Structure and spatial distribution pattern of tree communities of Juniper (Juniperus foetidissima Willd) in Arasbaran region

Due to the sensitivity and specialty of the species presence of Juniper (Juniperus foetidissima Willd.) in Arasbaran forest site, the study of the structure of Juniper stands using structural indicators can help to better management of this species. The main objective of this research is to investigate the spatial structure of this species in order to investigate the quantitative status of the Arasbaran region. Eight samples of one hectare were inventoried with two methods; full callipering and the nearest neighbors. Some characteristics were computed such as diameter at breast height (dbh), height, distance and angle of trees from each other and reference tree. The Structural indices were computed such as uniform angle index, distance to neighbor (Di), diameter (TDi) and height differentiation (HDi). The results showed that the juniper species has formed a pure stand. The mean values of the uniform angle index and Di were 0.24 and 4.6 meters, respectively. Also, the mean TDi and HDi indices were estimated 0.01 and 0.07, respectively. At the sample plots, about 53% of the trees had an average tree distance of less than four meters. In two indices of TDi and HDi, about 90% of the trees in the study area had a difference of less than 0.3 relative to neighbor trees. It can be concluded that the studied stands are pure, homogeneous and relatively young. Such information can be used as a prerequisite for better ecosystem management and conservation activities.