Groei en productie van beuk in Nederland

In the Netherlands growth and yield research on common beech was done from 1960 to 1992 at very small scale. This includes studies by Becking and by the Dorschkamp/IBN research insti-tute. Together with the permanent sample plots from the timber prognosis system HOSP, all this comprises a dataset of 47 plots with 169 recordings. For the development of top height (htop) with age (t) Cieszewski’s model with site index h70 and three additional parameters fitted best. The diame-ter development up to stand height of 7 m was described with the model by Jansen et al. based on htop and initial density (N0). From a stand height of 7 m and up, the basal area increment (iG) was also described by a model from Jansen et al., based on a power function with htop, t, year of recording (yor), and the stand density of Hart (S %). For S % > 17.6 the basal area increment drops strongly with increasing S %. The model contains a correction factor for yor, which unfortunately could not be esti-mated from the plot data. The effect of thinning on the diameter after thinning was modelled with a modified La Bastide-Faber model. With all models together, a stand projection model was con-structed, which describes the measured stand development moderately well. The model was used to construct yield tables for with five site classes and six thinning intensities