Mapeamento semidetalhado do uso da terra do Bioma Cerrado

Abstract

Resumo -O objetivo deste trabalho foi mapear o uso da terra do Bioma Cerrado na escala de 1:250.000. As seguintes classes de uso da terra foram consideradas: culturas agrícolas, pastagens cultivadas, reflorestamentos, áreas urbanas e áreas de mineração. A metodologia envolveu a segmentação de imagens do satélite Landsat, a classificação visual dos segmentos e a análise da exatidão global do mapa final. Aproximadamente 39,5% do Cerrado apresentaram algum tipo de uso de terra. Pastagens cultivadas e culturas agrícolas foram as classes predominantes, com 26,5 e 10,5%, respectivamente.Termos para indexação: Landsat, PROBIO, segmentação de imagens, sensoriamento remoto. Semidetailed land use mapping in the CerradoAbstract -The objective of this work was to map the land use in Cerrado at the 1:250,000 scale. The following classes of land use were considered: croplands, planted pasturelands, reforestations, urban settlements and mining areas. The methodological approach involved Landsat image segmentation, visual classification of the segments and analysis of the global accuracy of the final map. Approximately 39.5% of Cerrado presented some type of land use activity. Planted pasturelands and croplands were the dominant classes, with 26.5 and 10.5%, respectively.

Evolution of seed dispersal in the Cerrado biome: ecological and phylogenetic considerations

“…Models of occupation and land use in Cerrado have led to loss of more than 50% of the original vegetation of the biome (Sano et al 2008), bringing consequences such as soil degradation, increased invasive species and compromising the water cycles (Klink & Machado 2005), with the deforestation of Cerrado even affecting rainfall patterns and increasing the duration of the dry season in Amazon regions (Costa & Pires 2010). The observation that biomes are phylogenetically conserved (Crisp et al 2009) also implies that its evolutionary potential could be seriously compromised by environmental changes, so that ecological processes such as seed dispersal, which have strong links with the angiosperms phylogeny, could be dramatically affected by the decline in biodiversity, with whole clades being affected, not just species in particular, causing a break in the phylogeny of plants.…”

Seasonality in insect abundance in the "Cerrado" of Goiás State, Brazil

“…It covers practically the entire Midwest region, parts of the North, Northeast and Southeast regions and only 2% of the South region (Ribeiro & Walter 1998;Sano et al 2008). It contains about 30% of Brazil's biodiversity (Dias 1996) and is one of the most threatened biomes in the world (Mittermeier et al 2005).…”

Estoque de Serapilheira em Três Fisionomias no Cerrado do Distrito Federal

“…Esse tipo de vegetação apresenta uma importante função ecológica e hidrológica, uma vez que protege as margens dos rios, evita assoreamentos e garante, assim, a qualidade e a quantidade de água de seu leito (Ribeiro & Walter, 2008;Sano et al, 2008).…”

“…Entre esses usos, as classes mais representativas são as pastagens cultivadas e atividades agropecuárias que envolvem cultivo de cereais e produção de carne e ocupam, respectivamente, 26,5% e 10,5% do Cerrado, tendo tornado o Brasil um dos maiores exportadores de alimentos (Sano et al, 2008;CONAB, 2013).…”