Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 536817
Title Groei en productie van ruwe berk in Nederland
Author(s) Jansen, J.J.; Oosterbaan, A.; Mohren, G.M.J.; Ouden, J. den
Source Wageningen : Wageningen University & Research (FEM Groei en Productie rapport 2018-13) - 41
Department(s) Forest Ecology and Forest Management
Alterra - Nature and society
Publication type Research report
Publication year 2018
Abstract 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.
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