Resumo

GARCIA-ESPINOZA, Guadalupe Geraldine et al. Accuracy of form coefficients and quotients in estimating the volume of Pinus montezumae Lamb. Rev. mex. de cienc. forestales [online]. 2016, vol.7, n.35, pp.19-36. ISSN 2007-1132.

Accurate determination of timber volume is necessary for the sustainable forest management because silvicultural treatments promote changes on their mensuration characteristics. The aim of this study was to evaluate the accuracy of seven form coefficients and five quotients to estimate the stem volume of standing trees of Pinus montezumae Lamb. It was carried out in forests of Comunidad Indígena de Nuevo San Juan Parangaricutiro; Michoacán where sections diameters and lengths of 245 trees were measured with a Biitterlich relaskope. Volumes of coefficients and quotients were compared to calculated values of one generated equation. Of all coefficients and quotients tested, only three forms achieved the precision required: the morphic coefficient of the bole (0.52 %), the morphic coefficient of the bole to the total height (0.85 %) and Pressler coefficient (1.18 %). Results shows that the use of morphic coefficients and form quotiemts depends on the conformation of the bole of the species as quotients make a better estimation of the conic and neiloidic shapes while coefficients do for the paraboloids.

Palavras-chave : Form quotients; form coefficients; Comunidad Indígena de Nuevo San Juan Parangaricutiro; mathematical models; Pinus montezumae Lamb.; timber volume.

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