Land-use in Amazonia and the Cerrado of Brazil

19 de janeiro de 1997

jan 19, 1997

Daniel C. Nepstad, Carlos A. Kunk, Christopher Uhl, Ima Vieira, Paul Lefebvre, Marcos Pedlowski, Eraldo Matricardi, Gustavo Negreiros, Irving F. Brown, Eufran Amaral, Alfredo Homma , Robert Walker

 

The total area and annual rate of native vegetation clearing is greatest in the Cerrado region followed by the Brazilian states of Pará, Mato Grosso, Maranhào and Rondônia. Amazonian forest clearing proceeds most quickly where abundant natural resources (wood or land) are accessible by roads and close to markets. These regions are concentrated along the eastern and southern f1anks of Amazonia, particularly in eastern Pará, Cuiabá and Rondônia. There are still large discrepancies in estimates of annual deforestation; Landsat (Thematic Mapper-based) mapping of deforestation in the closed-canopy forests of Amazonia has not include non-Brazilian countries and is incomplete for the cerrado biome.

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Effects of partial throughfall exclusion on the phenology of Coussarea racemosa (Rubiaceae) in an east-central Amazon rainforest

Effects of partial throughfall exclusion on the phenology of Coussarea racemosa (Rubiaceae) in an east-central Amazon rainforest

Severe droughts may alter the reproductive phenology of tropical tree species, but our understanding of these effects has been hampered by confounded variation in drought, light and other factors during natural drought events. We used a large-scale experimental reduction of throughfall in an easterncentral Amazon forest to study the phenological response to drought of an abundant subcanopy tree, Coussarea racemosa. We hypothesized that drought would alter the production and the timing of reproduction, as well as the number of viable fruits.

Oportunidades e desafios climáticos no Cerrado brasileiro

Oportunidades e desafios climáticos no Cerrado brasileiro

O Cerrado é um bioma crucial para o desenvolvimento econômico brasileiro, a produção de alimentos, a manutenção dos ciclos hidrológicos, a preservação da biodiversidade e os esforços globais de mitigação e adaptação. Apesar de sua relevância, o bioma muitas vezes é negligenciado nos debates nacionais e internacionais sobre mudanças climáticas. A atual taxa de conversão do Cerrado não é sustentável, liberando um volume de dióxido de carbono não estimado anteriormente.