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Título: | Biomass burning in Brazil's Amazonian "arc of deforestation": Burning efficiency and charcoal formation in a fire after mechanized clearing at Feliz Natal, Mato Grosso |
Autor: | Righi, Ciro Abbud Graça, Paulo Maurício Lima Alencastro de Cerri, Carlos C. Feigl, Brigitte Josefine Fearnside, Philip Martin |
Palavras-chave: | Amazon Forests Amazon Region Amazonian Forests Before And After Biomass-burning Burning Carbon Content Carbon Stocks Concentration Of Diameter Class Direct Measurement Dry Biomass Dry Seasons Field Measurement Forest Types Greenhouse-gas Emissions High Variability Key Parameters Low Humidity Mato Grosso Parameters Estimated Rainforest Rapid Deforestation Semi-deciduous Trace-gases Tropical Forest Biomass Cavity Resonators Charcoal Deforestation Drought Global Warming Greenhouses Leakage (fluid) Parameter Estimation Uncertainty Analysis Gas Emissions Biomass-burning Carbon Emission Charcoal Deforestation Dry Matter Dry Season Forest Clearance Forest Fires Forest Resource Global Warming Greenhouse Gas Humidity Rainforest Sampling Tropical Forest Biomass Carbon Charcoal Combustion Deforestation Drought Emission Fires Greenhouse Gases Greenhouses Leakage Amazonia Mato Grosso South America |
Data do documento: | 2009 |
Revista: | Forest Ecology and Management |
É parte de: | Volume 258, Número 11, Pags. 2535-2546 |
Abstract: | Estimates of greenhouse-gas emissions from deforestation are highly uncertain because of high variability in key parameters and because of the limited number of studies providing field measurements of these parameters. One such parameter is burning efficiency, which determines how much of the original forest's aboveground carbon stock will be released in the burn, as well as how much will later be released by decay and how much will remain as charcoal. In this paper we examined the fate of biomass from a semideciduous tropical forest in the "arc of deforestation," where clearing activity is concentrated along the southern edge of the Amazon forest. We estimated carbon content, charcoal formation and burning efficiency by direct measurements (cutting and weighing) and by line-intersect sampling (LIS) done along the axis of each plot before and after burning of felled vegetation. The total aboveground dry biomass found here (219.3 Mg ha-1) is lower than the values found in studies that have been done in other parts of the Amazon region. Values for burning efficiency (65%) and charcoal formation (6.0%, or 5.98 Mg C ha-1) were much higher than those found in past studies in tropical areas. The percentage of trunk biomass lost in burning (49%) was substantially higher than has been found in previous studies. This difference may be explained by the concentration of more stems in the smaller diameter classes and the low humidity of the fuel (the dry season was unusually long in 2007, the year of the burn). This study provides the first measurements of forest burning parameters for a group of forest types that is now undergoing rapid deforestation. The burning parameters estimated here indicate substantially higher burning efficiency than has been found in other Amazonian forest types. Quantification of burning efficiency is critical to estimates of trace-gas emissions from deforestation. © 2009 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.foreco.2009.09.010 |
Aparece nas coleções: | Artigos |
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