Fitting of diameter distribution using some statistical models (distributions)(Case study: Khyroudkenar forest, Noshahr)

• Main Authors: Khosro Mohammadalizadeh, Mahmoud Zobeiri, Manouchehr Namiranian, Abdolhosayn Hoorfar, Mohammad Reza Marvie Mohajer
• Format: Article
• Language: fas
• Published: Research Institute of Forests and Rangelands of Iran 2009-03-01
• Series: تحقیقات جنگل و صنوبر ایران
• Subjects: dbh; exponential distribution; gamma distribution; lognormal distribution; uneven- aged stands; Khyroudkenar forest
• Online Access: http://ijfpr.areeo.ac.ir/article_107901_68e7457756a408fee77d68a683868862.pdf
• ISSN: 1735-0883; 2383-1146

In order to study dbh distribution of trees in uneven- aged stands and fitting tree diameter using statistical distributions, data of Gorazbon district of Khyroudkenar forest were used. 196 trees were selected randomly as sample and their dbh were analyzed. After basic calculation, three distribution: Exponential, Gamma and Lognormal were used to fit on dbh data. Results of Chi-Square and Kolmogorv-Smirnov tests showed that Exponential distribution can not determine diameter distribution of trees, and between two others, the Gamma is more appropriate