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A generalized nonlinear mixed-effects height-diameter model for Eucalyptus globulus L. in northwestern Spain
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Orientador(es)
Resumo(s)
A generalized height–diameter model was developed for Eucalyptus globulus Labill. stands in Galicia
(northwestern Spain). The study involved a variety of pure stands ranging from even-aged to unevenaged.
Data were obtained from permanent circular sample plots in which trees were sampled within
different radii according to their diameter at breast height. A combination ofweighted regression, to take
into account the unequal selection probabilities of such an inventory design, and mixed model
techniques, to accommodate local random fluctuations in the height–diameter relationship, were
applied to estimate fixed and random parameters for several models reported in the relevant literature.
The models that provided the best results included dominant height and dominant diameter as fixed
effects. These models explained more than 83% of the observed variability, with mean errors of less than
2.5 m. Random parameters for particular plots were estimated with different tree selection options.
Height–diameter relationships tailored to individual plots can be obtained by calibration of the height
measurements of the three smallest trees in a plot. An independent dataset was used to test the
performance of themodel with data not used in the fitting process, and to demonstrate the advantages of
calibrating the mixed-effects model.
Descrição
Palavras-chave
growth model random effects calibration unequal selection probabilities weighted regression Tasmanian blue gum
Contexto Educativo
Citação
"Forest Ecology and Management". ISSN 0378-1127. 259 (2010) 943-952