Dinâmica agrícola e desmatamentos em áreas de cerrado: uma análise a partir de dados censitários e imagens de resolução moderada
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Data
2009
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Resumo
About 39% of the Cerrado, the second largest biome in South America, have been already converted to pasture and agriculture fields. In Goiás, the only state thoroughly inserted within the Cerrado limits, the situation is even more severe, as the agribusiness already replaced approximately 63% of its area. The expectation is that the deforestation, which is still occurring, at annual rates varying from 0.21% to 0.86%, will follow an upward trend, mainly due to the increasing demand for biofuels. This study, based on the IBGE agricultural census data from 2001 to 2005 and on deforestation data mapped through the Deforestation Warning System (SIAD), via the comparison of 2003 – 2004 moderate resolution imagery (MODIS), assessed the correlation between the agriculture expansion and deforestation in Goiás, i.e. how much of this expansion depends on and drives land conversion. As our results suggest, the detected deforestation is related to the increments in the agricultural area that took place from 2003 to 2004 (r = 0.40 to 0.67), as well as to the 2004 – 2005 increments (r = 0.23 to 0.43), particularly when considering the municipalities most preeminent in the agribusiness (e.g. Rio Verde). However, these deforestations, which correspond to only 20% and 11% of the agricultural expansion in the two periods evaluated, are also associated to other types of land occupation (e.g. new pasturelands). The expectation is that the incorporation of additional time series in future analysis will allow a more thorough evaluation of the impacts of the sugarcane expansion over the occupation and territorial dynamics in the state.
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Bioma cerrado, Fronteira agrícola, Sensores remotos, Imagens MODIS, SIAD, Cerrado biome, Agricultural frontier, MODIS products, Remote sensing
Citação
FERREIRA, Laerte Guimarães et al. Dinâmica agrícola e desmatamentos em áreas de cerrado: uma análise a partir de dados censitários e imagens de resolução moderada. Revista Brasileira de Cartografia, Rio de Janeiro, v. 61, n. 2, p. 117-127, 2009.