Dendrometria e morfometria da Araucaria angustifolia (Bertol.) Kuntze sob diferentes condições de manejo

Abstract

This study aimed to evaluate the dendrometry and morphometry of Araucaria angustifolia in two forest stands of the same age under different management conditions. The areas were classified as: Site 1 - without management in the city of Dois Vizinhos and Site 2 with management located in Quedas do Iguaçu - PR. The stands have 42 years old, where 118 trees were measured in random order, with 60 trees at Site 1 and Site 2 in 58 trees. Variables dendrometric measures were: total height (h), commercial height (hc), then start at the top (hic), diameter at breast height (dbh) and crown diameter (dc) and the morphometric variables were: index protrusion (s), coverage index (ai), formal canopy (fc), proportion of canopy (pc) and degree of slenderness (g). Data were subjected to analysis of variance and Pearson correlation analysis to assess, respectively, the difference and the correlation between morphometric variables and dendrometric the different study sites. The procedure Proc STEPWISE was applied to model the equations for the relationship between dc and dap. To choose the best equation, the parameters taken into consideration were: high value of determination coefficient (R²aj), the lower value of coefficient of variation (CV%), the highest value of F calculated and good distribution of residuals. The variables height, commercial height, crown length and crown diameter were the variables that showed significant differences between the study sites. The crown diameter was the variable that showed the highest correlation with the diameter at breast height, followed by the variable degree of slenderness ratio and coverage. And the equation that best represents this relationship was √dc = 0.6177 + 0.04928 * dap. The difference in level and inclination was tested but was not significant among the study sites, it was found that the same equation could be used to estimate both the dc stands.