Avaliação dos fragmentos florestais do município de Jaboticabal-SP
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Data
2009-01-01
Autores
Greggio, Thiago Claudino [UNESP]
Pissarra, Teresa Cristina Tarlé [UNESP]
Rodrigues, Flávia Mazzer [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade de Investigações Florestais
Resumo
Este estudo foi conduzido no Município de Jaboticabal, SP, com o objetivo de avaliar a evolução temporal e o número de fragmentos florestais no período de 29 anos, utilizando-se técnicas de sensoriamento remoto e fotointerpretação. Para a elaboração dos mapas foram utilizadas Cartas do IBGE de 1971 e fotografias áreas de 2000. Os resultados apontaram diminuição das áreas de floresta. em 1971, o município apresentava 3,63% da área total com fragmentos florestais, e em 2000 observou-se, apenas, 1,55% dessa área. Tal fato ocorreu tendo em vista o avanço de práticas agrícolas com predominância da cultura de cana-de-açúcar. A porcentagem de fragmentos florestais em 1971, com áreas menores que 10 ha, era de 46,72%, já em 2000 esse número passou para 78,51%, concluindo-se um processo de fragmentação acentuado (31,79%) no período analisado. Os fragmentos florestais com maior extensão em 1971 se apresentaram extremamente fragmentados em 2000. Aproximadamente 60% dos fragmentos, nas duas épocas, apresentavam forma alongada, indicando alta relação perímetro/área.
This study was conducted in Jaboticabal-SP, to evaluate the evolution and number of forest fragments in the period of 29 years, using remote sensing and photointerpretation techniques. The IBGE Maps (1971) and 2000 aerial photos were used to map the area. The reduction of the natural forest areas occurred during the time evaluated. In 1971, the municipality presented 3.63% of the total area in forest fragments, but only 1.55% of this area in 2000. This was due to the advance of agricultural practices, mainly sugarcane, in the area. The percentage of forest fragments lower than 10ha, in 1971, was 46.72% of the total area, but in 2000, this number increased to 78.51%,reaching a marked fragmentation process (31.79%)in the analyzed period. The forest fragments with higher extension in 1971 were extremely fragmented in 2000. Approximately 60% of these areas, at both times, presented long forms, indicating a high relation between perimeter and area.
This study was conducted in Jaboticabal-SP, to evaluate the evolution and number of forest fragments in the period of 29 years, using remote sensing and photointerpretation techniques. The IBGE Maps (1971) and 2000 aerial photos were used to map the area. The reduction of the natural forest areas occurred during the time evaluated. In 1971, the municipality presented 3.63% of the total area in forest fragments, but only 1.55% of this area in 2000. This was due to the advance of agricultural practices, mainly sugarcane, in the area. The percentage of forest fragments lower than 10ha, in 1971, was 46.72% of the total area, but in 2000, this number increased to 78.51%,reaching a marked fragmentation process (31.79%)in the analyzed period. The forest fragments with higher extension in 1971 were extremely fragmented in 2000. Approximately 60% of these areas, at both times, presented long forms, indicating a high relation between perimeter and area.
Descrição
Palavras-chave
Forest fragment, Mapping, Remote sensing, Fragmentos florestais, Mapeamento, Sensoriamento remoto