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Título: | Forest fires in southwestern Brazilian Amazonia: Estimates of area and potential carbon emissions |
Autor: | Vasconcelos, Sumaia Saldanha de Fearnside, Philip Martin Graça, Paulo Maurício Lima Alencastro de Nogueira, Euler Melo Oliveira, Luís Cláudio de Figueiredo, Evandro Orfanó |
Palavras-chave: | Amazon Forests Brazilian Amazonia Carbon Emissions Carbon Stocks Fire Event Fire Scars Forest Biomass Forest Cover Forest Fires Landsat-5 Satellite Images Tree Mortality Biomass Carbon Deforestation Global Warming Greenhouse Gases Satellite Imagery Fires Aboveground Biomass Belowground Biomass Carbon Emission Carbon Sequestration Combustion Decomposition Digitization Drought Forest Cover Forest Fires Global Warming Greenhouse Gas Landsat Thematic Mapper Mortality Oxidation Satellite Imagery Sustainable Development Vegetation Mapping Visual Analysis Biomass Carbon Deforestation Emission Fires Greenhouse Gases Image Analysis Satellites Acre [brazil] Amazonas Rondonia |
Data do documento: | 2013 |
Revista: | Forest Ecology and Management |
É parte de: | Volume 291, Pags. 199-208 |
Abstract: | Areas affected by forest fires that occurred in 2005 were mapped in the municipalities of Boca do Acre and Lábrea (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 865.6km2 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 Rondônia and Acre. The greatest loss of biomass due to the increase in tree mortality was indicated by the survey made 4years after the fires: 4.5×106Mg total (above+below-ground) and 3.7×106Mg (only above-ground). Consequently, 2.2×106MgC (total) and 1.8×106MgC (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. © 2012 Elsevier B.V. |
DOI: | 10.1016/j.foreco.2012.11.044 |
Aparece nas coleções: | Artigos |
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