1977160,
title = {Warming promotes the use of organic matter as an electron acceptor in a peatland},
author = {Rush, Jessica E. and Zalman, Cassandra A. and Woerndle, Glenn and Hanna, Emily L. and Bridgham, Scott D. and Keller, Jason K.},
abstractNote = {Peatlands store approximately one-half of terrestrial soil organic carbon (C) and the future of this C in the face of ongoing global change remains a key question in global biogeochemistry. Particularly pressing is the need to understand if this C will remain in peatland soils or be returned to the atmosphere as the potent greenhouse gas methane (CH4) in response to warming. Past work has demonstrated that the microbial reduction of organic matter (OM) as an alternative terminal electron acceptor (TEA) under anaerobic conditions can suppress CH4 production and is a key mechanistic control of peatland CH4 dynamics. Here we show that warming directly enhances rates of potential OM reduction in peatland soils, enhancing acetate availability and allowing for a faster onset of CH4 production. Finally, using soils collected from the ecosystem-scale Spruce and Peatland Responses Under Changing Environments (SPRUCE) experiment, we also show that while there were no indirect effects of 2 years of soil warming on potential OM reduction through changes in soil quality, warming-mediated lowering of the water table increased the volume of oxidized OM which will suppress CH4 production following rewetting events.},
doi = {10.1016/j.geoderma.2021.115303},
journal = {Geoderma},
number = C,
volume = 401,
place = {United States},
year = {Mon Jun 28 00:00:00 EDT 2021},
month = {Mon Jun 28 00:00:00 EDT 2021}
}
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