DOI: 10.1111/gcb.13213
论文题名: Vascular plants promote ancient peatland carbon loss with climate warming
作者: Walker T.N. ; Garnett M.H. ; Ward S.E. ; Oakley S. ; Bardgett R.D. ; Ostle N.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 5 起始页码: 1880
结束页码: 1889
语种: 英语
英文关键词: Climate warming
; Dwarf-shrubs
; Ecosystem respiration
; Graminoids
; Peatlands
; Priming
; Radiocarbon
; Vegetation change
Scopus关键词: carbon sequestration
; climate change
; climate effect
; global warming
; peatland
; Pleistocene
; radiocarbon dating
; soil carbon
; vascular plant
; bryophytes
; Tracheophyta
; carbon dioxide
; carbon cycle
; carbon sequestration
; climate change
; England
; greenhouse effect
; wetland
; Carbon Cycle
; Carbon Dioxide
; Carbon Sequestration
; Climate Change
; England
; Global Warming
; Wetlands
英文摘要: Northern peatlands have accumulated one third of the Earth's soil carbon stock since the last Ice Age. Rapid warming across northern biomes threatens to accelerate rates of peatland ecosystem respiration. Despite compensatory increases in net primary production, greater ecosystem respiration could signal the release of ancient, century- to millennia-old carbon from the peatland organic matter stock. Warming has already been shown to promote ancient peatland carbon release, but, despite the key role of vegetation in carbon dynamics, little is known about how plants influence the source of peatland ecosystem respiration. Here, we address this issue using in situ 14C measurements of ecosystem respiration on an established peatland warming and vegetation manipulation experiment. Results show that warming of approximately 1 °C promotes respiration of ancient peatland carbon (up to 2100 years old) when dwarf-shrubs or graminoids are present, an effect not observed when only bryophytes are present. We demonstrate that warming likely promotes ancient peatland carbon release via its control over organic inputs from vascular plants. Our findings suggest that dwarf-shrubs and graminoids prime microbial decomposition of previously 'locked-up' organic matter from potentially deep in the peat profile, facilitating liberation of ancient carbon as CO2. Furthermore, such plant-induced peat respiration could contribute up to 40% of ecosystem CO2 emissions. If consistent across other subarctic and arctic ecosystems, this represents a considerable fraction of ecosystem respiration that is currently not acknowledged by global carbon cycle models. Ultimately, greater contribution of ancient carbon to ecosystem respiration may signal the loss of a previously stable peatland carbon pool, creating potential feedbacks to future climate change. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61406
Appears in Collections: 影响、适应和脆弱性
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作者单位: Faculty of Life Sciences, The University of Manchester, Michael Smith Building, Oxford Road, Manchester, United Kingdom; Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster, United Kingdom; Centre for Ecology and Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster, United Kingdom; NERC Radiocarbon Facility, Scottish Enterprise Technology Park, Rankine Avenue, East Kilbride, Glasgow, United Kingdom
Recommended Citation:
Walker T.N.,Garnett M.H.,Ward S.E.,et al. Vascular plants promote ancient peatland carbon loss with climate warming[J]. Global Change Biology,2016-01-01,22(5)