Abstract
Most managed forests are conveniently subdivided into a discrete number of geographical units known as stands. A stand may be even-aged or uneven-aged, depending on the type of management history. An even-aged stand is characterized by one age, which facilitates modelling its development. Even-aged stands are usually, though not always, more uniform with regard to the distribution of tree diameters and heights.
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Notes
vide Schumacher (1939). In Eastern and Central Europe the Schumacher-function is known as the Michailoff function, according to Michailoff (1943).
The height range is subdivided into a number of equally wide sections; in Germany this technique is known as the Streifenverfahren (Baur, 1877; Sterba, 1991, p. 71).
with α0=(19.962), α1=(-0.02642) and α2=(l/0.46) for SI1∞=17 and α0=(31.83), α1=(-0.03431) and α2=(1/0.3536) for S1,∞=29.
Height curves are not always disjoint as will be shown in the next section.
The coefficient of determination is a ratio indicating how the model compares with a simple average (R2=0) and with the perfect fit (R2=l). It is given by R2=l-RSSn/RSSM where RSSm is the residual sum of squares of the model and RSSn is the residual sum of squares about the mean. A high R2 does not necessarily mean that the model is the best possible one, nor that it will provide good predictions.
Class 3: weakly co-dominant; class 4:suppressed; class 5: completely suppressed.
Class 1: dominant with exceptionally large crowns; class 2: co-dominant with well developed crowns.
The degree of stocking is the basal area per hectare expressed as a proportion of some normal basal area, defined by a yield table.
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© 1999 Springer Science+Business Media Dordrecht
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Von Gadow, K., Hui, G. (1999). Modelling stand development. In: Modelling Forest Development. Forestry Sciences, vol 57. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4816-0_3
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DOI: https://doi.org/10.1007/978-94-011-4816-0_3
Publisher Name: Springer, Dordrecht
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Online ISBN: 978-94-011-4816-0
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