DOI: 10.1111/gcb.12174
论文题名: Agricultural intensification in Brazil and its effects on land-use patterns: An analysis of the 1975-2006 period
作者: Barretto A.G.O.P. ; Berndes G. ; Sparovek G. ; Wirsenius S.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 6 起始页码: 1804
结束页码: 1815
语种: 英语
英文关键词: Agricultural yield
; Cropland pasture
; Land sparing
; Land-use change
Scopus关键词: agricultural history
; agricultural intensification
; agricultural production
; crop yield
; deforestation
; GIS
; land use change
; pasture
; agriculture
; article
; Brazil
; Agriculture
; Brazil
; Brazil
英文摘要: Does agricultural intensification reduce the area used for agricultural production in Brazil? Census and other data for time periods 1975-1996 and 1996-2006 were processed and analyzed using Geographic Information System and statistical tools to investigate whether and if so, how, changes in yield and stocking rate coincide with changes in cropland and pasture area. Complementary medium-resolution data on total farmland area changes were used in a spatially explicit assessment of the land-use transitions that occurred in Brazil during 1960-2006. The analyses show that in agriculturally consolidated areas (mainly southern and southeastern Brazil), land-use intensification (both on cropland and pastures) coincided with either contraction of both cropland and pasture areas, or cropland expansion at the expense of pastures, both cases resulting in farmland stability or contraction. In contrast, in agricultural frontier areas (i.e., the deforestation zones in central and northern Brazil), land-use intensification coincided with expansion of agricultural lands. These observations provide support for the thesis that (i) technological improvements create incentives for expansion in agricultural frontier areas; and (ii) farmers are likely to reduce their managed acreage only if land becomes a scarce resource. The spatially explicit examination of land-use transitions since 1960 reveals an expansion and gradual movement of the agricultural frontier toward the interior (center-western Cerrado) of Brazil. It also indicates a possible initiation of a reversed trend in line with the forest transition theory, i.e., agricultural contraction and recurring forests in marginally suitable areas in southeastern Brazil, mainly within the Atlantic Forest biome. The significant reduction in deforestation that has taken place in recent years, despite rising food commodity prices, indicates that policies put in place to curb conversion of native vegetation to agriculture land might be effective. © 2013 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62441
Appears in Collections: 影响、适应和脆弱性
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作者单位: University of São Paulo, Luiz de Queiroz College of Agriculture, Department of Soil Science, Av. Pádua Dias, 11, Piracicaba (SP) 13418-900, Brazil; Chalmers University of Technology, Department of Energy and Environment, Division of Physical Resource Theory, SE-412 96 Göteborg, Sweden
Recommended Citation:
Barretto A.G.O.P.,Berndes G.,Sparovek G.,et al. Agricultural intensification in Brazil and its effects on land-use patterns: An analysis of the 1975-2006 period[J]. Global Change Biology,2013-01-01,19(6)