Artigo

Pasture burning in Amazonia: Dynamics of residual biomass and the storage and release of aboveground carbon

Aboveground biomass in cattle pasture converted from tropical dense forest was studied both before and after reburning in Brazilian Amazonia. In a 7-year-old pasture studied in Apiaú, Roraima, the aboveground dry weight of biomass (live plus dead) exposed to burning consisted of 96.3 t ha-1 of origi...

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Autor principal: Barbosa, Reinaldo Imbrozio
Outros Autores: Fearnside, Philip Martin
Grau: Artigo
Idioma: English
Publicado em: Journal of Geophysical Research Atmospheres 2020
Assuntos:
Biomass
Burning
Carbon Emission
Carbon Storage
Pasture
Brazil, Roraima State, Apiau
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/19379
id oai:repositorio:1-19379
recordtype dspace
spelling oai:repositorio:1-19379 Pasture burning in Amazonia: Dynamics of residual biomass and the storage and release of aboveground carbon Barbosa, Reinaldo Imbrozio Fearnside, Philip Martin Biomass Burning Carbon Emission Carbon Storage Pasture Brazil, Roraima State, Apiau Aboveground biomass in cattle pasture converted from tropical dense forest was studied both before and after reburning in Brazilian Amazonia. In a 7-year-old pasture studied in Apiaú, Roraima, the aboveground dry weight of biomass (live plus dead) exposed to burning consisted of 96.3 t ha-1 of original forest remains, 6.2 t ha-1 of secondary successional vegetation (woody invaders in the pasture), and 8.0 t ha-1 of pasture grass (carbon contents 48.2%, 45.4%, and 42.2%, respectively). In terms of carbon, burning efficiencies for these three categories were 13.2%, 66.7% and 94.6%, respectively. Net charcoal formation was 0.35 t C ha-1 or 0.63% of the carbon exposed to the reburn, while the total accumulated since conversion (including the initial burn) is estimated at 2.3 t ha-1 (1.82% of the predeforestation aboveground biomass carbon stock). The dynamics of the original forest remains were represented in simulations that included parameters such as charcoal formation, burning efficiency and carbon concentration in different biomass components. Releases from initial burning of the cleared forest (44.0 t C ha-1) plus releases over the course of the succeeding decade through combustion (12.5 t C ha-1) and decay (51.5 t C ha-1) total 92% of the original forest biomass carbon (126 t C ha-1). Of biomass carbon remaining after the initial burn (84.3 t C ha-1), 76.0% is released: 61.1% through decay and 14.9% through combustion in reburns, while 1.2% is net conversion to charcoal in the reburns. These results indicate an amount of charcoal accumulation that is smaller than some carbon calculations have assumed, therefore suggesting a greater impact on global warming from conversion of forest to pasture. 2020-06-15T22:07:59Z 2020-06-15T22:07:59Z 1996 Artigo https://repositorio.inpa.gov.br/handle/1/19379 en Volume 101, Número 20, Pags. 25847-25857 Restrito Journal of Geophysical Research Atmospheres
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language English
topic Biomass
Burning
Carbon Emission
Carbon Storage
Pasture
Brazil, Roraima State, Apiau
spellingShingle Biomass
Burning
Carbon Emission
Carbon Storage
Pasture
Brazil, Roraima State, Apiau
Barbosa, Reinaldo Imbrozio
Pasture burning in Amazonia: Dynamics of residual biomass and the storage and release of aboveground carbon
topic_facet Biomass
Burning
Carbon Emission
Carbon Storage
Pasture
Brazil, Roraima State, Apiau
description Aboveground biomass in cattle pasture converted from tropical dense forest was studied both before and after reburning in Brazilian Amazonia. In a 7-year-old pasture studied in Apiaú, Roraima, the aboveground dry weight of biomass (live plus dead) exposed to burning consisted of 96.3 t ha-1 of original forest remains, 6.2 t ha-1 of secondary successional vegetation (woody invaders in the pasture), and 8.0 t ha-1 of pasture grass (carbon contents 48.2%, 45.4%, and 42.2%, respectively). In terms of carbon, burning efficiencies for these three categories were 13.2%, 66.7% and 94.6%, respectively. Net charcoal formation was 0.35 t C ha-1 or 0.63% of the carbon exposed to the reburn, while the total accumulated since conversion (including the initial burn) is estimated at 2.3 t ha-1 (1.82% of the predeforestation aboveground biomass carbon stock). The dynamics of the original forest remains were represented in simulations that included parameters such as charcoal formation, burning efficiency and carbon concentration in different biomass components. Releases from initial burning of the cleared forest (44.0 t C ha-1) plus releases over the course of the succeeding decade through combustion (12.5 t C ha-1) and decay (51.5 t C ha-1) total 92% of the original forest biomass carbon (126 t C ha-1). Of biomass carbon remaining after the initial burn (84.3 t C ha-1), 76.0% is released: 61.1% through decay and 14.9% through combustion in reburns, while 1.2% is net conversion to charcoal in the reburns. These results indicate an amount of charcoal accumulation that is smaller than some carbon calculations have assumed, therefore suggesting a greater impact on global warming from conversion of forest to pasture.
format Artigo
author Barbosa, Reinaldo Imbrozio
author2 Fearnside, Philip Martin
author2Str Fearnside, Philip Martin
title Pasture burning in Amazonia: Dynamics of residual biomass and the storage and release of aboveground carbon
title_short Pasture burning in Amazonia: Dynamics of residual biomass and the storage and release of aboveground carbon
title_full Pasture burning in Amazonia: Dynamics of residual biomass and the storage and release of aboveground carbon
title_fullStr Pasture burning in Amazonia: Dynamics of residual biomass and the storage and release of aboveground carbon
title_full_unstemmed Pasture burning in Amazonia: Dynamics of residual biomass and the storage and release of aboveground carbon
title_sort pasture burning in amazonia: dynamics of residual biomass and the storage and release of aboveground carbon
publisher Journal of Geophysical Research Atmospheres
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/19379
_version_ 1787143200251576320
score 11.755432

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