Kastamonu Yöresi Sarıçam Meşcereleri İçin Çap Dağılımlarının Modellenmesi ve Çeşitli Meşcere Özellikleri ile İlişkilerinin Belirlenmesi

Abstract

In this study, it was aimed to model the diameter distribution of Scots pine (Pinus sylvestris L.) stands in Kastamonu region. The effects of various stand characteristics (number of trees, mean diameter, stand density, site class, crown closure, developing stage and stand type) on the determination of the most appropriate distribution function were also investigated. 890 sample plot data obtained from the General Directorate of Forestry archive were utilized as study material, and Beta, Gamma (with 2 and 3 parameters), Johnson SB, Log-normal (with 2 and 3 parameters), Normal and Weibull (with 2 and 3 parameters) probability density functions were used to model the diameter distributions. Kolmogorov-Smirnov (KS), Anderson-Darling (AD), Chi-square (X2) and Error Index (e) criteria were used to determine the success of probability density functions and to decide the most appropriate ones. The effects of stand characteristics on the decision of the most suitable function were also determined by Kruskal-Wallis and Chi-square tests. As a result of comparisons, Johnson SB was determined as the most successful probability density function. While the success of the probability density functions was affected by the number of trees, mean diameter, crown closure, developing stage and stand type, it was not affected by stand density and site class.