Ph.D. Tezi Görüntüleme | |||||||||||||||||||||
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| Summary: This study aimed to develop stand yield model and individual tree growth model for scots pine and oriental beech mixed stands in Black Sea Region. The data were obtaited from 162 temporary sample pots with ranging stand ages, site index, density and mixture percentage. Stem analysis data were collected from 381 stem analysis of dominant and co-dominant trees including 187 scots pines and 194 oriental beechs. Also, site index models and mortality models were developed for both species mixtures. Stand yield model were assessed as Density-Variable Yield Table used for estimation of remaining, removal and total stands. The results show that four parameter Johnson SB function for both scots pine and oriental beech is the best successful function to describe diameter distributions based on error index values calculated by difference between observed and predicted diameter distributions. While the coefficients of determination (R2) values for distance-independent diameter growth model for scots pine and oriental beech were 0.60 ve 0.67, respectively, for distance-dependent diameter growth model were 0.69 ve 0.72, respectively. The best results were obtained with an generalized algebraic difference equation (GADA) derived from the base model of Hossfeld for both species. The diameter growth model and mortality model were considered to have an appropriate level of reliability for scots pine and oriental beech mixed stands.
Key Words : Mixed stands, Density-Variable Yield Table, Individual tree growth model, Mortality model, Diameter distribution | |||||||||||||||||||||