Groei en productie van zomereik in Nederland

In the Netherlands growth and yield research on common oak was done from 1947 to 2004. This includes studies by Becking and by the Dorschkamp/IBN research institute. Together with the permanent sample plots from the timber prognosis system HOSP, all this comprises a dataset of 87 plots with 434 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 diameter 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 another model by Jansen et al. based on a power function with htop, age, year of recording (yor), and the stand density of Hart (S %). For S% > 21.8 the basal area increment drops strongly with increasing %. The model contains a correction factor for yor; for the period since 1981, this factor is 15 % above the level of the period 1934 until 1980. 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 constructed, which describes the measured stand development reasonably well. The model was used to construct yield tables for with five site classes and five thinning intensities.