Groei en productie van Oostenrijkse den in Nederland

In the Netherlands, growth and yield research on Austrian pine was done from 1925 to 1990. This include studies by the Dorschkamp/IBN research institute. Together with the permanent sample plots from the timber prognosis system HOSP, all this comprises a dataset of 117 plots with 486 recordings. For the development of top height htop over age (t), Jansen & Hildebrand’s model with asymptote and 3 additional parameters fitted best. As site index, top height at 50 year (h50) was chosen. The diameter development up to stand height of 7 m was best described with a power func-tion based on htop, the density after refinements (NR), and h50. From a stand height of 7 m and up, the basal area increment (iG) was best described by a power function based on htop, t, and the stand den-sity index of Hart (S%). For S % > 28.7 the basal area increment drops with increasing S %. The effect of thinning on diameter after thinning was modelled with a modified La Bastide-Faber model. With all models together, a stand projection model was constructed, which follows the measured stand development reasonably well. The model was used to construct yield tables with seven site classes and six thinning intensities.