DOI: 10.1111/gcb.13187
论文题名: Nitrogen deposition and greenhouse gas emissions from grasslands: Uncertainties and future directions
作者: Gomez-Casanovas N. ; Hudiburg T.W. ; Bernacchi C.J. ; Parton W.J. ; Delucia E.H.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 4 起始页码: 1348
结束页码: 1360
语种: 英语
英文关键词: CH 4
; Grassland
; Methane
; N2O
; Net ecosystem CO2 exchange
; Net ecosystem productivity
; Nitrogen deposition
; Nitrogen fertilization
; Nitrous oxide
; Uncertainty
Scopus关键词: deposition
; future prospect
; global change
; grassland
; greenhouse gas
; literature review
; methane
; net ecosystem exchange
; net ecosystem production
; nitrogen
; nitrous oxide
; twenty first century
; uncertainty analysis
; air pollutant
; carbon dioxide
; methane
; nitrogen
; nitrous oxide
; air pollutant
; analysis
; grassland
; theoretical model
; uncertainty
; Air Pollutants
; Carbon Dioxide
; Grassland
; Methane
; Models, Theoretical
; Nitrogen
; Nitrous Oxide
; Uncertainty
英文摘要: Increases in atmospheric nitrogen deposition (Ndep) can strongly affect the greenhouse gas (GHG; CO2, CH4, and N2O) sink capacity of grasslands as well as other terrestrial ecosystems. Robust predictions of the net GHG sink strength of grasslands depend on how experimental N loads compare to projected Ndep rates, and how accurately the relationship between GHG fluxes and Ndep is characterized. A literature review revealed that the vast majority of experimental N loads were higher than levels these ecosystems are predicted to experience in the future. Using a process-based biogeochemical model, we predicted that low levels of Ndep either enhanced or reduced the net GHG sink strength of most grasslands, but as experimental N loads continued to increase, grasslands transitioned to a N saturation-decline stage, where the sensitivity of GHG exchange to further increases in Ndep declined. Most published studies represented treatments well into the N saturation-decline stage. Our model results predict that the responses of GHG fluxes to N are highly nonlinear and that the N saturation thresholds for GHGs varied greatly among grasslands and with fire management. We predict that during the 21st century some grasslands will be in the N limitation stage where others will transition into the N saturation-decline stage. The linear relationship between GHG sink strength and N load assumed by most studies can overestimate or underestimate predictions of the net GHG sink strength of grasslands depending on their N baseline status. The next generation of global change experiments should be designed at multiple N loads consistent with future Ndep rates to improve our empirical understanding and predictive ability. Copyright © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61423
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL, United States; Institute of Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, United States; Energy Biosciences Institute, University of Illinois at Urbana-Champaign, Urbana, IL, United States; Department of Forest, Rangeland, and Fire Sciences, University of Idaho, Moscow, ID, United States; Global Change and Photosynthesis Research Unit, Agricultural Research Service, USDA, Urbana, IL, United States; National Renewable Ecology Laboratory, Colorado State University, Ft. Collins, CO, United States
Recommended Citation:
Gomez-Casanovas N.,Hudiburg T.W.,Bernacchi C.J.,et al. Nitrogen deposition and greenhouse gas emissions from grasslands: Uncertainties and future directions[J]. Global Change Biology,2016-01-01,22(4)