DOI: 10.1111/gcb.12305
论文题名: Soil organic carbon dust emission: An omitted global source of atmospheric CO2
作者: Chappell A. ; Webb N.P. ; Butler H.J. ; Strong C.L. ; Mctainsh G.H. ; Leys J.F. ; Viscarra Rossel R.A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 10 起始页码: 3238
结束页码: 3244
语种: 英语
英文关键词: Australia
; Carbon accounting
; Carbon budgets
; Carbon dioxide
; Dust emission
; Soil organic carbon
Scopus关键词: atmosphere-biosphere interaction
; carbon budget
; carbon cycle
; carbon dioxide
; carbon sink
; dust
; organic carbon
; soil organic matter
; wind erosion
; Australia
; carbon
; carbon dioxide
; soil organic carbon
; article
; Australia
; carbon accounting
; carbon budgets
; chemistry
; dust
; dust emission
; soil
; spatiotemporal analysis
; theoretical model
; wind
; Australia
; carbon accounting
; carbon budgets
; carbon dioxide
; dust emission
; soil organic carbon
; Australia
; Carbon
; Carbon Dioxide
; Dust
; Models, Theoretical
; Soil
; Spatio-Temporal Analysis
; Wind
英文摘要: Soil erosion redistributes soil organic carbon (SOC) within terrestrial ecosystems, to the atmosphere and oceans. Dust export is an essential component of the carbon (C) and carbon dioxide (CO2) budget because wind erosion contributes to the C cycle by removing selectively SOC from vast areas and transporting C dust quickly offshore; augmenting the net loss of C from terrestrial systems. However, the contribution of wind erosion to rates of C release and sequestration is poorly understood. Here, we describe how SOC dust emission is omitted from national C accounting, is an underestimated source of CO2 and may accelerate SOC decomposition. Similarly, long dust residence times in the unshielded atmospheric environment may considerably increase CO2 emission. We developed a first approximation to SOC enrichment for a well-established dust emission model and quantified SOC dust emission for Australia (5.83 Tg CO2-e yr-1) and Australian agricultural soils (0.4 Tg CO2-e yr-1). These amount to underestimates for CO2 emissions of ≈10% from combined C pools in Australia (year = 2000), ≈5% from Australian Rangelands and ≈3% of Australian Agricultural Soils by Kyoto Accounting. Northern hemisphere countries with greater dust emission than Australia are also likely to have much larger SOC dust emission. Therefore, omission of SOC dust emission likely represents a considerable underestimate from those nations' C accounts. We suggest that the omission of SOC dust emission from C cycling and C accounting is a significant global source of uncertainty. Tracing the fate of wind-eroded SOC in the dust cycle is therefore essential to quantify the release of CO2 from SOC dust to the atmosphere and the contribution of SOC deposition to downwind C sinks. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62311
Appears in Collections: 影响、适应和脆弱性
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作者单位: CSIRO Sustainable Agriculture National Research Flagship, CSIRO Land and Water, GPO Box 1666, Canberra, ACT, 2601, Australia; USDA-ARS Jornada Experimental Range, MSC 3 JER, NMSU, Box 30003, Las Cruces, NM, 88003-8003, United States; Australian Centre for Sustainable Catchments, University of Southern Queensland, Toowoomba, QLD, 4350, Australia; Atmospheric Environment Research Centre, Griffith University, Brisbane, QLD, 4111, Australia; Scientific Services Division, NSW Office of Environment and Heritage, Gunnedah, NSW, 2380, Australia
Recommended Citation:
Chappell A.,Webb N.P.,Butler H.J.,et al. Soil organic carbon dust emission: An omitted global source of atmospheric CO2[J]. Global Change Biology,2013-01-01,19(10)