DOI: 10.1111/gcb.13521
论文题名: Carbon emissions from agricultural expansion and intensification in the Chaco
作者: Baumann M. ; Gasparri I. ; Piquer-Rodríguez M. ; Gavier Pizarro G. ; Griffiths P. ; Hostert P. ; Kuemmerle T.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期: 5 起始页码: 1902
结束页码: 1916
语种: 英语
英文关键词: carbon bookkeeping model
; deforestation frontiers
; land-use change
; Landsat image archive
; post-deforestation dynamics
; savannas
; tropical dry forests
Scopus关键词: Bos
; Glycine max
英文摘要: Carbon emissions from land-use changes in tropical dry forest systems are poorly understood, although they are likely globally significant. The South American Chaco has recently emerged as a hot spot of agricultural expansion and intensification, as cattle ranching and soybean cultivation expand into forests, and as soybean cultivation replaces grazing lands. Still, our knowledge of the rates and spatial patterns of these land-use changes and how they affected carbon emissions remains partial. We used the Landsat satellite image archive to reconstruct land-use change over the past 30 years and applied a carbon bookkeeping model to quantify how these changes affected carbon budgets. Between 1985 and 2013, more than 142 000 km2 of the Chaco's forests, equaling 20% of all forest, was replaced by croplands (38.9%) or grazing lands (61.1%). Of those grazing lands that existed in 1985, about 40% were subsequently converted to cropland. These land-use changes resulted in substantial carbon emissions, totaling 824 Tg C between 1985 and 2013, and 46.2 Tg C for 2013 alone. The majority of these emissions came from forest-to-grazing-land conversions (68%), but post-deforestation land-use change triggered an additional 52.6 Tg C. Although tropical dry forests are less carbon-dense than moist tropical forests, carbon emissions from land-use change in the Chaco were similar in magnitude to those from other major tropical deforestation frontiers. Our study thus highlights the urgent need for an improved monitoring of the often overlooked tropical dry forests and savannas, and more broadly speaking the value of the Landsat image archive for quantifying carbon fluxes from land change. © 2016 John Wiley & Sons Ltd 资助项目: Baumann, M.
; Geography Department, Humboldt-Universität zu Berlin, Unter den Linden 6, Germany
; 电子邮件: matthias.baumann@geo.hu-berlin.de
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60959
Appears in Collections: 影响、适应和脆弱性
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作者单位: Geography Department, Humboldt-Universität zu Berlin, Unter den Linden 6, Berlin, Germany; CONICET, Instituto de Ecología Regional, Universidad Nacional de Tucumán, CC: 34, Yerba Buena, Tucumán, Argentina; Integrative Research Institute on Transformations of Human-Environment Systems (IRI THESys), Humboldt-Universität zu Berlin, Unter den Linden 6, Berlin, Germany; Instituto Nacional de Tecnología Agropecuaria (INTA), Instituto de Recursos Biológicos (IRB-CNIA), De los Reseros y Las Cabañas S/N HB1712WAA Hurlingham, Buenos Aires, Argentina
Recommended Citation:
Baumann M.,Gasparri I.,Piquer-Rodríguez M.,et al. Carbon emissions from agricultural expansion and intensification in the Chaco[J]. Global Change Biology,2017-01-01,23(5)