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Interactions between labile carbon, temperature and land use regulate carbon dioxide and methane production in tropical peat

Girkin, NT, Dhandapani, S, Evers, SL, Ostle, N, Turner, BL and Sjögersten, S (2019) Interactions between labile carbon, temperature and land use regulate carbon dioxide and methane production in tropical peat. Biogeochemistry, 147 (1). pp. 87-97. ISSN 0168-2563

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Abstract

Tropical peatlands are a significant carbon store and contribute to global carbon dioxide (CO2) and methane (CH4) emissions. Tropical peatlands are threatened by both land use and climate change, including the alteration of regional precipitation patterns, and the 3–4 °C predicted warming by 2100. Plant communities in tropical peatlands can regulate greenhouse gas (GHG) fluxes through labile carbon inputs, but the extent to which these inputs regulate the temperature response of CO2 and CH4 production in tropical peat remains unclear. We conducted an anoxic incubation experiment using three peat types of contrasting botanical origin to assess how carbon addition affects the temperature response (Q10) of CO2 and CH4 production. Peats from forested peatlands in Panama and Malaysia, and a converted oil palm and pineapple intercropping system in Malaysia, differed significantly in redox potential, total carbon and carbon: nitrogen ratio. The production of CO2 and CH4 varied significantly among peat types and increased with increasing temperature, with Q10s for both gases of 1.4. Carbon addition further increased gas fluxes, but did not influence the Q10 for CO2 or CH4 production or significantly affect the Q10 of either gas. These findings demonstrate that the production of CO2 and CH4 in tropical peat is sensitive to warming and varies among peat types, but that the effect of root inputs in altering Q10 appears to be limited. © 2019, The Author(s).

Item Type: Article
Uncontrolled Keywords: 0399 Other Chemical Sciences, 0402 Geochemistry, 0502 Environmental Science and Management
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QD Chemistry
Divisions: Biological & Environmental Sciences (new Sep 19)
Publisher: Springer Verlag (Germany)
Date Deposited: 18 Feb 2020 10:12
Last Modified: 18 Feb 2020 10:15
DOI or Identification number: 10.1007/s10533-019-00632-y
URI: http://researchonline.ljmu.ac.uk/id/eprint/12266

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