Skip to main content
Article thumbnail
Location of Repository

Abiotic drivers and their interactive effect on the flux and carbon isotope (14C and d13C) composition of peat-respired CO2

By S.M.L. Hardie, M.H. Garnett, A.E. Fallick, A.P. Rowland, N.J. Ostle and T.H. Flowers

Abstract

Feedbacks to global warming may cause terrestrial ecosystems to add to anthropogenic CO2 emissions,\ud thus exacerbating climate change. The contribution that soil respiration makes to these terrestrial\ud emissions, particularly from carbon-rich soils such as peatlands, is of significant importance and its\ud response to changing climatic conditions is of considerable debate.We collected intact soil cores from an\ud upland blanket bog situated within the northern Pennines, England, UK and investigated the individual\ud and interactive effects of three primary controls on soil organic matter decomposition: (i) temperature\ud (5, 10 and 15 C); (ii) moisture (50 and 100% field capacity e FC); and (iii) substrate quality, using\ud increasing depth from the surface (0e10, 10e20 and 20e30 cm) as an analogue for increased recalcitrance\ud of soil organic material. Statistical analysis of the results showed that temperature, moisture and\ud substrate quality all significantly affected rates of peat decomposition. Q10 values indicated that the\ud temperature sensitivity of older/more recalcitrant soil organic matter significantly increased (relative to\ud more labile peat) under reduced soil moisture (50% FC) conditions, but not under 100% FC, suggesting\ud that soil microorganisms decomposing the more recalcitrant soil material preferred more aerated\ud conditions. Radiocarbon analyses revealed that soil decomposers were able to respire older, more\ud recalcitrant soil organic matter and that the source of the material (deduced from the d13C analyses)\ud subject to decomposition, changed depending on depth in the peat profile

Topics: Agriculture and Soil Science, Ecology and Environment
Year: 2011
DOI identifier: 10.1016/j.soilbio.2011.08.010
OAI identifier: oai:nora.nerc.ac.uk:15212
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://www.sciencedirect.com/s... (external link)
  • https://doi.org/10.1016/j.soil... (external link)
  • https://doi.org/10.1016/j.soil... (external link)
  • http://nora.nerc.ac.uk/id/epri... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.