Mixed volumetric models in clones of Eucalyptus in the gypsum pole of Araripe, Pernambuco
DOI:
https://doi.org/10.5380/rf.v45i3.36844Keywords:
Forest inventory, volumetric estimation, comparing models.Abstract
Abstract
The present research aimed to estimate the volume of Eucalyptus clones using mixed models. The database was derived from an experiment of Eucalyptus clones, located in the Chapada do Araripe, semiarid of the Pernambuco State. 89 trees were cubed by the method Smalian at the age of seven and a half years. The model of Schumacher and Hall was used as a control for comparison with the nonlinear mixed models. The adjustments of the mixed models were performed by adopting six distinct structures for the matrix of variances and covariances. The selection the best equation was done using the Akaike information criterion (AIC) Test Likelihood Ratio (TRMV), Mean Absolute Percentage Error (EPAM) and Vuong test. According to the criteria adopted, mixed models obtain better adjustments when compared with the classical model of Schumacher and Hall, resulting in a decrease in mean absolute percentage error of 4.6% to 3.2%. Based on these results, the nonlinear mixed models appear quite effective for modeling the volume of Eucalyptus and tend to contribute to the reduction of inventory costs with greater accuracy.
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