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On-line version ISSN 1806-9088
RETSLAFF, Fabiane Aparecida de Souza et al. Growth and yield prognosis in diameter classes for thinning Eucalyptus grandis stands in Brazil south. Rev. Árvore [online]. 2012, vol.36, n.4, pp.719-732. ISSN 1806-9088. http://dx.doi.org/10.1590/S0100-67622012000400013.
This study aimed to develop growth and yield models by diameter classes for Eucalyptus grandis plantation with thinnings. The data used for modeling are from Eucalyptus grandis plantation located in Telêmaco Borba, Parana state, and came from permanent, temporary plots and pre-harvesting inventory, with ages ranging from 2.5 to 26.5 years. The Weibull probability density function was used to generate the diameter distribution. The stand attributes modeling process was divided into steps, considering the development stages of stands. Thus, two prognosis systems were generated to predict the attributes in the age of first thinning, second thinning or for the final cut. The modeled attributes were those required for recovery the Weibull function parameters at the ages of intervention by the moments method. To evaluate the prognoses the Kolmogorov-Smirnov adherence test and the L&O identity test proposed by Leite and Oliveira (2002) were used. Both prognosis systems presented good estimates of adjustment and accuracy. The methodology allowed to simulate the growth and yield in Eucalyptus grandis stands trough the rotation, generating logical results, especially for the final cut where the best trees was harvested with higher added values.
Keywords : Diametric structure projection; Thinning; Weibull function.