DOI: 10.5194/cp-9-1287-2013
Scopus记录号: 2-s2.0-84883651539
论文题名: Transient simulations of the carbon and nitrogen dynamics in northern peatlands: From the Last Glacial Maximum to the 21st century
作者: Spahni R. ; Joos F. ; Stocker B.D. ; Steinacher M. ; Yu Z.C.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 3 起始页码: 1287
结束页码: 1308
语种: 英语
Scopus关键词: biosphere
; carbon
; carbon balance
; carbon flux
; greenhouse gas
; Holocene
; Last Glacial Maximum
; latitude
; nitrogen
; numerical model
; nutrient dynamics
; paleoclimate
; peatland
; respiration
; soil carbon
; twenty first century
英文摘要: The development of northern high-latitude peatlands played an important role in the carbon (C) balance of the land biosphere since the Last Glacial Maximum (LGM). At present, carbon storage in northern peatlands is substantial and estimated to be 500±100 PgC (1 PgC = 1015 g C). Here, we develop and apply a peatland module embedded in a dynamic global vegetation and land surface process model (LPX-Bern 1.0). The peatland module features a dynamic nitrogen cycle, a dynamic C transfer between peatland acrotelm (upper oxic layer) and catotelm (deep anoxic layer), hydrology- and temperature-dependent respiration rates, and peatland specific plant functional types. Nitrogen limitation down-regulates average modern net primary productivity over peatlands by about half. Decadal acrotelm-to-catotelm C fluxes vary between -20 and +50 gCm-2yr-1 over the Holocene. Key model parameters are calibrated with reconstructed peat accumulation rates from peat-core data. The model reproduces the major features of the peat core data and of the observation-based modern circumpolar soil carbon distribution. Results from a set of simulations for possible evolutions of northern peat development and areal extent show that soil C stocks in modern peatlands increased by 365-550 PgC since the LGM, of which 175-272 PgC accumulated between 11 and 5 kyr BP. Furthermore, our simulations suggest a persistent C sequestration rate of 35-50 Pg C per 1000 yr in present-day peatlands under current climate conditions, and that this C sink could either sustain or turn towards a source by 2100AD depending on climate trajectories as projected for different representative greenhouse gas concentration pathways. © Author(s) 2013. 资助项目: Swiss National Science Foundation
; European Commission
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49389
Appears in Collections: 气候变化与战略
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Recommended Citation:
Spahni R.,Joos F.,Stocker B.D.,et al. Transient simulations of the carbon and nitrogen dynamics in northern peatlands: From the Last Glacial Maximum to the 21st century[J]. Climate of the Past,2013-01-01,9(3)