DOI: 10.1111/gcb.14287
Scopus记录号: 2-s2.0-85047527463
论文题名: Cross-scale controls on carbon emissions from boreal forest megafires
作者: Walker X.J. ; Rogers B.M. ; Baltzer J.L. ; Cumming S.G. ; Day N.J. ; Goetz S.J. ; Johnstone J.F. ; Schuur E.A.G. ; Turetsky M.R. ; Mack M.C.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 9 起始页码: 4251
结束页码: 4265
语种: 英语
英文关键词: black spruce
; carbon combustion
; fire severity
; jack pine
; Picea mariana
; Pinus banksiana
; taiga plains
; taiga shield
Scopus关键词: Picea mariana
; Pinus banksiana
英文摘要: Climate warming and drying is associated with increased wildfire disturbance and the emergence of megafires in North American boreal forests. Changes to the fire regime are expected to strongly increase combustion emissions of carbon (C) which could alter regional C balance and positively feedback to climate warming. In order to accurately estimate C emissions and thereby better predict future climate feedbacks, there is a need to understand the major sources of heterogeneity that impact C emissions at different scales. Here, we examined 211 field plots in boreal forests dominated by black spruce (Picea mariana) or jack pine (Pinus banksiana) of the Northwest Territories (NWT), Canada after an unprecedentedly large area burned in 2014. We assessed both aboveground and soil organic layer (SOL) combustion, with the goal of determining the major drivers in total C emissions, as well as to develop a high spatial resolution model to scale emissions in a relatively understudied region of the boreal forest. On average, 3.35 kg C m−2 was combusted and almost 90% of this was from SOL combustion. Our results indicate that black spruce stands located at landscape positions with intermediate drainage contribute the most to C emissions. Indices associated with fire weather and date of burn did not impact emissions, which we attribute to the extreme fire weather over a short period of time. Using these results, we estimated a total of 94.3 Tg C emitted from 2.85 Mha of burned area across the entire 2014 NWT fire complex, which offsets almost 50% of mean annual net ecosystem production in terrestrial ecosystems of Canada. Our study also highlights the need for fine-scale estimates of burned area that represent small water bodies and regionally specific calibrations of combustion that account for spatial heterogeneity in order to accurately model emissions at the continental scale. © 2018 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110242
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, United States; Woods Hole Research Center, Falmouth, MA, United States; Biology Department, Wilfrid Laurier University, Waterloo, ON, Canada; Department of Wood and Forest Sciences, Laval University, Quebec City, QC, Canada; School of Informatics, Computing and Cyber Systems (SICCS), Northern Arizona University, Flagstaff, AZ, United States; Department of Biology, University of Saskatchewan, Saskatoon, SK, Canada; Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
Recommended Citation:
Walker X.J.,Rogers B.M.,Baltzer J.L.,et al. Cross-scale controls on carbon emissions from boreal forest megafires[J]. Global Change Biology,2018-01-01,24(9)