Composição florística da regeneração natural de espécies arbóreas ao longo de oito anosem um fragmento de floresta estacional semidecidual, em Viçosa, MG

A florística da regeneração natural foi estudada em 10 locais, com seis sub-parcelas em cada local, em 1992, 1995 e 2000, em fragmento de Floresta Estacional Semidecidual Montana, em Viçosa, MG. A amostragem da classe 1 de tamanho de planta (até 1 m de altura), classe 2 (1-3 m de altura) e classe 3 (>3 m de altura e 3m and DBH < 5cm). A total of 4,149 individuals were sampled over the inventory period, comprising 42 families and 160 species, being 11.7 % pioneer, 62.1 % early secondary, and 26.2 % late secondary species. Family number did not change and number of species increased with time. Fabaceae, Myrtaceae, Rubiaceae and Lauraceae were the predominant families. Species ingrowth was higher than mortality. Shannon-Weaver diversity index was significantly lower (P < 0.05) only for the plant size class 1 as compared to the other size classes, in 1992, and it increased significantly from 3.45 (average of all plant size classes), in 1992, to 3.67 and 3.64 in 1995 and 2000, respectively. The Pielou equability index per inventory date varied from 0.71 to 0.74, and it was 0.71; 0. 79 and 0.82 for the size classes 1, 2 and 3, respectively. Overall, the results showed that monitoring the natural regeneration over an age sequence is important to understand the dynamics of the secondary forest fragments