The growth and selection of equations for four native forest species was studied aiming to identify promising species for homogeneous stands, and agroflorestry systems in the Roraima state. The growth of andiroba (Carapa guianensis Aubl.), castanha-do-brasil (Bertholletia excelsa Bonpl.), ipê-roxo (Tabebuia avellanedae Lorentz ex Griseb) and jatobá (Hymenaea courbaril L.) to the seven years of age, revealed to be promising, reaching mean annual increments in merchantable volume of 6.3; 14.6; 6.0 and 2.3 m³.ha-1 year-1, respectively. Regarding diameter growth, all the species presented mean annual increments over than 1 cm, being higher than the observed ones for trees growing in natural forests. The statistical analyses indicated the hypsometric Prodan equation as of better adjustment for the analyzed species. However, the graphical analysis indicated that the shape of the h/d curve varied with the species. The fit of merchantable volume and commercial form factor equations demonstrated to be necessarily different equations for each species. The graphical analysis of the merchantable volume and form factor curves showed that the species differed in both the parameters, indicating that the use of an average form factor for all the species must be avoided.
Brazil; Amazônia; merchantable volume; form factor
