Application of probability distributions in order to fit canopy classes of Quercus brantii trees, Case Study: Dalab forests of Ilam

Document Type : Research Paper

Authors

1 Ph.D. Student, Faculty of Natural Resources, University of Guilan, Iran

2 Associate Professor, Faculty of Natural Resources, University of Guilan, Iran

3 M.Sc. graduated, Faculty of Natural Resources, University of Guilan, Iran

Abstract

Determining the fitting pattern of canopy classes in Zagros forests shows that at different times, the  overall  status  of  these  forests  from  the  destruction  process  and  ecological sequence points of view. The aim of this research was to investigate crown canopy classes probability distribution of Quercus persica trees in Dalab forests of Ilam. For this purpose, an area of 37.2 hectares in Ilam forests was selected, and based on systematic random pattern 37 transects with fixed length were measured. Finally, the numbers of 209 trees were selected. Exponential, Gamma, Normal and Log-normal probability distribution functions were fitted to crown canopy classes. Characteristics of distribution function by using of maximum likelihood method was estimated. Actual probability and probability which derived from functions was compared using Kolmogorov-Smirnov and Anderson-Darling tests. Results of fitting tests and P-P plots showed that Normal distributions is the best probability distributions for modeling distribution in crown canopy classes of oak trees.  

Keywords

Forest Sustainable Development
Volume 1, Issue 2 - Serial Number 2
August 2014
Pages 195-203

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