A microbial functional group-based module for simulating methane production and consumption: Application to an incubated permafrost soil

Xu, Xiaofeng; Elias, Dwayne A.; Graham, David E.; Phelps, Tommy J.; Carroll, Sue L.; Wullschleger, Stan D.; Thornton, Peter E.

doi:10.1002/2015JG002935

Title: A microbial functional group-based module for simulating methane production and consumption: Application to an incubated permafrost soil

Journal Article · Thu Jul 23 00:00:00 EDT 2015 · Journal of Geophysical Research. Biogeosciences

DOI:https://doi.org/10.1002/2015JG002935· OSTI ID:1201281

Xu, Xiaofeng ^[1]; Elias, Dwayne A. ^[2];

^[2]; Phelps, Tommy J. ^[2]; Carroll, Sue L. ^[2]; Wullschleger, Stan D. ^[2]; Thornton, Peter E. ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Texas at El Paso, El Paso, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In this study, accurately estimating methane (CH₄) flux is critically important for investigating and predicting the biogeochemistry-climate feedback. Better simulating CH₄ flux requires explicit representations of microbial processes on CH₄ dynamics because all processes for CH₄ production and consumption are actually carried out by microbes. A microbial functional group based module was developed and tested against an incubation experiment. The module considers four key mechanisms for CH₄ production and consumption: methanogenesis from acetate or single-carbon compounds and CH₄ oxidation using molecular oxygen or other inorganic electron acceptors. These four processes were carried out by four microbial functional groups: acetoclastic methanogens, hydrogenotrophic methanogens, aerobic methanotrophs, and anaerobic methanotrophs. This module was then linked with the decomposition subroutine of the Community Land Model, and was further used to simulate dynamics of carbon dioxide (CO₂) and CH₄ concentrations from an incubation experiment with permafrost soils. The results show that the model could capture the dynamics of CO₂ and CH₄ concentrations in microcosms with top soils, mineral layer soils and permafrost soils under natural and saturated moisture conditions and a temperature gradient of -2°C, 3°C, and 5°C. Sensitivity analysis confirmed the importance of acetic acid's direct contribution as substrate and indirect effects through pH feedback on CO₂ and CH₄ production and consumption. This study suggests that representing the microbial mechanisms is critical for modeling CH₄ production and consumption; it is urgent to incorporate microbial mechanisms into Earth system models for better predicting the behavior of the climate system.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1201281

Journal Information:: Journal of Geophysical Research. Biogeosciences, Vol. 120, Issue 7; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 45 works

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