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Bertalanffy-Pütter Models for the Growth of Tropical Trees and Stands

The 
Bertalanffy-Putter (BP) five-parameter growth model provides a versatile 
framework for the modeling of growth. Using data from a growth experiment in 
literature about the average size-at-age of 24 species of tropical trees over 
ten years in the same area, we identified their best-fit BP-model parameters. 
While different species had different best-fit exponent-pairs, there was a 
model with a good fit to 21 (87.5%) of the data (“Good fit” means a normalized 
root-mean-squared-error NRMSE 
below 2.5%. This threshold was the 95% quantile of the lognormal distribution 
that was fitted to the NRMSE 
values for the best-fit models for the data). In view of the sigmoidal character of this model 
despite the early stand we discuss whether the setting of the growth experiment may have 
impeded growth.