Relação entre as características da madeira e da polpa celulósica de Eucalyptus com os métodos não destrutivos na árvore viva

Abstract

The evaluation of technological characteristics of wood requires measurements of a great amount of samples to obtain precise results, which has led to the search of new methodologies and equipments that would make this work faster and, at the same time, would reduce the operation costs if possible in field condition. The objective of the present work was to check the relationship among certain chemical and physical characteristics of wood and cellulose pulp, obtained through laboratorial analyses (destructive), with non destructive methods, namely: pilodyn, resistograph, NIRS and extensometer, applied to the living tree. The results showed that the wood basic density presented positive correlation with the longitudinal residual strain (LRS) and width (AMP) and negative correlation with the penetration of the pin of pilodyn (PILO). The values of DRL presented positive correlation with the wood cellulose content and negative correlation with the lignin content. The AMP presented negative correlation with the lignin content. It was observed that the LRS, PILO and AMP presented positive correlation with the syringyl/guaiacyl (S/G) ratio. The LRS and AMP presented negative correlation with the kappa and the viscosity but positive with the pulping yield. In the Near Infra-red Spectroscopy- NIRS, the correlations obtained through the external prediction values and laboratory by using models created from samples from these experiments were better than the values predicted by an existing model constructed by a Brazilian Forest Company.