Abstract

GUTIERREZ-VAZQUEZ, Benito N.  and  FLORES-MONTANO, Amelia. Pattern and magnitude of the variation of the wood density in seed production stands of Pinus oocarpa. Madera bosques [online]. 2019, vol.25, n.3, e2531615.  Epub May 15, 2020. ISSN 2448-7597.  https://doi.org/10.21829/myb.2019.2531615.

In the state of Chiapas, Mexico, Pinus oocarpa Schiede ex Schlechtendal is one favorite species for the establishment of forest plantations and ecological restoration. However, the variation of important variables such as wood density is unknown. The objective of this study was to know the sources of the phenotypic variation of the basic wood density, the patterns of axial and radial variation, and predictive models to estimate the mean wood density (DPM) of Pinus oocarpa in seed production stands in Chiapas, Mexico. Wood samples was obtained at a 1.30 m, 0.30 m, 1.30 m, 40% and 60% height from trees from each population. The density of the wood was determined with an empirical method. The variation was determined by an analysis of variance and components variance. The variation attributable to the seed production stands was low (10.70%). The highest variation was detected between and within trees with 39.30% of the total variation. The pattern of axial variation was descending, presenting higher density in the lower part of the stem. The radial variation for this species indicates an increase in the density of the wood from the pit to the bark. The model DPM = 0.107 + (0.714 * den0.30) is the simplest and has a value of R2 adj of 0.927 to determine the mean density of the tree. The correlation indexes in Corazón del Valle suggest the possibility of selecting and producing P. oocarpa genotypes of fast growth, and at the same time obtaining a higher density in the produced wood.

Keywords : components of variance; wood density; variation patterns; Pinus oocarpa; axial and radial variation; phenotypic variation.

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