Fitossociologia em ambiente de borda de fragmento de floresta estacional semidecidual

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

29/05/2009

RESUMO

The following work was perfomed in a fragment of a seasonal semidecidual forest in Floresta Nacional de Pacotuba, located in Cachoeiro de Itapemirim, Espírito Santo. In the whole, 39 parcels of fixed area were delimited being 27 (10 x 30 meters) located on the edge and 12 (40 x 50 meters) inside the fragment. In order to get further information concerning communities located around and inside the florest fragment, all individuals with a diameter of equal or bigger than 5 cm above 1,30 m the soil, were sampled. Here are the main sampling results: 167 species were found on the edge and 314 inside, being 73 exclusive on the edge and 220 out of the 46 families sampled, the families Fabaceae (33), Myrtaceae (10), Moraceae and Sapindaceae (8) and the genus Trichilia, with 6 species, are the best represented in this area. On the other hand, of the 54 families sampled in the inner, the families Fabaceae (52), Myrtaceae (21) and Sapotaceae (17) and the genus Ocotea, containing 11 species, are the ones that stand out. The diversity rate of Shannon and equability of Pielou to the edge, are respectively 4,06 and 0,79 to the edge and 3,25 and 0,56 to the inner. The species Pseudopiptadenia contorta, Astronium graveolens, Astronium concinnum and Senefeldera verticillata, Actinostemon estrellensis, Anadenanthera peregrina show bigger rate of importance value (IVI%), respectively on the edge and inside the fragment. Both the edge and the inner have a pattern of diametric structure with a shape of inverted J". The vertical structure shows individuals varying from 2 to 49 meters in the edge and 2 to 55 meters in the inner. The analisis of floristic similarity, based on the rate of Sorensen, revealed a remarkable distinction between the species in the edge and inside the fragment, being possible also identify similar subgroup both on the edge and inside the area of the fragment. The species of initial succession compose the edge of the fragment, whereas in the inner are the late secundary. The micrometeorological parameters analised are different between the edge and the inner of the forest fragment

ASSUNTO(S)

mata atlântica floresta estacional semidecidual efeito de borda composição florística atlantic forest seasonal semidecidual forest edge effect floristic composition conservacao da natureza

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