Groei en productie van Amerikaanse eik in Nederland
In the Netherlands growth and yield research on red oak was done from 1949 to 1988. This includes studies by Becking and by the Dorschkamp/IBN research institute. Together with the perma-nent sample plots from the timber prognosis system HOSP, all this comprises a dataset of 58 plots with 306 recordings. For the development of top height htop with age t, Jansen & Hildebrand’s poly-morphic model with site index h70 and three additional parameters fitted best.The diameter development up to stand height of 7 m was described with a linear function in htop and initial density (N0). From a stand height of 7 m and up, the basal area increment (iG) was described by Jansen’s et al. model based on a power function with htop, t, year of recording (yor), and the stand density index of Hart (S %). For S% > 19.1 the basal area increment drops strongly non-linear with in-creasing S%. The model contains a correction factor for yor, which was not significant. The effect of thinning on the diameter after thinning, was modelled with a modified La Bastide-Faber model. The model was used to construct yield tables for with five site classes and one thinning intensity
| Main Authors: | , , , |
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| Format: | External research report biblioteca |
| Language: | Dutch |
| Published: |
Wageningen University & Research
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| Subjects: | Life Science, |
| Online Access: | https://research.wur.nl/en/publications/groei-en-productie-van-amerikaanse-eik-in-nederland |
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| Summary: | In the Netherlands growth and yield research on red oak was done from 1949 to 1988. This includes studies by Becking and by the Dorschkamp/IBN research institute. Together with the perma-nent sample plots from the timber prognosis system HOSP, all this comprises a dataset of 58 plots with 306 recordings. For the development of top height htop with age t, Jansen & Hildebrand’s poly-morphic model with site index h70 and three additional parameters fitted best.The diameter development up to stand height of 7 m was described with a linear function in htop and initial density (N0). From a stand height of 7 m and up, the basal area increment (iG) was described by Jansen’s et al. model based on a power function with htop, t, year of recording (yor), and the stand density index of Hart (S %). For S% > 19.1 the basal area increment drops strongly non-linear with in-creasing S%. The model contains a correction factor for yor, which was not significant. The effect of thinning on the diameter after thinning, was modelled with a modified La Bastide-Faber model. The model was used to construct yield tables for with five site classes and one thinning intensity |
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