Disproportionate CH4 Sink Strength from an Endemic, Sub-Alpine Australian Soil Microbial Community

McDaniel, Marshall D., Hernández, Marcela, Dumont, Marc G., Ingram, Lachlan J. and Adams, Mark A. (2021) Disproportionate CH4 Sink Strength from an Endemic, Sub-Alpine Australian Soil Microbial Community. Microorganisms, 9 (3). ISSN 2076-2607

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Abstract

Soil-to-atmosphere methane (CH4) fluxes are dependent on opposing microbial processes of production and consumption. Here we use a soil–vegetation gradient in an Australian sub-alpine ecosystem to examine links between composition of soil microbial communities, and the fluxes of greenhouse gases they regulate. For each soil/vegetation type (forest, grassland, and bog), we meas-ured carbon dioxide (CO2) and CH4 fluxes and their production/consumption at 5 cm intervals to a depth of 30 cm. All soils were sources of CO2, ranging from 49 to 93 mg CO2 m −2 h −1. Forest soils were strong net sinks for CH4, at rates of up to −413 µg CH4 m −2 h −1. Grassland soils varied, with some soils acting as sources and some as sinks, but overall averaged −97 µg CH4 m −2 h −1. Bog soils were net sources of CH4 (+340 µg CH4 m −2 h −1). Methanotrophs were dominated by USCα in forest and grassland soils, and Candidatus Methylomirabilis in the bog soils. Methylocystis were also de-tected at relatively low abundance in all soils. Our study suggests that there is a disproportionately large contribution of these ecosystems to the global soil CH4 sink, which highlights our dependence on soil ecosystem services in remote locations driven by unique populations of soil microbes. It is paramount to explore and understand these remote, hard-to-reach ecosystems to better understand biogeochemical cycles that underpin global sustainability.

Item Type: Article
Uncontrolled Keywords: 16s rrna,carbon dioxide,methane,methanogen,methanotroph,methylomirabilis,pmoa,usc-alpha,uscα,microbiology,virology,microbiology (medical) ,/dk/atira/pure/subjectarea/asjc/2400/2404
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 27 Mar 2021 00:50
Last Modified: 22 Apr 2021 23:48
URI: https://ueaeprints.uea.ac.uk/id/eprint/79571
DOI: 10.3390/microorganisms9030606

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