Explanation of Spatial Pattern of Species (Quercus persica J. & Sp.) In Zagros Vegetative Zone Using the O-ring Statistics

Nowadays, for management planning and ecological studies, it is important to know the distribution of the people of the community, and it will be difficult to implement any program without the spatial information and distribution pattern of individuals in the communities. The spatial pattern of trees is analyzed in a sample plot of forest masses that has a definite shape and size, and the location of the trees is recorded,The spatial distribution of Iranian oak species trees plays an important role in the dynamics of the canopies of the western forests of the country and their optimal management. In general, the spatial distribution of phenomena is divided into three random, regular and cluster modes. The forest has two horizontal and vertical structures that define the horizontal structure of the surface distribution of trees in the forest area and the vertical structure of the height distribution of trees in the forest mass. One of the important characteristics of forest masses is the distribution and distribution of trees horizontally. Iranian oak is one of the main species of Zagros forests. Therefore, recognizing the distribution pattern of this species can be one of the important factors in preserving, rehabilitating and developing forests of the region.

In line with this research, the area of 30 hectares was selected from Watershed forests in the west of Lorestan province, in Kohdasht city. To conduct field operations by separating each hectare from the area of the study area in a sample of one hectare sample, based on the complete sampling, the diameter of each tree was measured. Then, by determining the initial station at the surface of each sample plot and measuring its geographical coordinates using the geo positioner, the coordinates of all the different bases of the species were determined by measuring the azimuth distance of the trees based on Cartesian trigonometric calculations. Then the trees measured on the basis of the diagonal diameter were divided into three low-diameter classes, between diameter and diameter. Investigation of spatial pattern of Iranian oak trees with one-variable function of Oring statistics.

The results showed that the spatial pattern of the trees due to the creation of the group and the increase of the density and density of the most branched species in comparison with the grazed species at short distances from the base tree (usually 20-25 m), and then with the scale enlargement in some directions Geographic areas (north and northwest directions) are monotonous due to human intervention and the removal of regeneration with grazing livestock.

Considering that in most of the studied area, the distribution pattern is cluster type, therefore, management plans and forestry interventions should be oriented so that the pattern of distribution towards the cluster pattern is driven. The results can be useful in designing planting patterns.