Abstract

FLORES MORALES, Edgar Alan et al. Normal diameter, height and volume estimation of Pinus pseudostrobus Lindl. from the diameter of the stump. Rev. mex. de cienc. forestales [online]. 2019, vol.10, n.55, pp.154-170.  Epub Feb 14, 2020. ISSN 2007-1132.  https://doi.org/10.29298/rmcf.v10i55.547.

Stands can be affected by several factors, such as natural phenomena or forest management because they modify their structure and residual timber volume. The quantification of the volume removed in a forestry intervention is usually difficult, but after the application of silvicultural treatments the stump keeps evident; based on its dimensions, it is feasible to generate regression models to know the normal diameter, height and standing volume. Thus, 83 trees were measured with a dendrometer in order to obtain the most reliable equation to determine the functional relationship between a) normal diameter - stump diameter; b) total height-stump diameter and c) total volume-stump diameter. Linear and nonlinear models were adjusted to the established relationships. Different criteria of goodness of fit were used to choose the best model: the coefficient of determination, the root of the mean square error and the coefficient of variation. With a simple linear equation you can predict the normal diameter-stump diameter ratio and with a polynomial equation, the total height-stump diameter ratio. For the volume-diameter ratio of the stump, a system of equations with multiplicative effect was generated in order to correct the heterocedasticity. The generated equations gave statistically reliable results to predict the variables of interest.

Keywords : Heteroskedasticity; forest management; linear models; stump; Pinus pseudostrobus Lindl.; mensuration variables.