Determination of spatial pattern and Interspecific competition in mixed yew stand in Afratakhteh Forest of Aliabad

The distribution pattern and the association of trees of different species have a direct correlation with the dynamics and tree species relationships in the forest ecosystems. The purpose of the present study was to determine the spatial pattern of Yew, Hornbeam and Oriental Hornbeam trees and also to analyze the competition between Yew trees with two other species in Afratakhteh yew reserve of Aliabad katul city. After the circling forest, intended stand selected and the location of the species was recorded using the TP360 Laser Rangefinder machine by distance and azimuth method. Overall of 366 yews, 47 hornbeams and 71 Oriental Hornbeams were measured. The results of Single variable pair correlation function showed that spatial distribution of three species follows a random pattern. Investigating the competition between species using a bivariate pair correlation function showed that there was no or no significant difference between yew trees and hornbeam trees and Oriental Hornbeams. Middle aged stand, Intra-specific competition and reaching the stage of puberty are important factors for the formation of a random pattern for three species of Yew, Hornbeam and Oriental Hornbeam. The optical nature of forest trees, the existence of different nutrition of different species trees and the growth of trees in steep and sloping arenas with different soil beds can be a reason for the absence of negative competition between species. Therefore, in order to revive this valuable species, must be tried The yew will be established in low-slope areas with great soil depth.