A microbial functional group-based module for simulating methane production and consumption: Application to an incubated permafrost soil
| Autor: | Tommy J. Phelps, Sue L Carroll, Peter E. Thornton, David E. Graham, Xiaofeng Xu, Stan D. Wullschleger, Dwayne A. Elias |
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| Rok vydání: | 2015 |
| Předmět: |
Atmospheric Science
Topsoil Ecology Methanotroph biology Methanogenesis Paleontology Soil Science Forestry Soil science Aquatic Science Permafrost biology.organism_classification Methanogen Methane chemistry.chemical_compound chemistry Soil water Environmental science Microcosm Water Science and Technology |
| Zdroj: | Journal of Geophysical Research: Biogeosciences. 120:1315-1333 |
| ISSN: | 2169-8953 |
| Popis: | Accurately estimating methane (CH4) flux in terrestrial ecosystems is critically important for investigating and predicting biogeochemistry-climate feedbacks. Improved simulations of CH4 flux require explicit representations of the microbial processes that account for CH4 dynamics. A microbial functional group-based module was developed, building on the decomposition subroutine of the Community Land Model 4.5. This module considers four key mechanisms for CH4 production and consumption: methanogenesis from acetate or from single-carbon compounds and CH4 oxidation using molecular oxygen or other inorganic electron acceptors. Four microbial functional groups perform these processes: acetoclastic methanogens, hydrogenotrophic methanogens, aerobic methanotrophs, and anaerobic methanotrophs. This module was used to simulate dynamics of carbon dioxide (CO2) and CH4 concentrations from an incubation experiment with permafrost soils. The results show that the model captures 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 three temperature conditions of −2°C, 3°C, and 5°C (R2 > 0.67; P |
| Databáze: | OpenAIRE |
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