The present research was established with the purpose of studying form factors of Pinus elliottii Engelm for the region of Serra do Sudeste, Rio Grande do Sul. Thus, the development of artificial form factors in function of dendrometrical variables were studied. Furthermore tables of form factors for regional use were established. Of the tested models, the model that best adjusted the dependent variable can be expressed as follows: <IMG SRC="/img/revistas/cr/v31n1/a06img01.gif"> being: d= diameter at breast height, d0,5 and d0,3=diameters of Hohenadl, with a coefficient of determination of 0.89 and a coefficient of variation of 3.59%. The relative diameters of Hohenald of the equation of form factor were estimated through the equations: ln(d0.5) = -0.27211 + 0.97542 * ln(d) and ln(d0.3) = -0.62082 + 0.26949 * ln(d2) + 0.22483 * ln(d*h), showing a coefficient of determination of 0.91 and 0.99 and a coefficient of variation of 4.23 and 8.21%, respectively.
form factors; Equation of form factors; Pinus elliottii
