LAUSR

ABSTRACT Changes in floristic composition, phytosociological structure and dynamic processes like ingrowth, mortality and diameter increment were studied between 2007 and 2009 in all trees with DBH ≥ 5 cm in a fragment of Montane Araucaria Forest in Boa Ventura do Sao Roque, Parana, Brazil. The analyses showed the occurrence 2596 ind.ha-1, 25 families, 40 genera and 45 species, while in the survey conducted in 2009, 2558 indivuals.ha-1, 27 families, 41 genera and 47 species were registered, with Matayba elaeagnoides Radlk. being the most important species in both surveys. The forest fragment showed a mortality rate of 0.41% per year and recruitment of 1.75% per year. This indicates that the dynamics take place in a gradual manner, with a mean annual increment (MAI) of 0.328 cm.year-1. Based on the evaluated parameters, it follows that the fragment is in process of regeneration. Keywords: araucaria forest, growth, phytosociology. 1. INTRODUCAO A Floresta Ombrofila Mista (FOM), ou Floresta com Araucaria, e uma unidade fitoecologica pertencente ao dominio do Bioma Mata Atlântica que ocupava originalmente uma area de cerca de 175 mil km