Título:	Efeito a longo prazo de queimadas prescritas na estrutura da comunidade de lenhosas da vegetação do cerrado sensu stricto
Autor(es):	Sato, Margarete Naomi
Orientador(es):	Miranda, Heloisa Sinátora
Assunto:	Queimada - Cerrados Manejo florestal Reserva Ecológica do IBGE Plantas lenhosas Biomassa florestal
Data de publicação:	20-Mai-2020
Data de defesa:	Abr-2003
Referência:	SATO, Margarete Naomi. Efeito a longo prazo de queimadas prescritas na estrutura da comunidade de lenhosas da vegetação do cerrado sensu stricto. 2003. vii, 84 f., il. Tese (Doutorado em Ecologia)—Universidade de Brasília, Brasília, 2003.
Abstract:	The work was carried out at the Reserva Ecológica do 1BGE (35 km south of Brasilia) to investigate the effects of different fire regimes on the structure of the woody vegetation of the cerrado sensu stricto. The experimental plots were protected from fire for 18 years and submitted to prescribed fires every two years since 1992 at the beginning (June), middle (August) and end (September) of the dry season. Three plots of 10 ha (500 m x 200 m) were selected. Inside each plot five 50 m x 20 m subplots were marked for permanent inventory. All woody individuals with diameter equal or greater than 5 cm at 30 cm from the soil surface were included in the inventory. After each fire, all the tagged trees were inventoried and the damage recorded. The damage was classified as partial, presenting aerial resprout or with top kill, or total, with the death of the tree or shrub. Before the prescribed fires of 1992, there were 1114, 1144 and 1031 live individuals and 63, 61 and 52 dead individuals in the early, mid and late dry season. After the five fires, in 2002, there were 683, 629 and 580 live individuals and 49, 67 and 72 dead individuals, resulting in a mortality of 39%, 45% and 44%. Considering the mortality and top kill, the reduction in the number of stems was 44%, 59% and 75%. Although the percentage of dead individuals was high, 240 new individuals belonging to 38 species were added, after the five prescribed fires, to the inventory in the early dry season plot, 74 ( 19 species) in the August area and 30 individuals (13 species) in the September area. The total aboveground biomass before the fires there was estimated to be 26,5 t/ha in the June area, 25,7 t/ha and 25,6 t/ha in the August and September areas. The woody vegetation contributed with 58%, 66% and 75% of the total aboveground biomass. After the fires, in 2002, the total aboveground biomass was reduced to 22,2 t/ha n the June area, 17,5 t/ha and 17,2 t/ha in the August and September plots representing a reduction of 16%, 32% and 33%. The average carbon stock was 11 t C/ha with 6,9 t C/ha, 7,6 t C/ha e 8,6 t C/ha stocked in the woody vegetation in the June, August and September areas. After the fires a reduction of 1,8 t/ha in the carbon stock was estimated for the June area, 3,8 t C/ha and 4,1 t C/ha in the August and September areas. In the June area the woody vegetation contributed with 33% of the carbon loss and 75% in the August area. In the September area there was a loss of 4,7 t C/ha from the woody vegetation and an increase of 0,6 t C/ha in the carbon stock o f the herbaceous vegetation. Thus the effects of biennial fires on the structure of the woody vegetation of the cerrado sensu stricto depend on the time when it occurs during the dry season. The less damaging prescribed fires were the ones at the beginning of the dry season, when natural fires are common in this region.
Unidade Acadêmica:	Instituto de Ciências Biológicas (IB)
Informações adicionais:	Tese (doutorado)—Universidade de Brasília, Instituto de Ciências Biológicas, Programa de Pós-Graduação em Ecologia, 2003.
Programa de pós-graduação:	Programa de Pós-Graduação em Ecologia
Agência financiadora:	Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).
Aparece nas coleções:	Teses, dissertações e produtos pós-doutorado

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