Análise florística e estrutural de sistemas silviagrícolas em Tomé-Açu, Pará

Abstract

The objective of this work was to analyze the structural and floristic composition of agroforestry systems in Tomé-Açu, Pará, Brazil. Dendrometric data were obtained through an inventory of 40 sampling plots, with three sampling units each, comprising 120 sampling units with 10x10 m each. The average of 1,424.3 individuals per hectare belonging to 27 families and 54 species was inventoried. Considering the variability of vegetative stages, the different agroforestry systems (SAF) were divided into four hierarchical classes: SAF 1, SAF 2, SAF 3, and SAF 4, to set an classification system which can be used in other field evaluations and in digital classifications developed by means of remote sensing. Species observed in other agroforestry systems in the Amazon region were also relevant to this work, specially Theobroma cacao, Theobroma grandiflorum and Euterpe oleracea which, together, showed averages of 51% relative frequency, 69.2% relative density, 50.1% relative dominance, and 56.8% importance value index. The average data of the floristic diversity, abundance, basal area, and importance value index indicate that the agroforestry systems in the Tomé-Açu region are production systems with economic and environmental potential, if appropriate and rational management is adopted.