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Este estudo avaliou a estrutura e diversidade da comunidade arborea da Floresta Estacional Semidecidual secundaria no Jardim Botânico da UFJF (Juiz de Fora, MG). As arvores (DAP ≥ 5 cm) foram amostradas em 25 parcelas aleatorias de 20 × 20 m. Foram amostrados 2.535 individuos, sendo 385 mortos em pe e 2.150 individuos vivos, pertencentes a 105 especies e 39 familias. Como reflexo da forte dominância ecologica, o valor do indice de diversidade de especies de Shannon (H’ = 3,30 nats.ind -1 ) foi baixo em comparacao com florestas mais maduras da regiao. As arvores mortas em pe representaram 15,2% do total de individuos, valor elevado quando comparado com outras florestas da regiao. Uma analise de correspondencia distendida (DCA) mostrou baixa heterogeneidade floristica interna. Houve predominância de arvores pertencentes a estagios sucessionais iniciais (pioneiras e secundarias iniciais). Os resultados demonstram que, embora o fragmento florestal possua tempo de regeneracao natural superior a 70 anos, a comunidade arborea apresenta um processo de sucessao aparentemente lento, caracteristica de uma floresta imatura. Em contrapartida, a area possui especies ameacadas de extincao e familias caracteristicas de floresta madura (Lauraceae e Myrtaceae) com boa representatividade. Assim, o fragmento e importante para a preservacao da biodiversidade regional. Tree structure and diversity in a secondary Semideciduous Seasonal Forest in the Juiz de Fora Federal University Botanical Garden Abstract This study aimed to evaluate the structure and diversity of the tree community in a secondary semidecidous forest at UFJF Botanical Garden (Juiz de Fora, Minas Gerais, Brazil). The trees (dbh ≥ 5 cm) were sampled at 25 random plots of 20 m × 20 m. A total of 2535 individuals were sampled, 385 standing dead and 2150 life, belonging to 105 species and 39 families. As a reflection of strong ecological dominance, the index value of species diversity (Shannon H ’ = 3.30 nats.ind -1 ) was low compared to secondary forests of the region. The standing dead trees represent 15.2% of individuals, a high proportion compared to secondary forests. Detrended correspondence analysis (DCA) resulted in short gradients, showing a low internal species heterogeneity. There was a strong predominance of species of early succession stages (pioneer and early secondary). The results show that, although the forest has undergone over 70 years of natural regeneration, the tree community presents a slow succession process, with low diversity and characteristics of an immature forest. In contrast, the area has endangered species and some families typical of mature forest (Lauraceae and Myrtaceae). In other words, the fragment is important for the preservation of regional biodiversity.

Estrutura e diversidade arbórea da Floresta Estacional Semidecidual secundária no Jardim Botânico da Universidade Federal de Juiz de Fora