Abstract
Liberation of growth stresses during cutting and sawing prevents the use of eucalyptus as working timber. The occurrence of log-end cracks and planks, due to the release of growth stress pre-existing in the standing tree, causes severe damage at the early stage of wood transformation. In this study, we determine the GSI of two clonal eucalyptus wood originated from Gharb Mâamora plantations, so as to have an idea about the occurrence of cracks before first wood transformation. The measurements of growth stress indicator (GSI) were performed on six trees of each clone by the single-hole method. Changes in moisture and basic density were carried out on wood discs. Results of GSI have showed the existence of variability in the distribution of GSI within the studied trees. Clonal eucalyptus trees exhibit a high nervousness illustrated by high GSI values associated with the presence of reaction wood. Changes in moisture and basic density of wood discs for these clones are variable from the core to the periphery. The important GSI values and moisture content and basic density gradients are responsible of splitting, cracks and distortions observed after cutting and/or sawing.
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