Dendrocronologia de Cordia americana (L.) Gottschling & J.S. Mill. e Aspidosperma polyneuron Müll. Arg. no município de Realeza, PR

Abstract

Aspidosperma polyneuron and Cordia americana represent species of great importance within the forests, both for its ecological functions, as the quality of the wood. This study was conducted in the municipality of Realeza - PR, with objective to verify the delimitation of growth rings each species, estimate the diameter growth as a function of age by fitting mathematical equations to Cordia americana, compare dendrometric variables and morphometric to the regular annual increment and annual diametric periodic basal area increment in addition to model the increment for the species of Cordia americana. and Aspidosperma polyneuron, thereby serving as a subsidy for future sustainable management practices thereof. For each tree were measured: diameter at breast height (DAP), total height (h), height of canopy top (hic), canopy height (hc), crown length (cc), crown radius (rc) , crown diameter (dc), coverage index (IA), protrusion index (IS), degree of slenderness (GE), formal canopy (FC), vitality canopy (Vc), distribution of branches (Dg) trunk quality (Qf), sociological position (Ps), display of the terrain (ET), single bark thickness (Ec), form canopy (Fc), liana infestation (IL), and growth analysis will be collected from trees rolls increment. For data analysis we used the Microsoft Excel Software and Statistical Analysis System (SAS, 1999). The delimitation of Cordia americana rings was possible from the change in the spacing of the tangential parenchyma bands, being visible, because they have marginal parenchyma limiting the start and end of each ring. For Aspidosperma polyneuron there is a differential in the fiber wall thickening end of the growing period, and have slightly different growth layers demarcated by tangential fibrous darker areas. Comparing the IPAd and Cordia americana variables sampled only the DAP and canopy diameter were significantly correlated. As for the qualitative variables was no influence of vitality canopy, canopy shape, sociological position and distribution of branches. To Aspidosperma polyneuron the DAP, h, hic, hc, Dc, S, GE variables had significant correlation with the IPAg. Since the qualitative variables vitality canopy, canopy shape, distribution of branches and sociological position were that influenced the IPAg. To explain the IPAd individuals of Cordia americana, DAP was the variable with highest significance, and the model was selected through modeling IPAd = 0.52505 +0.02464 * DAP. The estimate of the IPAg Aspidosperma polyneuron, could be explained only in terms of DAP, and the model was selected IPAg = 1.06463 +0.46330 * DAP. The model Backman was the equation that best fit the data of diameter growth as a function of age of Cordia americana.