Phytosociology of tree component from a floodplain forest fragment, at Guarapuava, Paraná

Abstract

This study is part of a research involving a Foodplain Forest fragment of rio das Mortes (rio das Pedras basin), municipality of Guarapuava (OLIVEIRA-LIMA, 2009) and analyze floristic composition and phytosociological structure of the arboreal component of the community. Within thirty-three 10 x 20 m contiguous plots it was evaluated (in relation to botanical species, Diameter at Base Height (DBH) and total height) 1047 individuals with DBH ≥ 5 cm. Among the 39 found species, the most important, accordingly to the parameter of importance value, was Sebastiania commersoniana (Baill.) L. B. Sm. & Dows (branquilho), which reached the highest density and frequency values. However, the largest species are represented by Araucaria angustifolia (Bertol) Kuntze (Paraná - pine) which can be explained by its higher value of dominance (14.87 m2 .ha-1). The Shannon-Weaver diversity index value was 2.2 nat/ind and the equability index of Pielou was 0.6. The total density stimated was 1,586.36 individuals. ha-1 and the medium DBH and height was 12.79 cm and 7.25 m, respectively.