Data of eucalyptus stands submitted to selective thinning were used to diametric distribution modeling. Two models were adjusted: one for prediction and another for projection. In both cases, the model was constituted by non-linear equations systems. In the first case the parameters of the Weibull function were predicted in function of characteristics of the plantation. In the second, the parameters of that function, observed at the present age, were used as independent variables to estimate those parameters at further ages. The results proved a larger efficiency in the modelling through projection.
Diametric distribution; Prediction; Projection
