DOI: 10.1038/ngeo2907
论文题名: Globally important nitrous oxide emissions from croplands induced by freeze-thaw cycles
作者: Wagner-Riddle C. ; Congreves K.A. ; Abalos D. ; Berg A.A. ; Brown S.E. ; Ambadan J.T. ; Gao X. ; Tenuta M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 4 起始页码: 279
结束页码: 283
语种: 英语
Scopus关键词: agricultural land
; anthropogenic source
; emission inventory
; freeze-thaw cycle
; nitrogen
; nitrous oxide
; ozone depletion
; soil emission
; soil temperature
; trace gas
; Canada
; Manitoba
; Ontario [Canada]
英文摘要: Seasonal freezing induces large thaw emissions of nitrous oxide, a trace gas that contributes to stratospheric ozone destruction and atmospheric warming. Cropland soils are by far the largest anthropogenic source of nitrous oxide. However, the global contribution of seasonal freezing to nitrous oxide emissions from croplands is poorly quantified, mostly due to the lack of year-round measurements and difficulty in capturing short-lived pulses of nitrous oxide with traditional measurement methods. Here we present measurements collected with half-hourly resolution at two contrasting cropland sites in Ontario and Manitoba, Canada, over 14 and 9 years, respectively. We find that the magnitude of freeze-thaw-induced nitrous oxide emissions is related to the number of days with soil temperatures below 0 °C, and we validate these findings with emissions data from 11 additional sites from cold climates around the globe. Based on an estimate of cropland area experiencing seasonal freezing, reanalysis model estimates of soil temperature, and the relationship between cumulative soil freezing days and emissions that we derived from the cropland sites, we estimate that seasonally frozen cropland contributes 1.07 ± 0.59 Tg of nitrogen as nitrous oxide annually. We conclude that neglecting freeze-thaw emissions would lead to an underestimation of global agricultural nitrous oxide emissions by 17 to 28%. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105818
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: School of Environmental Science, University of Guelph, Guelph, ON, Canada; Department of Soil Quality, Wageningen University, PO Box 47, Wageningen, Netherlands; Department of Geography, University of Guelph, Guelph, ON, Canada; Department of Soil Science, University of Manitoba, Winnipeg, MB, Canada
Recommended Citation:
Wagner-Riddle C.,Congreves K.A.,Abalos D.,et al. Globally important nitrous oxide emissions from croplands induced by freeze-thaw cycles[J]. Nature Geoscience,2017-01-01,10(4)