Study of Frequency of Oak Tree Drying Zones In Physiographic Units and Landuse of Middle Zagros Region (Ilam Province)

Changes in vegetation and land use have been unprincipled on the one hand, and the occurrence of tree decay in the last decade, on the other hand, has put additional pressure on the forests of the Zagros, causing significant significant drying of these forests in particular. It is located in Ilam province. Since awareness of the extent and location of deforestation and spatial distribution of areas at risk of destruction and prevention of this growing trend is the concern of planners and managers of the natural resources sector, the need for sustainable management of these valuable resources is easy access to information and data. The day is high. Therefore, the present study aimed to investigate the distribution of oak tree drying zones in physiographic units (slope, slope direction and elevation classes) as well as land use using geographical information system in this province.

In this study, first, using Alos and Srtm elevation models, in the GIS environment, slope information layers were extracted for slope and elevation classes. Then, based on satellite images and field control, the land use layer of the province was prepared. Also, using the GPS device, the position of the dried oak trees was determined and the relevant dotted layer was prepared. Then, by combining the prepared information layers (slope, slope direction, height floors and land use) with the location layer of dried oak areas, the frequency of tree drought zones of oak forests in physiographic and land use units is determined and examined. Took

According to the results, the drought rate of trees in topographic units (slope, slope direction and elevation classes) extracted from two models is also 12 meters and Srtm is 50 meters. Percentage (30%). 18% is for the northeast slope and 47% is for the 2000-1500 m high floor. Also, according to the Srtm model, the highest frequency of dried oak areas is related to the slope class of 10-20% (30%), 20% is related to the northern slope direction and 47% is related to the altitude of 2000-1500 meters. In terms of land units, most of the dried areas of oak trees are located in mountainous areas, hills, pebbled areas and plateaus, respectively.

In general, there is no difference between the percentage distribution of oak drying with slope classes in the two models studied. However, there are slight differences in the height of the floor and the direction of the slope in both models. In terms of forest use, the highest frequency of oak drying is in low (36.5%), medium (33.9%) and high (4.4%) classes, respectively.