Propagação vegetativa de especies arboreas a partir de raizes gemiferas : representatividade na estrutura fitossociologica e descrição dos padrões de rebrota de uma comunidade florestal, Campinas, São Paulo

AUTOR(ES)
DATA DE PUBLICAÇÃO

1998

RESUMO

There are little informations about the sprouting of tree species from root buds in Tropical Forests, but its occurrence is associated to events of disturbance. In 0,5ha of a Semidecidous Mesophytic Forest area that has been ofien burnt in Campinas, São Paulo, Brazil (Fazenda Santa Elisa - 22° 54 S; 47° 05 W), it was accomplished the phytossociological study including trees upper 5,Ocm OBH (diameter at breast height). At the same area it was also identified the tree species which sprouted from root buds, arguing about the importance of this kind of vegetative propagation in the structure of the community at the sampled area, besides to description and comparison among the species: the number of shoots, the morphological and physical conditions of the principal trunks, the occurrence of sprouting from root buds in the another Semidecidous Mesophytic Forest area that has not been burned, the growing and the death of shoots one year later and their spatial occupation. The individuals which sprouted from root buds were found through excavation and exposition of their roots and the identification of attachments between shoots and principal trunks. In the phytossociological study it was sampled 422 trees, belonging to 85 species, 73 genera and 38 families. Leguminosae, Euphorbiaceae, Rutaceae and Meliaceae were the richest families. It was identified 10 species (from 4 families) which sprouted from root buds, arising an amount of 150 shoots, the majority from Machaeríum stípítatum and Centrolobíum tomentosum (79 and 40 shoots, respectively). The median of the diameter of principal trunk at the ground levei was 15,28cm, the median of the depth of root at the point of shoot arising was 3,Ocm, the median of the root diameter at the point of shoot arising was 2,7cm, and the median of the distance between shoots and the principal trunk was 0,45m. In the forest area that has not been burnt it was not found trees of those 10 species which sprouted from root buds. One year later there were 92 alive shoots, but it was verified na increase of mean diameter and a mean height from the amount of alive shoots (O,66cm + 1 ,56cm of mean diameter and 0,55m + 0,39m of mean height). The sprouting from Machaeríum stípítatum and Centrolobíum tomentosum established an aggregated of spatial distribution pattern to both species in the considered area

ASSUNTO(S)

florestas tropicais fogo

ACESSO AO ARTIGO

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