Keywords
Pinus
Quercus
reduced equation system
full equation system
How to Cite
Abstract
Aim: In this study, significant differences were evaluated in additive equation systems for estimating the total volume of individual trees in nine species of the genus Pinus (P. cooperi, P. durangensis, P. arizonica, P. leiophylla, P. teocote, P. engelmannii, P. lumholtzii, P. strobiformisand P. herrerae), and three of the genus Quercus (Q. sideroxyla, Q. durifoliaand Q. rugosa), and among regional forest management units (UMAFOR) when dealing with the same species. Materials and Methods: To evaluate whether equation systems are different among tree species of the same genus and among the UMAFORs for the same species, two complementary statistical analyzes were used based on the fitting of a reduced and a full equation system: the F test of nonlinear extra sum of squares method, and the parameter significance analysis. The reduced equation system does not differentiate among species or UMAFOR, while the full equation system corresponds to a set of species-specific or UMAFOR-specific parameters. Results and Discussion: The results of the study indicate that, for most species studied, systems of equations are significantly different. It is also reported the need to use regional models in 10 of the 12 tree species, except for P. strobiformis and Q. rugosa.References
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