Dinâmica da comunidade arbórea em uma floresta estacional semidecidual sob queimadas recorrentes

• Autor(a) principal: PEIXOTO, Karine da Silva
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tde/2551
• topic: distúrbios; incêndios florestais; mortalidade; disturbances; forest fires; mortality; CNPQ::CIENCIAS BIOLOGICAS::ECOLOGIA

The effects of fire on tree mortality can change the floristic and structure of forest depending on intensity, frequencies and duration of burnt. Besides should play a fundamental role in vegetation dynamics. Areas of semideciduous forest subject to different frequencies of fire were monitored: 0.9 ha burned in 2007 (Q1) and 0.9 ha in 2005 and 2007 (Q2). The dynamics was based the average interval of 2.03 years between T1 (outubro/2006-maio/2007) and T2 (March/2009), including individuals with PAP ≥ 15 cm. Diversity (H ) and species richness (estimated by Jackknife) were higher in Q2, both at T1 and T2. The decrease on tree density between surveys was significant for Q1 and Q2. The proportion of deaths was higher in Q1. With exception of change (based number of individuals) that was higher in Q1, there were no differences in the dynamic parameters between Q1 and Q2 considering both the number of individuals and basal area. The increase of diversity in Q2 may be partially explained by the hypothesis of intermediate disturbance. On the other hand, despite the recruitment and mortality did not differ between Q1 and Q2, the high turnover rates independent of fire frequency suggests future changes in forest if the fire continuing frequent in the area.