Influences of determined and estimated dendrometric variables on the precision of volumetric modelling

The use of independent variables in volumetric modelling is an important step in fitting models to represent tree or stand characteristics. The DBH measured at 1.3 m from the ground level and total tree height (Ht) are the most commonly used independent variables when modelling individual tree volum...

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Bibliographic Details
Published in:Journal of forest science (Praha) 2021-01, Vol.67 (12), p.553-561
Main Authors: Aleixo da Silva, José Antônio, Caraciolo Ferreira, Rinaldo Luiz
Format: Article
Language:English
Subjects:
adjusted height
Arid regions
Arid zones
Diameters
Error analysis
estimated height
Eucalyptus
Ground level
hypsometric relationships
Independent variables
Mathematical models
Modelling
Semi arid areas
Semiarid zones
tree volume
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Summary:The use of independent variables in volumetric modelling is an important step in fitting models to represent tree or stand characteristics. The DBH measured at 1.3 m from the ground level and total tree height (Ht) are the most commonly used independent variables when modelling individual tree volumes. This work aimed to analyze the importance of independent variables in fitting and selecting volumetric equations. A total of 750 trees from an experiment with three Eucalyptus spp. clones planted in five spacings in the semi-arid region of Pernambuco were used. Four statistical procedures were applied to compare the equations: Adjusted Fit Index (AFI), Akaike information criterion (AIC), mean absolute percentage error (MAPE), and a completely random design having the real tree volume as control and the fit equations as treatments. The error measuring heights in the field (EH) was also analyzed. Four heights were evaluated: Ht, height estimated in the field (He) and heights adjusted (Ha) from hypsometric relationships using the DBH [Ha (a)] and D1.7 [Ha (b)], which was the diameter most correlated with the volume. The result indicates that all 18 fitted models provided high precision volumetric equations which do not differ at the 5% significance level.
ISSN:1212-4834
1805-935X
DOI:10.17221/105/2021-JFS