Normal diameter, height and volume estimation of Pinus pseudostrobus Lindl. from the diameter of the stump
DOI:
https://doi.org/10.29298/rmcf.v10i55.547Keywords:
Heteroskedasticity, forest management, linear models, stump, Pinus pseudostrobus Lindl., mensuration variablesAbstract
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.
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