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

Abstract

All issues related to tropical rainforests that involve biological and ecological aspects present obscure points that require basic research in order to make the most of the resources that tropical forests offer without breaking the specialized and complex dynamic equilibrium of these vegetation formations. With the objective of providing subsidies to the understanding of the dynamic behavior of humid tropical forests (diameter increment and succession) a study of permanent plots was installed in 2ha of dryland native forest in the suburbs of Belém (PA), where 1° collections of floristic dendrometric data (CAP30cm) were made over a period of 36 years (1956 to 1992) under the coordination of Dr. João Murça Pires. As for the floristic composition, variation was observed mainly in the species considered as characteristic of the study area, as well as certain species ceased to occur and others began to occur in the study area. No variation was observed in terms of horizontal distribution. The plant mortality study estimated a time of 70.07 years for all trees in the study area to be dead. A total of 485 (51.37%) deaths were recorded, the dead plants had an average DBH of 0.26m and a basal area of 20.32m2 /ha. The mortality by species was very irregular. Through the recruitment study we were able to detect certain intermediate species (short life span), which are of extreme importance to the nature conservation program or the formation of botanical gardens; as noted in the mortality, recruitment by species was also irregular (CNPq/MPEG)