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Efeito do fogo na fenologia de Syagrus glaucescens Glaz. ex Becc. (Arecaceae)

Deise Tatiane Bueno Miola,Henriqueta V.L. Correia,G. W. Fernandes,Daniel Negreiros

Published 2010 in Neotropical Biology and Conservation

ABSTRACT

EnglishAbstract Syagrus glaucescens is an endemic and threatened palm from the rupestrian field of the Espinhaco Range, Minas Gerais, southeastern Brazil. The objective of this study was to evaluate the fire effect on the vegetative and reproductive phenology of S. glaucescens. It was tested the hypothesis that the occurrence of fire can affect the phenological patterns exhibited by this species. The study began after six months of fire occurrence. A total of 40 individuals were marked and observed monthly, 20 in a burned area (Queimado group) and 20 in an unburned adjacent area (Controle group), located in rupestrian fields areas of Serra do Cipo (MG). The analysis of phenophases was performed using the index of activity and the Fournier’s percent index of intensity. Leaf flushing and leaf fall were synchronous among the individuals of the two populations, during the studied period. The production of flowers and fruits on S. glaucescens was asynchronous for the most part of the time. However, in both studied areas most individuals were blooming during the dry season and fruiting in the rainy season. Rainfall seems to be the main factor determining the observed phenological patterns, and was significantly correlated with some phenophases of both burned and control groups. The burned plants flowered and fruited before the control group, and also produced a higher number of flowers and fruits, suggesting that fire may affect the phenology of this palm. portuguesSyagrus glaucescens e uma palmeira de pequeno porte, ameacada de extincao e endemica dos campos rupestres da Cadeia do Espinhaco, em Minas Gerais. O presente estudo teve como objetivo avaliar o efeito do fogo na fenologia vegetativa e reprodutiva de S. glaucescens. Foi testada a hipotese de que a ocorrencia do fogo altera os ritmos fenologicos exibidos por esta especie. O estudo teve inicio seis meses apos a ocorrencia do fogo. Foram marcados e observados, mensalmente, 20 individuos na area queimada (grupo Queimado) e 20 em uma area de controle adjacente (grupo Controle), localizados em areas de campo rupestre da Serra do Cipo (MG). A analise das fenofases foi feita pelos metodos de indice de atividade e percentual de intensidade de Fournier. O brotamento e a senescencia foliar foram constantes e sincronicos entre os individuos das populacoes em praticamente todo o periodo estudado. A producao de flores e frutos em S. glaucescens foi assincronica na maior parte do tempo. Entretanto, de uma forma geral, nos dois grupos avaliados, pode-se observar maior percentual de individuos florescendo na estacao seca e frutificando na estacao chuvosa. A precipitacao parece ser o principal fator determinante na definicao dos padroes fenologicos, pois obteve correlacao significativa com varias fenofases em ambos os grupos, Controle e Queimado. O grupo Queimado floresceu e frutificou antes do grupo Controle, alem de ter produzido maior numero de flores e frutos, sugerindo que o fogo afeta a fenologia desta palmeira.

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