Dynamic site index models for four pine species in Oaxaca
DOI:
https://doi.org/10.29298/rmcf.v9i49.185Keywords:
Dominant height, site index curves, dynamic equation, reference age, GADA, Bertalanffy-Richards equationAbstract
Site index models represent an important tool to classify forest productivity. The goal of this research was to develop dynamic site equations derived with the Generalized Algebraic Difference approach (GADA) for four pine species growing in the Northern Sierra of Oaxaca, Mexico. Data from stem analyses of Pinus oaxacana, P. douglasiana, P. patula and P. pseudostrobus trees were used to fit the equations. The trees were selected in mixed and irregular stands, trying to cover the different sites qualities present in the areas subject to forest management in the forests of the Unidad de Manejo Forestal Regional 2001(Regional Forest Management Unit 2001).The models were fitted through the iterative procedure, utilizing a second-order autoregressive error structure (CAR2) to correct for the serial correlation of term of error. The results indicated that the GADA formulation from the Bertalanffy-Richards equation can be used for accurately describing the site index for the four species studied. This function is polymorphic, dynamic and invariant with the reference age, with multiple asymptotes. It provides compatible site index and dominant height growth estimates for the four species.
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