Wachstum und rechnerische Verschiebung des Mitteldurchmessers in selbstdurchforsteten Beständen

Tharandt

2010

S. 173-189

Artikel aus einer Zeitschrift

200170972

The development of stand mean values (e.g. mean diameter, mean height) results from two associated processes: Biological growth and a mere calculatory shift. In self-thinning stands, the latter results from the fact that the probability for a tree to die is not independent from the trees size. This is the reason why the development of stand mean values must not be treated as equal to the growth of a mean individual. This study tries based on the concept of Reineke's rule (REINEKE 1933) and long term self thinning plots in Norway spruce stands- to contribute to a quantitative understanding of the relation between diameter growth and calculatory shift. It can be shown, that Reineke's rule, which describes the allometric relationship of a stand's mean diameter and stem number, can be easily splitted into two compenents that relate growth and calculatory shift to stem number change separatedly. Data analysis reveals the non-trivial fact that both components represent allometric relationships, either. This means that the mean diameter's growth and calculatory shift show a constant ratio on the long run. Investigations with other tree species are necessary to scrutinize inhowfar the findings of this study can be generalized. If so, they will be helpful for scaling between tree and stand level, for analyzing the concept of species-specific self-tolerance sensu ZEIDE (1985), and they could form a useful limit relationship in growth models.