Zur Relevanz von Modellen der intertemporalen Ressourcenökonomie für die finanzielle Analyse naturnaher Waldformen

2002

S. 654-659

13 Lit. Ang.

Unselbständiges Werk

200095024

Owing to the enjoyable dedication of silvicultural investigations to the issue of efficiently treating close-to-nature forms of forest management by the help of economic models the question for the relevance of economic models to be used for this purpose is shifted more into the focus again. In particular, in this connection besides the forest-economic FAUSTMANN model the fishery model from the domain of resources economics is under discussion. As both models lead to different results of financial optimal stand densities in close-to-nature systems of management, they are compared in this contribution. Following a brief description of both models their so-called hidden assumptions are elucidated. In this regard it becomes obvious that the FAUSTMANN model is constructed exlcusively on age-dependence and the fishery model exclusively on density dependence. Subsequently, proceeding from four forest states of affairs the expressiveness of both models is examined. Each of the both models proves to have deficiencies in reflecting close-to-nature systems of forest management. Although stand density undoubtedly affects value increase of uneven-aged forest stands, value increase of trees however is mainly an agedependent process. Hence, the forest-economic questioning cannot be "how mch volume is to be removed", but "which trees are to be removed". In this context, the financially optimal stand volume is obtained indirectly by removing all trees the rate of return on investments of which does no longer correspond to the necessary interest rate. The rule for this decision is taken from this FAUSTMANN-PRESSLER-OHLIN theorem derived from the FAUSTMANN model. Stand density as influential variable can be taken into account in the modeling by a single step through the cohort assumption borrowed from fishery economics.