DOI: 10.1111/gcb.12207
论文题名: CO2 emissions from land-use change affected more by nitrogen cycle, than by the choice of land-cover data
作者: Jain A.K. ; Meiyappan P. ; Song Y. ; House J.I.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 9 起始页码: 2893
结束页码: 2906
语种: 英语
英文关键词: Carbon cycle
; Carbon emissions
; Land-use change
; Model
; Nitrogen cycle
Scopus关键词: carbon cycle
; carbon dioxide
; carbon emission
; land cover
; land use change
; modeling
; nitrogen cycle
; carbon dioxide
; nitrogen
; article
; carbon cycle
; carbon emissions
; chemistry
; land-use change
; model
; nitrogen cycle
; theoretical model
; carbon cycle
; carbon emissions
; land-use change
; model
; nitrogen cycle
; Carbon Dioxide
; Models, Theoretical
; Nitrogen
英文摘要: The high uncertainty in land-based CO2 fluxes estimates is thought to be mainly due to uncertainty in not only quantifying historical changes among forests, croplands, and grassland, but also due to different processes included in calculation methods. Inclusion of a nitrogen (N) cycle in models is fairly recent and strongly affects carbon (C) fluxes. In this study, for the first time, we use a model with C and N dynamics with three distinct historical reconstructions of land-use and land-use change (LULUC) to quantify LULUC emissions and uncertainty that includes the integrated effects of not only climate and CO2 but also N. The modeled global average emissions including N dynamics for the 1980s, 1990s, and 2000-2005 were 1.8 ± 0.2, 1.7 ± 0.2, and 1.4 ± 0.2 GtC yr-1, respectively, (mean and range across LULUC data sets). The emissions from tropics were 0.8 ± 0.2, 0.8 ± 0.2, and 0.7 ± 0.3 GtC yr-1, and the non tropics were 1.1 ± 0.5, 0.9 ± 0.2, and 0.7 ± 0.1 GtC yr-1. Compared to previous studies that did not include N dynamics, modeled net LULUC emissions were higher, particularly in the non tropics. In the model, N limitation reduces regrowth rates of vegetation in temperate areas resulting in higher net emissions. Our results indicate that exclusion of N dynamics leads to an underestimation of LULUC emissions by around 70% in the non tropics, 10% in the tropics, and 40% globally in the 1990s. The differences due to inclusion/exclusion of the N cycle of 0.1 GtC yr-1 in the tropics, 0.6 GtC yr-1 in the non tropics, and 0.7 GtC yr-1 globally (mean across land-cover data sets) in the 1990s were greater than differences due to the land-cover data in the non tropics and globally (0.2 GtC yr-1). While land-cover information is improving with satellite and inventory data, this study indicates the importance of accounting for different processes, in particular the N cycle. © 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/62362
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Atmospheric Sciences, University of Illinois, Urbana, IL, 61801, United States; Department of Geography, Cabot Institute, University of Bristol, Bristol, BS8 1SS, United Kingdom
Recommended Citation:
Jain A.K.,Meiyappan P.,Song Y.,et al. CO2 emissions from land-use change affected more by nitrogen cycle, than by the choice of land-cover data[J]. Global Change Biology,2013-01-01,19(9)