DOI: 10.1002/2014GB005000
Scopus记录号: 2-s2.0-85027947575
论文题名: The stoichiometry of carbon and nutrients in peat formation
作者: Wang M ; , Moore T ; R ; , Talbot J ; , Riley J ; L
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 2 起始页码: 113
结束页码: 121
语种: 英语
英文关键词: bog
; fen
; mire
; nitrogen
; phosphorus
; swamp
Scopus关键词: concentration (composition)
; decomposition
; land type
; litter
; nutrient cycling
; peatland
; soil chemistry
; surface layer
; Canada
; Ontario [Canada]
英文摘要: Northern peatlands have stored large amounts (∼500 Pg) of carbon (C) since the last glaciation. Combined with peat C are nutrients such as nitrogen (N), phosphorus (P), calcium (Ca), magnesium (Mg), and potassium (K), each of which plays an important role in plant production, litter decomposition, and the biogeochemical functioning of peatlands. Yet little attention has been given to the amounts of these nutrients stored in northern peatlands and their stoichiometry with C. Here we use data on nutrient concentrations in over 400 peat profiles in Ontario, Canada, representing bogs, fens, and swamps and their vegetation. We show that the C:N ratio is high (>40:1) in vegetation and litter but declines through the peat profiles to reach ratios between 22:1 and 29:1 in peat below 50 cm. In contrast, the C:P ratio rises from vegetation and litter (500:1 to 1300:1) to 1500:1 to 2000:1 in the lower part of the peat profile. Ratios of C to Ca, Mg, and K vary with peatland type. Most of these stoichiometric changes occur in the early stages of organic matter decomposition, where the litter structure remains intact. We estimate that ∼18 Pg of N has been stored in northern peatlands since deglaciation, reflecting high N accumulation rates (∼0.8 g m-2 yr-1), whereas P accumulation is small (∼0.3 Pg, ∼0.016 g m-2 yr-1), indicating that P is quickly recycled in the surface layers. ©2014. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78008
Appears in Collections: 气候变化事实与影响
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作者单位: Laboratory for Ecological Forecasting and Global Change, College of Forestry, Northwest A and F University, Yangling, China; Department of Geography and Global Environmental, Climate Change Centre, McGill University, Montreal, QC, Canada; Département de Géographie, Université de Montréal, Montréal, QC, Canada; Nature Conservancy of Canada, Toronto, ON, Canada
Recommended Citation:
Wang M,, Moore T,R,et al. The stoichiometry of carbon and nutrients in peat formation[J]. Global Biogeochemical Cycles,2015-01-01,29(2)