Mensuração do crescimento de árvores de Hovenia dulcis Thunb., por diferentes métodos

Abstract

The specie Hovenia dulcis Thunberg it's a exotic plant belonging to the family Rhamnaceae and that happens in the south and southeast of Brazil. This plant has a wide potential of its use, so it's necessary to know about the development of this plant. One way to do the studies about the grownth of the tree species it's by the technique stem analysis, which consists of the growth rings measurement in slices taken Along the A tree trunk. Aiming to Decrease the rate of realization this practice, and Increase Quality of Results, New methodologies have been developed. With that this paper present as objective evaluate the difference in the measurement of growth rings by different methods of stem analysis and check the volume growth behavior, diameter and height of the species Hovenia dulcis Thunberg., through the best studied method. The different measurement techniques were applied to 24 wood chips, four trees taken from the native forest of the Federal Technological University of Paraná, Campus Two Neighbors. The discs were extracted the following positions: 0%, 25%, 50%, 75% and 100% of the commercial height and diameter at breast height. Each disc was sanded, and then the measurements of the widths of the rings by manual stem analysis, and the digital Lintab. Using the information obtained in the different methods was designed longitudinal profile of each tree sampled, and the following variables then obtained in each age: total volume, dap and height. Through the statistical analysis we found that the measurement methodology did not interfere significantly in getting the volumes and heights, only to DAP methodology interfered significantly. The Lintab method was used as the most reliable and accurate to perform the adjustment of growth models in volume, diameter and height. Over the observation of the data generated by Anatro with Lintab, the tree´s growing have shown difference among the A,B and C,D individual. Then the adjustment was made separately between similar trees. To estimate the quantity of A and B trees, the model 5, y= b0 . [1- exp (- b1.t )b2] , with the best performance, and the others were two models with good performance, the model 5, y= b0 . [1- exp (- b1.t )b2] , and Schumacher. Regarding the estimation of the diameter of trees A and B, the best result has offered Backman model, as for C and D trees the model 5, y= b0 . [1- exp (- b1.t )b2] , is the most suitable. The models of Mitscherlich and Chapman-Richards gave the best results in the estimation of height and showed similar performance.