Groei en productie van Corsicaanse den in Nederland

In the Netherlands, growth and yield research on Corsican pine was done from 1925 to 1990. 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 193 plots with 869 recordings. For the development of top height htop over age (t), Jansen & Hilde-brand’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 Gompertz function 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 density index of Hart (S %). For S % > 22.4 the basal area increment drops with increas-ing S %. The year of recording in relation with Brunchorstia dieback was also included in the model. 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 meas-ured stand development reasonably well. The model was used to construct yield tables with seven site classes and six thinning intensities.