Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/22377
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Contrasting vulnerability of drained tropical and high-latitude peatlands to fluvial loss of stored carbon
Authors: Evans, Christopher D
Page, Susan E
Jones, Tim
Moore, Sam
Gauci, Vincent
Laiho, Raija
Hruska, Jakub
Allott, Tim E H
Billett, Michael
Tipping, Edward
Freeman, Chris
Garnett, Mark H
Contact Email: m.f.billett@stir.ac.uk
Keywords: peatland
drainage
dissolved organic carbon
radiocarbon
Issue Date: Nov-2014
Publisher: Wiley-Blackwell
Citation: Evans CD, Page SE, Jones T, Moore S, Gauci V, Laiho R, Hruska J, Allott TEH, Billett M, Tipping E, Freeman C & Garnett MH (2014) Contrasting vulnerability of drained tropical and high-latitude peatlands to fluvial loss of stored carbon, Global Biogeochemical Cycles, 28 (11), pp. 1215-1234.
Abstract: Carbon sequestration and storage in peatlands rely on consistently high water tables. Anthropogenic pressures including drainage, burning, land conversion for agriculture, timber, and biofuel production, cause loss of pressures including drainage, burning, land conversion for agriculture, timber, and biofuel production, cause loss of peat-forming vegetation and exposure of previously anaerobic peat to aerobic decomposition. This can shift peatlands from net CO 2 sinks to large CO2 sources, releasing carbon held for millennia. Peatlands also export significant quantities of carbon via fluvial pathways, mainly as dissolved organic carbon (DOC). We analyzed radiocarbon (14C) levels of DOC in drainage water from multiple peatlands in Europe and Southeast Asia, to infer differences in the age of carbon lost from intact and drained systems. In most cases, drainage led to increased release of older carbon from the peat profile but with marked differences related to peat type. Very low DOC-14C levels in runoff from drained tropical peatlands indicate loss of very old (centuries to millennia) stored peat carbon. High-latitude peatlands appear more resilient to drainage;14C measurements from UK blanket bogs suggest that exported DOC remains young (<50 years) despite drainage. Boreal and temperate fens and raised bogs in Finland and the Czech Republic showed intermediate sensitivity. We attribute observed differences to physical and climatic differences between peatlands, in particular, hydraulic conductivity and temperature, as well as the extent of disturbance associated with drainage, notably land use changes in the tropics. Data from the UK Peak District, an area where air pollution and intensive land management have triggeredSphagnumloss and peat erosion, suggest that additional anthropogenic pressures may trigger fluvial loss of much older (>500 year) carbon in high-latitude systems. Rewetting at least partially offsets drainage effects on DOC age.
Type: Journal Article
URI: http://hdl.handle.net/1893/22377
DOI Link: http://dx.doi.org/10.1002/2013GB004782
Rights: This article is open-access. Open access publishing allows free access to and distribution of published articles where the author retains copyright of their work by employing a Creative Commons attribution licence. Proper attribution of authorship and correct citation details should be given.
Affiliation: Centre for Ecology & Hydrology (CEH)
University of Leicester
Bangor University
University of Oxford
The Open University
Finnish Forest Research Institute
Czech Academy of Sciences
University of Manchester
Biological and Environmental Sciences
Centre for Ecology & Hydrology (CEH)
University of Wales, Bangor
NERC Radiocarbon Facility (Environment)

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