Diameter Distribution of Bornmullerian Fir in Mixed Stands

Abstract

The diameter distribution is one of the most powerful tools for depicting the properties of astand. Diameter has generally strong correlations with other important stand variables includingbasal area, volume, etc. Quantification of the diameter distribution and its relationship to site,stand composition, age, and density is often valuable for both economic and biologicalpurposes. In this case, the diameter distribution of stands should be determined with appropriateprobability functions for all these purposes firstly. In this paper, we consider four probabilitydensity functions (Exponential, Exponential with two parameters, Weibull with two parametersand Weibull with three parameters) as diameter distribution models for Bornmullerian fir (Abiesnordmanniana subsp. bornmulleriana) in mixed coniferous stands.