Abstract
Site index curves were adjusted for Eucalyptus urograndis stands located in the municipality of Nova Canaa, MT, using the guide curve method. Six mathematical models were tested to estimate the dominant height of the trees according to age and to verify their accuracy for the definition of site indices. The models tested presented similar values with R² values around 0.40 and errors close to 15%, although none presented expressive superiority in relation to the others. The Schumacher model was used for the construction of curves with four classes of site and with amplitude of three meters each. The model was chosen by the pelasestatisticas presented, for the simplicity and adequate estimation of the heights of the trees with only two parameters, presenting the best graphical distribution of the residues
Highlights
In the forest sciences the site is used to designate the influence of the environment on the production of wood, or other products obtained from a forest stand (Batista & Couto, 1986)
When comparing the models of Schumacher and Prodan, we find that the Schumacher model has advantages, this model better describes the variation of dominant height as a function of age using only two coefficients
The Schumacher model is suitable for the construction of site index curves by the guide curve method, due to the superiority of the plot stability test, its adjustment statistics are close to the other models
Summary
In the forest sciences the site is used to designate the influence of the environment on the production of wood, or other products obtained from a forest stand (Batista & Couto, 1986). For the definition of this site index, equations are used that describe the functional relationships between dominant height and age With these equations one can construct the site index curves, where each curve represents a site index, which corresponds to the average height of the dominant trees at a reference age, called the index age. The definition of this index age is arbitrary, but in general it must be close to the cutoff shift
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