Evaluación de volumen real en suelos de prioridad forestal de Eucalyptus grandis W.Hill ex Maiden, Eucalyptus dunnii Maiden, Eucalyptus smithii R.T.Baker y Eucalyptus benthamii Maiden & Cambage

The objective of this work was to calculate the real volume and shape factor of different species of Eucalyptus, through different cubing methods such as Smalian, Huber, Newton and Hohenadl and to make the respective comparison. The volume calculation was carried out from measurements of a series of dendrometric variables of interest such as total height, diameter at breast height and diameter at different heights, in a trial of 15-year-old Eucalyptus trees, constitute of four species: E. grandis, E. benthamii, E. dunnii and E. smithii of seminal origin, in the department of Tacuarembó, Uruguay. The data was obtained through field measurement from a sample of individuals of the entire trial. This data was obtained by cutting and cubing the previously selected individuals from diameter classes generated for each species. The data analysis was carried out using the R statistical software, in its RStudio interface, through the adjustment of linear models, analysis of variance, comparison of means by Tukey and residual analysis. Regarding the actual individual volumes with bark, for E. grandis statistically significant differences were obtained (p-value of 1.29e-06) with respect to the other species presenting the largest volume, with 1,821 m3 per tree. For the volume without bark, it is observed that E. grandis differed significantly (p-value 1.4e-06) from the rest by presenting the highest value for the variable with 1.6817 m3 per tree, while E. smithii presented the lowest value 0.8530 m3 per tree. In relation to the form factor with bark, there were significant differences between all species 0.52; 0.48; 0.43 and 0.41 for E. grandis, E. benthamii, E. smithii and E. dunnii respectively, (p-value of 2.5e-10). For the form factor without bark, it was observed that there were significant differences between E. grandis and the other species (p-value of 6.83e-11), with this species presenting the highest value 0.5203 and E. smithii being the species that presented the lowest value for said variable 0.4639. In relation to the estimation by the methods, for the volume without crust, there were significant differences between the Hohendahl and Huber methods but not between them with Smalian and Newton, while in the estimation of volume with bark, there were no differences between them.