Análise de similaridade das árvores de Cedrela sp. Sob diferentes condições de crescimento no leste do estado do Acre, Brasil

Abstract

The biodiversity of tropical forests depends on certain level of environmental disturbances, such as the natural fall of trees providing clearings, seed germination, growth and development of plants that environment. On the other hand, forest management intervenes in this natural cycle, by removing larger trees of the species which are of great commercial value. However, little is known about natural growth and regeneration of the hundreds of tropical species; and this constitutes a gap and obstacle to the implementation of sustainable forest management, by permitting the maintenance of biodiversity. In this regard, this study aims to determine the age and growth periodicity of stem of native Cedrela sp. trees in Acre under different growth conditions (sites and microsites) to provide subsidies to sustainable forest management in this region. Trees of Cedrela sp were selected at three sites: Experimental Reserve Catuaba (REC) (three microsites), Farm São Jorge (FSJ) Zoobotanic Park (PZ). Wood samples were collected at DBH of the trunk for the dendrochronological analysis. This was followed by the demarcation, counting and measuring the width of growth rings. Next, the Cofecha program was used for the quality control of the series of growth rings. Using the parameters: number, average width of the growth ring, standard deviation and the DBH of the tree stems, a similarity of trees Cedrela sp. in site and microsites was observed by multivariate statistical analysis.Different growth conditions (sites and environments) significantly affected the radial growth of trees Cedrela sp., demonstrating the potential of dendrochronology as a tool for forest management.