An Integrative Model for Soil Biogeochemistry and Methane Processes. II: Warming and Elevated CO2 Effects on Peatland CH4 Emissions
Abstract
Abstract Peatlands are one of the largest natural sources for atmospheric methane (CH 4 ), a potent greenhouse gas. Climate warming and elevated atmospheric carbon dioxide (CO 2 ) are two important environmental factors that have been confirmed to stimulate peatland CH 4 emissions; however, the mechanisms underlying enhanced emissions remain elusive. A data‐model integration approach was applied to understand the CH 4 processes in a northern temperate peatland under a gradient of warming and doubled atmospheric CO 2 concentration. We found that warming and elevated CO 2 stimulated CH 4 emissions through different mechanisms. Warming initially stimulated but then suppressed vegetative productivity while stimulating soil organic matter (SOM) mineralization and dissolved organic carbon (DOC) fermentation, which led to higher acetate production and enhanced acetoclastic and hydrogenotrophic methanogenesis. Warming also enhanced surface CH 4 emissions, which combined with warming‐caused decreases in CH 4 solubility led to slightly lower dissolved CH 4 concentrations through the soil profiles. Elevated CO 2 enhanced ecosystem productivity and SOM mineralization, resulting in higher DOC and acetate concentrations. Higher DOC and acetate concentrations increased acetoclastic and hydrogenotrophic methanogenesis and led to higher dissolved CH 4 concentrations and CH 4 emissions. Both warming and elevated CO 2more »
- Authors:
-
- San Diego State Univ., CA (United States); Chinese Academy of Sciences (CAS), Shenyang (China)
- San Diego State Univ., CA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Oregon, Eugene, OR (United States)
- Chapman Univ., Orange, CA (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1831634
- Alternate Identifier(s):
- OSTI ID: 1812810
- Grant/Contract Number:
- AC05-00OR22725; AC05-100800OR22725; SC0014416; SC0008092; DE‐SC0008092; DE‐SC0014416
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Biogeosciences
- Additional Journal Information:
- Journal Volume: 126; Journal Issue: 8; Journal ID: ISSN 2169-8953
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; methane; elevated carbon dioxide; model; peatland; warming
Citation Formats
Yuan, Fenghui, Wang, Yihui, Ricciuto, Daniel M., Shi, Xiaoying, Yuan, Fengming, Hanson, Paul J., Bridgham, Scott, Keller, Jason K., Thornton, Peter E., and Xu, Xiaofeng. An Integrative Model for Soil Biogeochemistry and Methane Processes. II: Warming and Elevated CO2 Effects on Peatland CH4 Emissions. United States: N. p., 2021.
Web. doi:10.1029/2020jg005963.
Yuan, Fenghui, Wang, Yihui, Ricciuto, Daniel M., Shi, Xiaoying, Yuan, Fengming, Hanson, Paul J., Bridgham, Scott, Keller, Jason K., Thornton, Peter E., & Xu, Xiaofeng. An Integrative Model for Soil Biogeochemistry and Methane Processes. II: Warming and Elevated CO2 Effects on Peatland CH4 Emissions. United States. https://doi.org/10.1029/2020jg005963
Yuan, Fenghui, Wang, Yihui, Ricciuto, Daniel M., Shi, Xiaoying, Yuan, Fengming, Hanson, Paul J., Bridgham, Scott, Keller, Jason K., Thornton, Peter E., and Xu, Xiaofeng. Fri .
"An Integrative Model for Soil Biogeochemistry and Methane Processes. II: Warming and Elevated CO2 Effects on Peatland CH4 Emissions". United States. https://doi.org/10.1029/2020jg005963. https://www.osti.gov/servlets/purl/1831634.
@article{osti_1831634,
title = {An Integrative Model for Soil Biogeochemistry and Methane Processes. II: Warming and Elevated CO2 Effects on Peatland CH4 Emissions},
author = {Yuan, Fenghui and Wang, Yihui and Ricciuto, Daniel M. and Shi, Xiaoying and Yuan, Fengming and Hanson, Paul J. and Bridgham, Scott and Keller, Jason K. and Thornton, Peter E. and Xu, Xiaofeng},
abstractNote = {Abstract Peatlands are one of the largest natural sources for atmospheric methane (CH 4 ), a potent greenhouse gas. Climate warming and elevated atmospheric carbon dioxide (CO 2 ) are two important environmental factors that have been confirmed to stimulate peatland CH 4 emissions; however, the mechanisms underlying enhanced emissions remain elusive. A data‐model integration approach was applied to understand the CH 4 processes in a northern temperate peatland under a gradient of warming and doubled atmospheric CO 2 concentration. We found that warming and elevated CO 2 stimulated CH 4 emissions through different mechanisms. Warming initially stimulated but then suppressed vegetative productivity while stimulating soil organic matter (SOM) mineralization and dissolved organic carbon (DOC) fermentation, which led to higher acetate production and enhanced acetoclastic and hydrogenotrophic methanogenesis. Warming also enhanced surface CH 4 emissions, which combined with warming‐caused decreases in CH 4 solubility led to slightly lower dissolved CH 4 concentrations through the soil profiles. Elevated CO 2 enhanced ecosystem productivity and SOM mineralization, resulting in higher DOC and acetate concentrations. Higher DOC and acetate concentrations increased acetoclastic and hydrogenotrophic methanogenesis and led to higher dissolved CH 4 concentrations and CH 4 emissions. Both warming and elevated CO 2 had minor impacts on CH 4 oxidation. A meta‐analysis of warming and elevated CO 2 impacts on carbon cycling in wetlands agreed well with a majority of the modeled mechanisms. This mechanistic understanding of the stimulating impacts of warming and elevated CO 2 on peatland CH 4 emissions enhances our predictability on the climate‐ecosystem feedback.},
doi = {10.1029/2020jg005963},
journal = {Journal of Geophysical Research. Biogeosciences},
number = 8,
volume = 126,
place = {United States},
year = {Fri Jul 09 00:00:00 EDT 2021},
month = {Fri Jul 09 00:00:00 EDT 2021}
}
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