Groei en productie van ruwe berk in Nederland
In the Netherlands growth and yield research on silver birch was done from 1982 to 1994. This includes studies by the Dorschkamp/IBN research institute and by Wageningen University. To-gether with the permanent sample plots from the timber prognosis system HOSP, this comprises a dataset of 43 plots with 132 recordings. For the development of top height htop with age t Cieszewski’s polymorphic model with site index h50 and three additional parameters fitted best.The diameter at a height of 7 m (d7) was estimated with the plot data and with the data of the Fourth National Forest Inventory, and the average of both estimates was chosen. The diameter develop-ment up to stand height of 7 m was described with a model of Jansen et al., a power function in htop and the estimated value for d7. From a stand height of 7 m upwards, the basal area increment (iG) was also described by Jansen’s et al. model based on a power function with h50, t, year of recording (yor), and the stand density of Hart (S %). For S% > 19.5 the basal area increment decreases non-lin-ear with increasing S %. The model contains a correction factor for yor, although this was not signifi-cant, as the year of recording (yor), turned out to be not significant. The effect of thinning on the di-ameter after thinning was modelled with the La Bastide-Faber model.The models were used to construct a yield table with five site classes and one thinning intensity.
| Main Authors: | , , , |
|---|---|
| Format: | External research report biblioteca |
| Language: | Dutch |
| Published: |
Wageningen University & Research
|
| Subjects: | Life Science, |
| Online Access: | https://research.wur.nl/en/publications/groei-en-productie-van-ruwe-berk-in-nederland |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|