Use este identificador para citar ou linkar para este item:
Título: Forest fires in southwestern Brazilian Amazonia: Estimates of area and potential carbon emissions
Autor(es): Vasconcelos, Sumaia Saldanha
Philip Martin Fearnside
P.M.L.A. Graça
Euler Nogueira
Luis Cláudio de Oliveira
Evandro Orfanó Figueiredo
Assunto: Incêndio florestal
mudanças climaticas
ISSN: 0378-1127
Revista: Forest Ecology and Management
Volume: 291
Resumo: Areas affected by forest fires that occurred in 2005 were mapped in the municipalities of Boca do Acre and Labrea (in the southern part of Brazil's state of Amazonas) and estimates were made of the loss of biomass and carbon stock and the committed emissions from increased tree mortality due to fire. Fire scars observed on Landsat-5 TM satellite images from 2004 to 2006 were visually interpreted and digitized; over 865.6 km(2) of forest affected by fire were mapped, the majority (2.9% of the total forest cover) concentrated along the southern edges of the municipalities, which border on the states of Rondonia and Acre. The greatest loss of biomass due to the increase in tree mortality was indicated by the survey made 4 years after the fires: 4.5 x 10(6) Mg total (above + below-ground) and 3.7 x 10(6) Mg (only above-ground). Consequently, 2.2 x 10(6) Mg C (total) and 1.8 x 10(6) Mg C (above-ground) of potential carbon emissions were committed from the initial burn of forest biomass and from trees killed by the fire. Emissions occur both through oxidation of dead biomass by decomposition or through combustion in subsequent fire events. Our results indicate that fires can affect extensive tracts of forest and can emit significant amounts of carbon to the atmosphere in periods of drought. Fire plays a significant role as a threat to the biological balance of the forest and causes loss of biomass and emission of greenhouse gases that have critical implications for the future of forests in the Amazon. (C) 2012 Elsevier B.V. All rights reserved.
ISSN: 0378-1127
Aparece nas coleções:Coordenação de Dinâmica Ambiental (CDAM)

Arquivos associados a este item:
Não existem arquivos associados a este item.

Este item está licenciada sob uma Licença Creative Commons Creative Commons