DOI: 10.1111/gcb.12800
论文题名: Pyrogenic organic matter production from wildfires: a missing sink in the global carbon cycle
作者: Santín C. ; Doerr S.H. ; Preston C.M. ; González-Rodríguez G.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 4 起始页码: 1621
结束页码: 1633
语种: 英语
英文关键词: Biochar
; Black carbon
; Boreal forest
; Carbon emissions
; Charcoal
; Firesmart experimental fire
; Pyrogenic carbon
Scopus关键词: black carbon
; boreal forest
; carbon cycle
; carbon emission
; charcoal
; global change
; organic matter
; wildfire
; Pinus banksiana
; carbon
; organic compound
; biomass
; carbon cycle
; chemistry
; fire
; forest
; Northwest Territories
; pine
; theoretical model
; Biomass
; Carbon
; Carbon Cycle
; Fires
; Forests
; Models, Theoretical
; Northwest Territories
; Organic Chemicals
; Pinus
英文摘要: Wildfires release substantial quantities of carbon (C) into the atmosphere but they also convert part of the burnt biomass into pyrogenic organic matter (PyOM). This is richer in C and, overall, more resistant to environmental degradation than the original biomass, and, therefore, PyOM production is an efficient mechanism for C sequestration. The magnitude of this C sink, however, remains poorly quantified, and current production estimates, which suggest that ~1-5% of the C affected by fire is converted to PyOM, are based on incomplete inventories. Here, we quantify, for the first time, the complete range of PyOM components found in-situ immediately after a typical boreal forest fire. We utilized an experimental high-intensity crown fire in a jack pine forest (Pinus banksiana) and carried out a detailed pre- and postfire inventory and quantification of all fuel components, and the PyOM (i.e., all visually charred, blackened materials) produced in each of them. Our results show that, overall, 27.6% of the C affected by fire was retained in PyOM (4.8 ± 0.8 t C ha-1), rather than emitted to the atmosphere (12.6 ± 4.5 t C ha-1). The conversion rates varied substantially between fuel components. For down wood and bark, over half of the C affected was converted to PyOM, whereas for forest floor it was only one quarter, and less than a tenth for needles. If the overall conversion rate found here were applicable to boreal wildfire in general, it would translate into a PyOM production of ~100 Tg C yr-1 by wildfire in the global boreal regions, more than five times the amount estimated previously. Our findings suggest that PyOM production from boreal wildfires, and potentially also from other fire-prone ecosystems, may have been underestimated and that its quantitative importance as a C sink warrants its inclusion in the global C budget estimates. © 2014 The Authors. Global Change Biology Published by John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61629
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Geography, College of Science, Swansea University, Swansea, United Kingdom; Pacific Forestry Centre of Natural Resources Canada, Vancouver, Canada; Department of Statistics and Operational Research and Mathematics Didactics, University of Oviedo, Oviedo, Spain
Recommended Citation:
Santín C.,Doerr S.H.,Preston C.M.,et al. Pyrogenic organic matter production from wildfires: a missing sink in the global carbon cycle[J]. Global Change Biology,2015-01-01,21(4)