Taxas de desmatamento anuais no bioma Cerrado: uma análise a partir de dados MODIS para o período de 2003 a 2007

• Ano de defesa: 2009
• Autor(a) principal: SILVA, Elaine Barbosa da
• Orientador(a): FERREIRA JÚNIOR, Laerte Guimarães
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Mestrado em Geografia
• Departamento: Ciências Humanas
• País: BR
• Palavras-chave em Português: Cerrado; taxas de desmatamento; fronteira agropecuária
• Palavras-chave em Inglês: Cerrado; deforestation rates; agricultural frontier
• Área do conhecimento CNPq: CNPQ::CIENCIAS HUMANAS::GEOGRAFIA
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tde/1904

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