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Braz. j. biol ; 63(1): 47-60, Feb. 2003. ilus, mapas, tab, graf
Artigo em Inglês | LILACS | ID: lil-343394

RESUMO

Mortality and recruitment rates were obtained for tree species over a 5.6 year period in a 1-ha fragment of secondary montane rain forest in Southeastern Brazil. All plants with a diameter at breast height (dbh) > 8 cm were sampled in 1989-1990 and 1995. There was an increase from 90 to 96 species, and 669 ind./ha to 749 ind./ha over the period. The mortality rate of 1.67 percent/yr was similar to findings for other forests, while recruitment of 3.46 percent/yr was the highest rate reported. Both mortality and recruitment were significantly higher in the smaller dbh classes. Recruitment was higher among rare species, and the relatively slow-growing species had significantly higher mortality rates. Differences between species dynamics were marked. Species with high values of l were mainly early successional and understorey trees but some understorey species also suffered a marked population decline. The classification system of species in response to light which divides understorey species into "partial shade-bearers" and "shade-bearers" groups showed to be the most suitable to the obtained results. The results suggest that this forest is undergoing a process of recovery from past disturbance


Assuntos
Ecologia , Árvores , Clima Tropical , Brasil , Densidade Demográfica , Especificidade da Espécie
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