Abstract

OROZCO CONTRERAS, Rolando et al. Pine lumber grade recovery as a function of log characteristics. Rev. mex. de cienc. forestales [online]. 2016, vol.7, n.36, pp.37-50. ISSN 2007-1132.

The objectives of the present study were to determine the volume of lumber yield per quality grade of four pine species, evaluate significant differences per lumber grade and assess the feasibility of using a discriminant function to separate the grade qualities of sawn wood (lumber) as a function of the round wood characteristics (logs). The sample size was 80 logs (20 of each species). Pinus durangensis gave the best yield of lumber with grade 2 and better, with a 6.56 %, followed by P. teocote (4.57), while P. strobiformis reached just 0.59 in that quality. The Kruskal-Wallis test encountered significant differences (P<0.05) in the yield volume per quality grade in 14 of the 25 evaluated species pairs. P. durangensis and P. strobiformis are the two species with more significant differences in yield per quality grade in comparison with the rest. The discriminant linear function correctly classified the 27, 15, 53, and 90 % of the boards in the quality grades 2nd and better, 3rd, 4th and 5th, respectively. The study results indicate that the species has a significant effect in the yield per quality grade of lumber; it was also observed that it is feasible to use a discriminant linear function to estimate the lumber yield of pine of grade 5, as a function of the log’s characteristics.

Keywords : Pine forest; forest industry; round wood; productivity; volumetric yield; boards.

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