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O presente trabalho teve como objetivos definir uma equação para descrever as alturas de árvores de Eucalyptus dunnii Maiden em função dos diâmetros medidos a altura do peito. Os dados foram coletados em árvores amostras com idade de seis e sete anos, em quatro hortos florestais da empresa Riocell S.A. localizados na Depressão Central e Encosta do Sudeste do Rio Grande do Sul. Foram ajustados modelos matemáticos, com o emprego do procedimento Forward de regressão, para descrever a relação hipsométrica. Na seleçõo dos modelos foram considerados as estatísticas de coeficiente de determinação (R²), erro padrão da estimativa em percentagem da média (Syx %), bem como, a análise de resíduos dos modelos, tendo sido selecionada a equação In (h-1,30) = b0+b1.ln d + b2.log²d, com coeficientes R² =0,8921 e Syx %= 2,5175. The present work had the objective to define an equation to describe plant heights in function of diameters of Eucalyptus dunnii Maiden. Data were collected infour properties of Company Riocell S.A distributed along several counties of the Central Depression and Southeast Slope of the State of Rio Grande do Sul. The trees sampled were six to seven years old. The datas were adjusted to heights and diameters to describe the hypsometric relation, usingthe Forward regression procedure. In the selection of the model,the coefficient of determination statistics (R²), standard error of estimate in percentage of means (Syx °/o) as well as residue analyses of the models were considered. The best height estimations were obtained with the equations In (h-1,3) = b0, + b1 logd + b2ln²d, which showed the following coefficients R² = 0.8921 and Syx %= 2.5175

Funções para descrever a relação altura diâmetro de Eucalyptus dunnii Maiden