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Among the characteristic properties of timber from natural tree stands, particu- larly those in arid and semi-arid zones, variations in colour are decisive in the uses made of the wood as a high add- ed-value visible material, in joinery and cabinet-making for example. This study was conducted to help promote the aes- thetic value of a woody species which is common in Algeria but under-researched, the Mt. Atlas mastic tree, Pistacia atlan- tica Desf. Variations in wood colour were assessed from samples cut from the sapwood and heartwood of mastic trees from two different bioclimatic regions in north-western Algeria. The colour assess- ments were made at the Forest and Timber Resources Laboratory (LERFoB) in Nancy, France, using a spectropho- tometer with measurement and display software. The results indicate variations between the two regions in the colour of Mt. Atlas mastic tree wood (for the three chromatic components L*, a* and  b*)  and among the different trees (compo- nent L*). The colorimetric components of the lighter-coloured sapwood, especially brightness (L*) and the red-green com- ponent (a*),  are very different to  those  of the heartwood. From this we infer that environmental factors have an influence on the colorimetric characteristics of the wood in this species, as well as the intrin- sic individual characteristics of each tree. Finally, brightness (L*) and the red-green (a*) and blue-yellow (b*) components vary between the different types of mas- tic tree wood.

ÉVALUATION DE LA VARIABILITÉ DE LA COULEUR DU BOIS DE PISTACIA ATLANTICA DESF. DU NORD DE L’ALGÉRIE