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The study aimed to calibrate the model 3-PG for Eucalyptus saligna for the following the diameter variables at breast height (DBH), total height, wood volume and branch, bark and wood biomass. The study took place in the region of Guaiba, Rio Grande do Sul state, Brazil. Clonal plantations of Eucalyptus saligna in various spacings were used. Six different ages were selected along the crop cycle (2nd to 7th year). After the forest inventory was carried out, the biomass of three trees fractionated into wood, bark, branches and leaves was collected. The biomass of roots on the average tree of each plot was measured to a depth of 1 m. Physical and chemical analyses were performed in soil samples from the layers: 0 to 20 cm, 20 to 40 cm and 40 to 100 cm. Litter deposition was estimated by allocating 4 square collectors of 0.5 m². The leaf area was obtained through digital photographs and thus the specific leaf area was estimated. The physiological parameters were measured in six plots, one at each age. Climatic parameters were provided by EEA of UFRGS University, located in Eldorado do Sul, RS state. The model validation was not statistically accepted, but their estimated data can be used to estimate the studied variables, demonstrating the potential of its use although additional studies for the application of the model to this species are still needed.

CALIBRAÇÃO DO MODELO 3-PG PARA <i>Eucalyptus saligna</i> Smith NA REGIÃO DE GUAÍBA - RS