Use este identificador para citar ou linkar para este item:
https://repositorio.inpa.gov.br/handle/1/18665
Registro completo de metadados
Campo DC | Valor | Idioma |
---|---|---|
dc.contributor.author | Fearnside, Philip Martin | - |
dc.contributor.author | Barbosa, Reinaldo Imbrozio | - |
dc.contributor.author | Graça, Paulo Maurício Lima Alencastro de | - |
dc.date.accessioned | 2020-06-15T22:02:28Z | - |
dc.date.available | 2020-06-15T22:02:28Z | - |
dc.date.issued | 2007 | - |
dc.identifier.uri | https://repositorio.inpa.gov.br/handle/1/18665 | - |
dc.description.abstract | In a burn of 5-year-old secondary forest cleared for agriculture in Roraima, Brazil, carbon partitioning was measured for above-ground portions of both secondary forest (regrowth) and the remains of original forest, felled and burned six years previously. Above-ground dry weight biomass averaged 43.0 ± 6.5 Mg (megagrams = metric tons) per hectare (Mg ha-1) for secondary forest and 105.8 ± 23.7 Mg ha-1 for original forest remains. Pre- and post-burn above-ground biomass loadings were estimated by cutting and weighing six 60-m2 plots and by line-intersect sampling (LIS) done along the axis of each post-burn plot (three transects), plus two supplementary LIS transects. High variability of initial biomass made LIS more reliable for assessing change in material >10 cm in diameter; quantities for diameter classes <10 cm relied on direct weighing. Above-ground carbon pools were reduced by 67.8% in secondary forest and 32.0% in original forest remains. Burning released 28.8 Mg C ha-1 (original forest remains plus secondary forest biomass), or 41.6% of the pre-burn total carbon stock in biomass. The remainder of the carbon either remained as residual biomass (39.2 Mg C ha-1 or 56.5% of pre-burn C) or as charcoal and ashes (1.4 Mg C ha-1 or 2.0%). Carbon stock in charcoal increased from 0.50 Mg C ha-1 to 1.07 Mg C ha-1, a net gain of 0.57 Mg C ha-1, or 0.8% of the pre-burn above-ground carbon stock. The net gain of charcoal carbon was composed of 0.21 Mg C ha-1 from secondary forest biomass and 0.36 Mg C ha-1 from original forest remains; 1.1% of the above-ground secondary forest carbon was converted to charcoal, while the corresponding percentage for original forest remains was 0.7%. Ashes contained an additional 0.29 Mg C ha-1, of which 0.11 Mg C ha-1 can be attributed to secondary forest biomass and 0.18 Mg C ha-1 to original forest remains. If the carbon in ashes is assumed to be finely powdered charcoal, this stock adds 0.21% to the charcoal formation percentage for secondary forest and 0.36% to that for original forest remains. The overall charcoal-formation percentage was 1.6%, or 2.0% if ashes are included. Charcoal-formation percentages in this study are lower than those sometimes assumed in global carbon models; nevertheless, charcoal can represent an important sink of atmospheric carbon over long time scales. © 2007 Elsevier B.V. All rights reserved. | en |
dc.language.iso | en | pt_BR |
dc.relation.ispartof | Volume 242, Número 2-3, Pags. 678-687 | pt_BR |
dc.rights | Restrito | * |
dc.subject | Biomass | en |
dc.subject | Carbon Dioxide | en |
dc.subject | Charcoal | en |
dc.subject | Combustion | en |
dc.subject | Global Warming | en |
dc.subject | Greenhouse Gases | en |
dc.subject | Carbon Partitioning | en |
dc.subject | Carbon Pools | en |
dc.subject | Time-scale | en |
dc.subject | Deforestation | en |
dc.subject | Aboveground Biomass | en |
dc.subject | Biomass Allocation | en |
dc.subject | Biomass-burning | en |
dc.subject | Carbon Dioxide | en |
dc.subject | Carbon Sink | en |
dc.subject | Charcoal | en |
dc.subject | Deforestation | en |
dc.subject | Global Warming | en |
dc.subject | Greenhouse Gas | en |
dc.subject | Secondary Forest | en |
dc.subject | Biomass | en |
dc.subject | Charcoal | en |
dc.subject | Combustion | en |
dc.subject | Deforestation | en |
dc.subject | Greenhouse Gases | en |
dc.subject | Secondary Forest | en |
dc.subject | Amazonia | en |
dc.subject | Apiau | en |
dc.subject | Roraima | en |
dc.subject | South America | en |
dc.title | Burning of secondary forest in Amazonia: Biomass, burning efficiency and charcoal formation during land preparation for agriculture in Apiaú, Roraima, Brazil | en |
dc.type | Artigo | pt_BR |
dc.identifier.doi | 10.1016/j.foreco.2007.02.002 | - |
dc.publisher.journal | Forest Ecology and Management | pt_BR |
Aparece nas coleções: | Artigos |
Arquivos associados a este item:
Não existem arquivos associados a este item.
Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.