Identificação de madeiras de clones de Eucalyptus grandis, Eucalyptus urophylla e do híbrido Eucalyptus urograndis por RMN 13C

Abstract

The Eucalyptus genus is represented for trees that have high growth rate, plasticity, straight way of stem growth, natural pruning and wood with the technological properties suitable for a diverse use. In function of ecological society pressure and the larger distance between the forest and the consumer center, the native woods have been substituted by eucalyptus wood, which presents enough condition and great options to supply the necessity and the exigent wood market in Brazil. In this context, many researches on Eucalyptus have been carried on several point of view. One of difficulty for usury of Eucalyptus wood is its identification. For solve this problem, it was developed an alternative way for Eucalyptus wood identification, without to take hand the anatomical and morphological tools. Thus new methods of identification faster and cheaper must be developed. On this way, the application of Nuclear Magnetic Resonance (NMR) showed to be one promise technique for wood identification. This research has turned possible with NMR 13C spectrometry method. A spectral variation among cyclohexane extracts permitted to observe the physiological, ecological and genetical behavior on the Eucalyptus wood. Dada of 13C NMR has shown that the cyclohexane extracts spectra of heartwood were the most representative for the wood identification, than others solvent. With these data was possible to establish a common spectral profile for E. grandis, E. urophylla and E. urograndis from each anatomical wood region (sapwood, transition zone and heartwood).