The Influence of Competition on some Structural Features of Persian Oak (Quercus brantii Lindl var.persica) Trees in Zagros Forest  (Case study:Hashtad- Pahlu,Lorestan)

Abrari Vajari, Kambiz; Jahanpour, Farhad; Amolikondori, Alireza

doi:10.52547/ifej.10.19.32

Volume 10, Issue 19 (5-2022) Ecol Iran For 2022, 10(19): 32-38 | Back to browse issues page

‎ 10.52547/ifej.10.19.32

‎ 20.1001.1.24237140.1401.10.19.11.6

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Abrari Vajari K, Jahanpour F, Amolikondori A. (2022). The Influence of Competition on some Structural Features of Persian Oak (Quercus brantii Lindl var.persica) Trees in Zagros Forest (Case study:Hashtad- Pahlu,Lorestan). Ecol Iran For. 10(19), 32-38. doi:10.52547/ifej.10.19.32
URL: http://ifej.sanru.ac.ir/article-1-423-en.html

The Influence of Competition on some Structural Features of Persian Oak (Quercus brantii Lindl var.persica) Trees in Zagros Forest (Case study:Hashtad- Pahlu,Lorestan)

Kambiz Abrari Vajari ^*¹, Farhad Jahanpour², Alireza Amolikondori³

1- Department of Forestry, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, I.R. Iran
2- Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, I.R. Iran
3- Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, I.R.

Abstract: (2879 Views)

TExtended Abstract

Introduction and Objectives: The growth of forest trees is controlled by various components. One of the main factors determining the structure and composition of the forest is the competition between the trees and competition involves complex relationships that depend on the pattern of tree distribution, the availability of resources, and the efficiency of resource utilization. Therefore, knowledge of tree competition mechanisms is ecologically and economically important. The purpose of this study was to determine the correlation between competition index and some characteristics of Persian oak (Quercus brantii Lindl var.persica) in Hashtad-Pahlu, Khorramabad.

Material and Methods: A total of 30 Oak trees were selected randomly in different aspects. Height, DBH and crown diameter were measured. Beneath their crown in two aspects (north-south) at a distance of one meter from trunk, fine roots sampling (60 samples) was performed at 0-30 cm depth.

Results: The result of analysis of variance showed that there was a significant difference between the value of competition index for Iranian oak species in different ranges (Sig = 0.000) so that the highest average value of this index was related to the northern exposition. Significant difference was observed for competition index in diameter class but no difference in height class. With increasing crown diameter, DBH and decreasing height/DBH ratio as well as crown diameter / DBH, competition index values increased and decreased respectively. Correlation showed that with increasing crown diameter and DBH, competition index value increased and with decreasing height / DBH ratio as well as crown diameter / DBH index value decreased. Results revealed the significant differences for trees in terms of crown diameter, DBH, height / DBH ratio and crown diameter/DBH ratio in aspects. Pearson correlation coefficients showed that there was a significant negative correlation between competition index and carbon biomass of Persian oak fine roots.

Conclusion: The difference between the competition index in the height and diameter classes of Persian oak trees indicates the importance and role of these two important characteristics in estimating it and also the difference in the competitiveness of trees in different stages of forest stand development. The results showed that light-demanding Oak trees based on various site conditions differ in terms of competitiveness and some characteristics in different positions.