COMPATIBLE HEIGHT AND SITE INDEX MODEL FOR FOUR PINE SPECIES IN SANTIAGO PAPASQUIARO, DURANGO

Abstract

Forest productivity is a biological concept that can be expressed mathematically. Compatible dominant height-site index models are of the most important forest zones of Mexico. The data used were obtained from the stem analyses of 202 dominant trees. Korf, Hossfeld and Bertalanffy-Richards models were adjusted by the method of Generalized Algebraic Differences (GADA). The principal advantage of this method is that it depends on the quality station more than one parameter of the models, so that the curves obtained are polymorphic and with multiple asymptotes. A second-order autoregressive error structure was used in the fitting process to correct the serial correlation of the longitudinal data. Based on the goodness of fit statistics and a graphical analysis, the Bertalanffy-Richards model is recommended to qualify the quality station of the four species. This equation is polymorphic with multiple asymptotes and base-age invariant, and also directly estimates the dominant height and the site index at any height and reference age. Using these equations will significantly improve the current estimate of the productive potential of the species studied.