TESTING OF WOOD PHYSICAL PROPERTIES IN OAK SPECIES (QUERCUS ROBUR L., Q. PETRAEA(MATTS) LIEBL. AND Q. PYRENAICA WILLD.) FOR COOPERAGE. PART II: WOOD GRAIN

Our research about wood physical properties of Quercus robur L., Q. petraea (Matts) Liebl., and Q. pyrenaica Willd., for cooperage was founded on the calculate of wood grain to estimate the change of this property in the Galician oaks. Overall, 45 trees were selected in 15 oak forests of the provinces of Lugo and Ourense (Galicia, NW Spain), of which we obtained 45 thin slices of wood at 60 cm tall on the trunk, and 194 wood samples parallelepipeds of 2 x 2 x 4 cm +/- 1mm. The grain of Quercus pyrenaica and Q. robur are similar to oaks Limousin region, France. Quercus petraea is comparable to the Vosges oaks. Now, both regions are among the most important sources in quality oaks for manufacturing barrels. Our global objective was to realize a detailed description on the physical properties of wood of these species for its possible use in industry cooperage. For this, the aim of this second work was to continue with the study of wood grain.