Journal article

Modelling and prediction of dominant height and site index of Eucalyptus globulus plantations using a nonlinear mixed-effects model approach

Yue Wang, Valerie M Lemay, Thomas G Baker

CANADIAN JOURNAL OF FOREST RESEARCH | CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS | Published : 2007

Abstract

A nonlinear mixed-effects model approach was used to model dominant height and site index for Eucalyptus globulus Labill. plantations in southeastern Australia. Mixed effects were considered initially for all three parameters of a modified Chapman-Richards model. Inclusion of random effects improved fitting and accounted for the within-plot heteroscedasticity. To correct for within-plot autocorrelation, a power autocorrelation model allowing for irregular intervals for remeasurements was found to be most appropriate. Additional fertilizer application at age 1 year and a number of environmental variables were related to the fixed-effects parameters, but these were not statistically significan..

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University of Melbourne Researchers