Estudo dos anéis de crescimento da Araucaria angustifolia (Bertol.) Kuntze no município de Tapera – RS

Abstract

This study had as objective to analyze the growth of thickness of growth rings of trees of Araucaria angustifolia, present in Tapera city, Rio Grande do Sul. In this study, it was used 44 Araucaria angustifolia samples, analyzed in the past six decades, to find an equation, using regression models that describe the development of the growth rings of trees. Thus, it was done a descriptive analysis of the collected measurements (thickness of the rings), for the eleven trees, per a decade, considering the period from 1950 to 2009, presenting the average values, median, minimum, maximum, standard deviation and coefficient of variation, to characterize the analyzed sample. After, it was performed a regression analysis, for five years, in which it was searched, among the various types of models available that one that best estimated the thickness of the average tree ring analyzed. The best model which fit to the data was the Compound, which was not found available material that detailed this type of found model. This way, it was considered that the thickness of the full rings (beginning logs and end of season) the growth rings to each of the eleven samples of trees, which ones have grown and declined over the past decades. This variation can be explained by environmental factors that acted in this five-year period and resulted in the formation of the thickness of the rings.