globalchange  > 气候变化事实与影响
DOI: 10.1002/2013GB004782
Scopus记录号: 2-s2.0-84916939515
论文题名:
Contrasting vulnerability of drained tropical and high-latitude peatlands to fluvial loss of stored carbon
作者: Evans C; D; , Page S; E; , Jones T; , Moore S; , Gauci V; , Laiho R; , Hruška J; , Allott T; E; H; , Billett M; F; , Tipping E; , Freeman C; , Garnett M; H
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期:11
起始页码: 1215
结束页码: 1234
语种: 英语
英文关键词: Dissolved organic carbon ; Drainage ; Peatland ; Radiocarbon
Scopus关键词: atmospheric pollution ; carbon isotope ; carbon sequestration ; dissolved organic carbon ; drainage ; erosivity ; hydraulic conductivity ; land management ; land use change ; peatland ; rewetting ; vulnerability ; Czech Republic ; Finland ; Sphagnum
英文摘要: Carbon sequestration and storage in peatlands rely on consistently highwater tables. Anthropogenic 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 CO2 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 withmarked 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 appearmore resilient to drainage; 14Cmeasurements 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 triggered Sphagnum loss 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. © 2014. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77491
Appears in Collections:气候变化事实与影响

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作者单位: Centre for Ecology and Hydrology, Environment Centre Wales, Bangor, United Kingdom; Department of Geography, University of Leicester, Leicester, United Kingdom; School of Biological Sciences, Bangor University, Bangor, United Kingdom; CEPSAR, Department of Earth and Environmental Sciences, Open University, Milton Keynes, United Kingdom; School of Geography and the Environment, University of Oxford, Oxford, United Kingdom; Finnish Forest Research Institute, Parkano, Finland; Czech Geological Survey, Prague, Czech Republic; Global Change Research Centre, Academy of Sciences of the Czech Republic, Brno, Czech Republic; School of Environment and Development, University of Manchester, Manchester, United Kingdom; Centre for Ecology and Hydrology, Bush Estate, Penicuik, United Kingdom; School Natural Sciences, Institute of Biological and Environmental Sciences, University of Stirling, Stirling, United Kingdom; Centre for Ecology and Hydrology, Lancaster Environment Centre, Lancaster, United Kingdom; NERC Radiocarbon Facility, Scottish Enterprise Technology Park, East Kilbride, United Kingdom

Recommended Citation:
Evans C,D,, Page S,et al. Contrasting vulnerability of drained tropical and high-latitude peatlands to fluvial loss of stored carbon[J]. Global Biogeochemical Cycles,2014-01-01,28(11)
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