Estudo de incremento de 2ha de terra firme, com ênfase em sucessão.

Abstract

Studies regarding the dynamics of tropical humid forests are scarce and little studied, especially when it comes to succession and diametral increment; however it is known that studies in this area are of paramount importance for formulating models of management and forest exploitation, as well as drafting legislation regarding the cutting cycle and / or rotation of native forest species in natural habitat conditions. The results of studies of diametrical increment of forest species are based on studies of short time and with few species, thus a generalized study is necessary to clarify obscure points about the individual growth of native species and their relationships with other species on the same site. The present work refers to a study of diametric increment of forest species with DBH > 10 cm found in a 2.0 ha fragment of terra firme humid tropical forest in Belém (PA). Twenty 10m x 10m plots were installed in 1956, where all individuals > 10 cm dbh were identified, measured, and marked for subsequent measurements; the study had irregular data collection extending through 1992. During the thirty-six years of the study we observed uneven growth among species and between species; the average diametrical increment of surviving individuals from 1956 to 1992 was 0.15m and 15.669 m2 /ha. The observed disuniformity of growth was attributed to factors such as genetic variability, synecology and autoecology of the species.