CARACTERIZAÇÃO DA VEGETAÇÃO PIONEIRA DE UMA ÁREA DE EXPLORAÇÃO DE MIMOSA SCABRELLA BENTH. (BRACATINGA), NO MUNICÍPIO DE COLOMBO, PR

To better understand the successional dynamics of "bracatinga" forests, a floristical and fitossociological survey was performed after 60 days after the cutting of the bracatinga (Mimosa scabrella Benth.) in an agroforestry system area (bracatinga + corn, beans and pumpkin), in the municipality of Colombo, PR. Thirty plots of 1 m² were delimited, using the method of Braun- Blanket. Frequency and relative covering were defined for each plant species. Thirty-two species (13 herbaceous and 19 tree species) were detected. The herbaceous species with most frequent and larger value of coverage are: Panicum sabulorum, Cyperus hermaphroditus and Imperata brasiliensis. Among the tree species, the one with greater values are: Leandra australis and Palicourea sp. Sprouting was frequent for several tree species, sugesting that, even after several cycles of explotation, regeneration of many species of the original forest still occurs. Key-words: pioneer species, floristics, phytossociology, agroforestry system.