Abstract

HONORATO SALAZAR, José Amador; APOLINAR HIDALGO, Flora  and  COLOTL HERNANDEZ, Gertrudis. Lignocellulosic composition of Pinus ayacahuite Ehrenb. Ex Schltdl., P. leiophylla Schlecht. & Cham. Rev. mex. de cienc. forestales [online]. 2016, vol.7, n.34, pp.47-56. ISSN 2007-1132.

The municipality of Pueblo Nuevo, Durango, produces one fourth of the timber in the state, and 89 % of it is obtained from 12 pine species. However, there are no studies on the wood chemical composition of exploited pine trees. The aim of this study was to determine the lignocellulosic composition and the ash content, as well as the contents of extracts in ethanol-benzene and in ethanol, of Pinus ayacahuite, P. leiophylla and P. herrerae wood, according to the procedures of the TAPPI and ASTM standards. Random samples were taken from 5 to 6 trees per species, with 5 repetitions per tree per test. The collected data were subjected to normality and variance homogeneity tests and to a multiple comparison of means (Bonferroni, α = 0.05) using the SAS software. The results showed significant differences between species (p < 0.05) for the average values of the determined contents, with the exception of ash. Pinus ayacahuite wood has high contents of extracts in ethanol-benzene and lignin. P. herrerae wood has lower contents of extracts in ethanol-benzene and lignin, but higher contents of holocellulose and cellulose P. leiophylla wood has lower holocellulose, cellulose, hemicelluloses and ash. The contents of lignin, hemicelluloses and cellulose of the wood of these species support its use as a source of raw materials for obtaining pulp for paper and liquid biofuels.

Keywords : Ashes; cellulose; chemical composition; extracts; lignin; pine trees.

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