Die Waldschaeden und die Ertragsregelungsprobleme : Oekonomische Bewertung von Waldschaeden infolge von Luftverunreinigungen. Proceedings

1989

S. 191- 198

2 Abb., 1 Tab., 10 Lit. Ang., De, Zfsg. En

Unselbständiges Werk

200022167

Titel of the paper: Forest Damages and the Problems of Regulation of Cut. The methods for the regulation of cut are commonly based on the theory of (normal forest). The theory assumes that probability of transition of forest stands from lower to higher age-classes is deterministic and equal 1. In fact, however, e.g. due to aif pollution, excessive self-thinning occurs. The nature of this phenomenon os stochastic. These assumptions gave a basis for ghe known probebilistlic model of (goal forest). An essential element of the model is the function of transition of forest stands (A) in relation to their age (t). This function allows determination of the fraction of forest stands for a given rotation age (tu): see formula 4). Having in addition the function of annual increment (Fb), it is possible to define the new function, which maximizes production with respect to the area of fraction of age tu: (see formula 5). A solution of this equation gives the following condition for the optimum rotation age in the (goal forest) (for t = tu): (see formula 5). A solution of this equation gives the following condition for the optimum rotation age in the (goal forest) (for t = tu):(see formula 7). Thus, for age tu the rates of increase of total growth function (F) and the function of transition of forest standes (A) are equal fraction for this age. In case of normal forest A(t) = constans thus, Ab (t) = O and Pz = 1/tu and Fb = (Fp - mean total increment).