Local and generalized height-diameter models with random parameters for mixed, uneven-aged forests in northwestern Durango, Mexico

Abstract

Background: We used mixed models with random components to develop height-diameter (h-d) functions for mixed, uneven-aged stands in northwestern Durango (Mexico), considering the breast height diameter (d) and stand variables as predictors. Methods: The data were obtained from 44 permanent plots used to monitor stand growth under forest management in the study area. Results: The generalized Bertalanffy-Richards model performed better than the other generalized models in predicting the total height of the species under study. For the genera Pinus and Quercus, the models were successfully calibrated by measuring the height of a subsample of three randomly selected trees close to the mean d, whereas for species of the genera Cupressus, Arbutus and Alnus, three trees were also selected, but they are specifically the maximum, minimum and mean d trees. Conclusions: The presented equations represent a new tool for the evaluation and management of natural forest in the region.