Dinamica da rela??o hipsométrica em fun??o da idade, do sítio e da densidade inicial de povoamentos de bracatinga da Regi?o Metropolitana de Curitiba, PR

摘要

The objective of this research was to analyse the behavior and the dynamics of hypsometric curves for age, site and initial density in native stands of bracatinga (Mimosa scabrella Benth), growing in the Curitiba Metropolitan Region. The data came from DBH and total height measurements of each tree in 20 permanent sample plots, remeasured 4 times from 4 to 7,5 years old, covering 3 different site classes and the initial densities of 2,000, 4,000, 8,000 and the control plots, with average 25,000 plants/ha. Basing on the same set of data Bartoszeck (2000) carried out an intensive research on modeling the height-diameter relation. Then the Curtis model, resulting in an equation for each combination of factors, was used to proceed with the proposed analyses. Covariance analysis was used to examine the effects of age, site and initial density on the height-diameter curve. Graphic analyses were simultaneously done also for all possible combinations, that is, 4 ages, 3 sites e 4 densities, by using the equations resulting from the Curtis model for each factor combination. As conclusive results obtained through the covariance analysis, it was detected statistically significant effects for age as well as for site in the hypsometric relation. Conversely, the density factor did not have significant effect on the relation.