Riqueza de espécies de sub-bosque de um fragmento de Floresta Ombrófila Mista em Tijucas do Sul, PR

Abstract

This study was done in a 6 ha fragment of Mixed Ombrophilous Forest in the county of Tijucas do Sul, - Paraná. Its aim was the elaboration of a sub-canopy species catalog and evaluation of the perturbation of anthropic impacts on the composition of this forest stratum. Collection of botanical material was conducted monthly from October 2001 until September 2002. Two sample units of 100 x 100 m. Were usid and 89 species, 54 genera distributed into 32 botanical families were identified, belonging to 84 species in area A (shrub) and 27 species in area B (forest). In the shrub area the most representative families were Solanaceae, with 16 species, Asteraceae (15) and Melastomataceae (14). In the forest area the most frequent families were Melastomataceae with 6 species, Solanaceae (5) and Myrtaceae (5). The predominance of species from Solanaceae and Asteraceae in the shrub area demonstrates the pioneer character of these families, playing an important role in the re-establishment of this forest. Species of the Solanaceae family in the forest were most abundant along the footpaths inside the forest. The data showed that for this fragment, regeneration is successfully taking place and the continuation of this process includes restricted access to the area.