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Root oxygen mitigates methane fluxes in tropical peatlands

Research output: Contribution to journalJournal article

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  • N.T. Girkin
  • C.H. Vane
  • B.L. Turner
  • N.J. Ostle
  • S. Sjögersten
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Article number064013
<mark>Journal publication date</mark>27/05/2020
<mark>Journal</mark>Environmental Research Letters
Issue number6
Volume15
Number of pages11
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Tropical peatlands are a globally important source of methane, a potent greenhouse gas. Vegetation is critical in regulating fluxes, providing a conduit for emissions and regular carbon inputs. However, plant roots also release oxygen, which might mitigate methane efflux through oxidation prior to emission from the peat surface. Here we show, using in situ mesocosms, that root exclusion can reduce methane fluxes by a maximum of 92% depending on species, likely driven by the significant decrease in root inputs of oxygen and changes in the balance of methane transport pathways. Methanotroph abundance decreased with reduced oxygen input, demonstrating a likely mechanism for the observed response. These first methane oxidation estimates for a tropical peatland demonstrate that although plants provide an important pathway for methane loss, this can be balanced by the influence of root oxygen inputs that mitigate peat surface methane emissions.