A generalized nonlinear mixed-effects height-diameter model for Eucalyptus globulus L. in northwestern Spain.

摘要: Abstract A generalized height–diameter model was developed for Eucalyptus globulus Labill. stands in Galicia (northwestern Spain). The study involved a variety of pure ranging from even-aged to uneven-aged. Data were obtained permanent circular sample plots which trees sampled within different radii according their diameter at breast height. combination weighted regression, take into account the unequal selection probabilities such an inventory design, and mixed techniques, accommodate local random fluctuations relationship, applied estimate fixed parameters several models reported relevant literature. that provided best results included dominant height as effects. These explained more than 83% observed variability, with mean errors less 2.5 m. Random particular estimated tree options. Height–diameter relationships tailored individual can be by calibration measurements three smallest plot. An independent dataset used test performance data not fitting process, demonstrate advantages calibrating mixed-effects model.