This study has been carried out to define total bulk volume equations for Eucalyptus dunni Maiden, 6.5 years old, lined up along a 3 by 2 meter-spaced planted setting. These equations were supposed to both trees with and without bark. Eighty trees were cubed by Smalian's method distributed according to diameter classes and following a proportional way, over four forest sites. Equations were determinated through stepwise regression procedure, following an independent process for each site. A second step was evaluate the possiblility of these equations to be reduced into a single one. The covariance analysis applied to data showed the possibility of using an unique one equation to estimate the tree bulk volume to the region. Two equations were selected: one to calculate the total volume of trees with bark and another to determine the commercial volume without bark. The equation tom determine total volume was equal to: log v = -9.06566 + 0.93016 . log(d²h) and the equation to determine comercial volume was equal to: log v = -14.14078 + 1.39608 . log(d²h). Besides, no differences in the trunk shape and, consequently, in the bulk volume of trees in the four sites studied were observed.
regression; volume; Eucalyptus dunnii
