Taxas de desmatamento anuais no bioma Cerrado: uma análise a partir de dados MODIS para o período de 2003 a 2007
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2009-03-19
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Universidade Federal de Goiás
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The purpose of this study was to evaluate the use of deforestation rates, for the 2003 2007 period, aiming at a better understanding of the current transformations of the
Cerrado biome, as well as the generation of future scenarios. Prior to the rate estimations, a thorough physical characterization of the landscape and a comprehensive analysis of the occupation history of the biome were conducted. Concerning the rates, these were obtained
for both the municipalities of the State of Goias, as well as for the entire biome, according to the Ottobacias criteria (level 3) for watershed divisions. In particular, the calculation of the
rates took into account: a) land cover land use maps based on the visual interpretation of 2001 2002 Landsat TM imagery (produced, respectively, within the scope of the projects Identification of Priority Biodiversity Conservation Areas in the State of Goias PDIAP and Conservation and Sustainable Use of the Brazilian Biological Diversity PROBIO) and b) the annual deforestation dataset generated by the Cerrado Warning Deforestation System (SIAD Cerrado), for the period between October 2003 October 2007, based on the comparative analysis of MODIS vegetation index images. In both instances of analysis, the main goals were the identification of spatial and temporal patterns, as well as the
determination of amplitudes, on an annual basis, for the overall deforestation rates. In relation to the Goiás municipalities, it can be observed that the deforestations, although distributed in very heterogeneous patches, tend to be correlated to the spatial distribution of the major agricultural crops, particularly when the whole period i.e. 2003 2007 is considered. Regarding the Ottobacias division, it is possible to identify, in spite of the large annual
variation, certain spatial and temporal patterns of the deforestation rates, which also seem to be well correlated to the agricultural production. Nevertheless, our results suggest that deforestation rates prone to significant spatial and temporal fluctuations - should be used in a rather cautious manner, particularly when serving as an inertial temporal driver for the generation of trends and future scenarios
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SILVA, Elaine Barbosa da. Annual ratesof deforestation in the Cerrado Biome: an analysis from the modis data for the period 2003 to 2007. 2009. 102 f. Dissertação (Mestrado em Ciências Humanas) - Universidade Federal de Goiás, Goiânia, 2009.