Desenvolvimento de mudas de Cedrela fissilis, Ocotea porosa e Vitex megapotamica sob diferentes luminosidades

Abstract

This project had as its work hypothesis that forest species have requirements and responses to differentiated light conditions, being one of the primary factors in determining the success of forest restoration projects. Thus, this study aimed to evaluate the effect of different levels of solar radiation through morphological analysis in the development of these forest species: Cedrela fissilis, Ocotea porosa and Vitex megapotamica. The experiment was conducted in nursery bed, with plants distributed in three different lighting conditions consisting of a gradient of average brightness in relation to the full light of day: 100%, 50% and 10%. In an eight-month period the height of the shoot and the collar diameter were monitored at intervals of 30 days. At the end of the experiment, at the 210th day, the leaf area, dry biomass of shoots, roots and total were evaluated by the destructive method. The experimental design was by randomized blocks, consisting of three treatments (species) and fifteen blocks of single-tree plots. For the evaluation of the tests it was used the analysis of variance (ANOVA), and the averages obtained were compared using the Tukey test at 5% probability. For the evaluation of the species in relation to different levels of light intensities tested it was applied the two sample t test. Based on the results we reach the following conclusions: the height and diameter of the collar of the cedro-vermelha seedlings were greater than of the ocotea-imbuia and tarumã-azeitona in three light regimes tested. The leaf area was not affected by the light levels. Under the light condition of 10%, the leaf area, specifically for trauma was clearly larger compared to the cedro-vermelha and ocotea-imbuia. Under the full light of day it was not observed any effect in the production of root biomass.