Predictive equations of some stand characteristics for Pinus brutia Ten. in Zawita and Atrush districts
Other Title(s)
النماذج التنبؤية بين القطر، الارتفاع، قطر و تاج و العمر لأشجار Pinus brutia Ten. في منطقتي زاويته و أتروش
Author
Source
Issue
Vol. 18, Issue 1 العلوم الزراعية و البيطرية (30 Jun. 2015), pp.169-178, 10 p.
Publisher
Publication Date
2015-06-30
Country of Publication
Iraq
No. of Pages
10
Main Subjects
Abstract EN
This study was done on 200 trees of natural pine stands (Pinus brutia Ten.) located in Zawita and Atrush district in Duhok province in northern Kurdistan region of Iraq.
The paper presents the analysis of some characteristics of tree, following elements were analyzed: diameter at breast height (D), tree height (H), crown diameter (CD) and age of tree at breast height (A).
We discuss the approaches of equations in order to establish the relationships between tree height with diameter at breast height (H-D), crown diameter with diameter at breast height (CD-D), age of tree at breast height with diameter at breast height (A-D), and age of tree at breast height with crown diameter (A-CD).
Regression analysis were applied, one linear and seven non-linear functions were selected for each of these relationships, and then were compared between these equations in order to choose the best fit equation by examining the adjusted coefficient of determination (R2 adj.), Standard error of estimated (SE.
of Est.) and the mean square error (MSE).
The results of the study indicated that the (H-D), (CD-D), (A-D) can be described by cubic function, except the relationship between (A-CD) can be described by quadratic function.
American Psychological Association (APA)
Ubayd, Muhammad Hidayat. 2015. Predictive equations of some stand characteristics for Pinus brutia Ten. in Zawita and Atrush districts. Journal of Dohuk University،Vol. 18, no. 1 العلوم الزراعية و البيطرية, pp.169-178.
https://search.emarefa.net/detail/BIM-799803
Modern Language Association (MLA)
Ubayd, Muhammad Hidayat. Predictive equations of some stand characteristics for Pinus brutia Ten. in Zawita and Atrush districts. Journal of Dohuk University Vol. 18, no. 1 Agricultural and Veterinary Sciences (Jun. 2015), pp.169-178.
https://search.emarefa.net/detail/BIM-799803
American Medical Association (AMA)
Ubayd, Muhammad Hidayat. Predictive equations of some stand characteristics for Pinus brutia Ten. in Zawita and Atrush districts. Journal of Dohuk University. 2015. Vol. 18, no. 1 العلوم الزراعية و البيطرية, pp.169-178.
https://search.emarefa.net/detail/BIM-799803
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 176-177
Record ID
BIM-799803