Generalized height-diameter equations for Pinus teocote Schlecht. & Cham. in the state of Hidalgo
DOI:
https://doi.org/10.29298/rmcf.v6i31.192Keywords:
Total height, normal diameter, generalized equation, nonlinear models, Pinus teocote Schlecht. & Cham., tandAbstract
The height-diameter relationship is important in forest inventories to determine the stock and growth models. However, measuring the height entails greater difficulty and cost, so an option is to do it by means of a subsample, for which the use of equations is convenient. The objective of this study was to select a generalized best fit equation to estimate the relationship of total height as a function of normal diameter (h-d) for pure pine stands of Pinus teocote in the eastern area of the state of Hidalgo. A total of 1 985 pairs of h-d data were used; 1 802 pairs were utilized to adjust the 13 equations by means of the MODEL procedure and the SUR technique, and 183 pairs, to validate them. The equations were selected based on a goodness-of-fit test with Mean Square Error and R2adjusted. The normality of the data, the heterogeneity of the variances and the homogeneity of the residuals were verified. The Gadow and Hui equation displayed the best fit with R2adjusted. = 0.9396 and Root MSE = 1.628. The values of the Shapiro–Wilk test (0.982776), the Durbin–Watson test (1.831) and the Breusch–Pagan test (2.71) and the absolute bias (0.013) validate the equation. No significant differences between the predicted and the real values were found (t test at 95 %). With this model, it is possible to estimate the total height of P. teocote on the basis of the normal diameter, the square diameter and the mean height of the trees at the site.
Downloads
Downloads
Published
How to Cite
Issue
Section
License
The authors who publish in Revista Mexicana de Ciencias Forestales accept the following conditions:
In accordance with copyright laws, Revista Mexicana de Ciencias Forestales recognizes and respects the authors’ moral right and ownership of property rights which will be transferred to the journal for dissemination in open access.
All the texts published by Revista Mexicana de Ciencias Forestales –with no exception– are distributed under a Creative Commons License Attribution-NonCommercial 4.0 International (CC BY-NC 4.0), which allows third parties to use the publication as long as the work’s authorship and its first publication in this journal are mentioned
The author(s) can enter into independent and additional contractual agreements for the nonexclusive distribution of the version of the article published in Revista Mexicana de Ciencias Forestales (for example, include it into an institutional repository or publish it in a book) as long as it is clearly and explicitly indicated that the work was published for the first time in Revista Mexicana de Ciencias Forestales.
For all the above, the authors shall send the form of Letter-transfer of Property Rights for the first publication duly filled in and signed by the author(s). This form must be sent as a PDF file to: ciencia.forestal2@inifap.gob.mx
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 International license.
