Physiochiology and growth dynamics in a seasonal seasonal forest fragment

The purpose of this study was to characterize the floristic structure and to evaluate the dynamics of a fragment of the Semideciduous Seasonal Forest formation in Sao Jose das Palmeiras, PR. The data come from a continuous forest inventory, with an area of 5000 m(2), divided into 50 sub-units of 10 x 10 m (100 m(2)). All trees with a breast height diameter greater than 5 cm were included in the data collection. A total of 787 arboreal individuals, distributed in 32 families, 54 genera, and 61 species were recorded, and the families with the greatest wealth were Fabaceae (27.57%), Euphorbiaceae (8.20%), Meliaceae (6.56%), Myrtaceae (6.56%) and Sapindaceae (6.56%). The diametrical distribution showed a decreasing tendency, "J" inverted, decreasing the number of individuals with increasing diameter classes, the basal area found was 16.66 m(2) ha(-1). In the floristic aspect, the fragment presented a considerable species richness, indicating to be a well conserved formation. The unit was monitored between 2007 and 2011, and achieved a 6.7% admission rate, being lower than the mortality rate with 21.5%, mainly in the first diametric class. The annual periodic increment (IPA) was 0.28 cm year(-1), and the diameter class interval between 35 and 50 cm was the one that presented the largest increments. It is a young forest, in full succession stage, the parameter of dominance has low value, and also to the parameter of density, are affected by only a few species. The values obtained for the density and dominance of the forest remnant, added to the exploration history allow to verify that it is a forest in altered primary succession.