DOI: 10.1111/gcb.13298
论文题名: Land-use change affects water recycling in Brazil's last agricultural frontier
作者: Spera S.A. ; Galford G.L. ; Coe M.T. ; Macedo M.N. ; Mustard J.F.
刊名: Global Change Biology
出版年: 2016
卷: 22, 期: 10 起始页码: 3405
结束页码: 3413
语种: 英语
英文关键词: agriculture
; Cerrado
; deforestation
; evapotranspiration
; land-use change
; Matopiba
; remote sensing
Scopus关键词: agricultural production
; biodiversity
; climate feedback
; deforestation
; evapotranspiration
; hydrological cycle
; land cover
; land use change
; rainfed agriculture
; remote sensing
; Brazil
; Glycine max
; Zea mays
英文摘要: Historically, conservation-oriented research and policy in Brazil have focused on Amazon deforestation, but a majority of Brazil's deforestation and agricultural expansion has occurred in the neighboring Cerrado biome, a biodiversity hotspot comprised of dry forests, woodland savannas, and grasslands. Resilience of rainfed agriculture in both biomes likely depends on water recycling in undisturbed Cerrado vegetation; yet little is known about how changes in land-use and land-cover affect regional climate feedbacks in the Cerrado. We used remote sensing techniques to map land-use change across the Cerrado from 2003 to 2013. During this period, cropland agriculture more than doubled in area from 1.2 to 2.5 million ha, with 74% of new croplands sourced from previously intact Cerrado vegetation. We find that these changes have decreased the amount of water recycled to the atmosphere via evapotranspiration (ET) each year. In 2013 alone, cropland areas recycled 14 km3 less (−3%) water than if the land cover had been native Cerrado vegetation. ET from single-cropping systems (e.g., soybeans) is less than from natural vegetation in all years, except in the months of January and February, the height of the growing season. In double-cropping systems (e.g., soybeans followed by corn), ET is similar to or greater than natural vegetation throughout a majority of the wet season (December–May). As intensification and extensification of agricultural production continue in the region, the impacts on the water cycle and opportunities for mitigation warrant consideration. For example, if an environmental goal is to minimize impacts on the water cycle, double cropping (intensification) might be emphasized over extensification to maintain a landscape that behaves more akin to the natural system. © 2016 John Wiley & Sons Ltd 资助项目: Spera, S.A.
; Department of Earth, Environmental, and Planetary Sciences, Brown University, 324 Brook Street, United States
; 电子邮件: stephanie_spera@brown.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61284
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Earth, Environmental, and Planetary Sciences, Brown University, 324 Brook Street, Providence, RI, United States; Institute at Brown for Environment and Society, Brown University, 85 Waterman Street, Providence, RI, United States; Gund Institute for Ecological Economics, Rubenstein School of Environmental and Natural Resources, University of Vermont, 617 Main Street, Burlington, VT, United States; Woods Hole Research Center, 149 Woods Hole Road, Falmouth, MA, United States
Recommended Citation:
Spera S.A.,Galford G.L.,Coe M.T.,et al. Land-use change affects water recycling in Brazil's last agricultural frontier[J]. Global Change Biology,2016-01-01,22(10)