Abstract

RODRIGUEZ-CARRILLO, Antonio; CRUZ-COBOS, Francisco; VARGAS-LARRETA, Benedicto  and  HERNANDEZ, Francisco J.. Compatible dominant height - site index model for juniper (Juniperus deppeana Steud.). Rev. Chapingo ser. cienc. for. ambient [online]. 2015, vol.21, n.1, pp.97-108. ISSN 2007-4018.  https://doi.org/10.5154/r.rchscfa.2014.09.041.

The aim of this study was to determine the site quality of juniper (Juniperus deppeana Steud.) in the San Dimas region of the state of Durango, Mexico, using the site index method. The database comes from stem analysis of 43 trees felled in harvesting activities. The Chapman-Richards and Schumacher models, by means of the algebraic difference and generalized algebraic difference approaches, were tested to determine the site index; in addition, the error structure was modeled with a second-order autoregressive model to remedy the dependency of existing longitudinal errors. The results showed that the Chapman-Richards model in generalized algebraic difference form provided the best fit according to the adjusted coefficient of determination (R²_adj = 0.98) and root mean square error (RMSE = 0.46 m). Plotting of the quality curves generated with this model, superimposed on the observed heights, corroborated the goodness of fit of the model selected. The equation obtained with the generalized algebraic difference approach directly estimates the dominant height and site index at any height and base age.

Keywords : Algebraic difference approach; generalized algebraic difference approach; Chapman-Richards.

        · abstract in Spanish     · text in English     · English ( pdf )