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Universidade de Brasilia (2012)

Análise espaço-temporal de queimadas em áreas nativas de cerrado : RPPN Serra do Tombador, GO

Daldegan, Gabriel Antunes

Titre : Análise espaço-temporal de queimadas em áreas nativas de cerrado : RPPN Serra do Tombador, GO

Auteur : Daldegan, Gabriel Antunes

Université de soutenance : Universidade de Brasilia

Grade : Mestrado em Geografia 2012

Résumé
The Cerrado biome, the Brazilian savanna, second largest in Brazil after the Amazon, is considered to be the savanna with the highest biodiversity in the world. With the expansion of agriculture in the last decades, about 49% of the Cerrado has been transformed by human activity. The northeast region of Goiás state has one of the largest and best preserved regions in the Cerrado, and is home to several protected areas (PAs). Among them, the PRNP Serra Tombador Natural Preserve - RNST, which is the largest private preserve located in Goiás, and the fourth largest in the biome. The frequent fires that occur in Central Brazil in times of drought contribute to increasing rates of deforestation, and influence the distribution and density of the different Cerrado physiognomies, favoring the species that are most fire-resistant. The use of orbital sensor images is increasing in the area of environmental studies, including as a means to identifying fire-related scars in the vegetation. Understanding the behavior of the burning through multitemporal studies, and mapping the amount and extensions of the scars, can help managers better plan the preserves´ PA management and the action plans to combat uncontrolled wildfires. The present study aimed to map the fires that occurred in RNST and its surroundings in the period between 2001 and 2010, thus identifying their behavior. The technique used in this study was supervised classification through the application of the Mahalanobis algorithm in samples collected from each image. During the years covered by the study 69% of the areas analyzed had experienced fires. The year with the highest amount of mapped polygons and the largest area burned was 2004, followed by 2001, 2007 and 2010. The study also identified areas where fires are frequently recurrent, indicating places that deserve special attention. The physiognomies that suffered most fires were the savannas formations, where 89% of all fires occurred.

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Page publiée le 31 décembre 2015, mise à jour le 8 août 2018