بررسی تغییرات اقلیم بر روند خشکیدگی بلوط در استان کرمانشاه (مطالعه موردی روستای کله زرد)

decline in Zagros forests (Quercus sp) cause imbalance in land resources, following by the destruction of land resources, the increase of microstates, soil erosion, flood, climate change and poverty of local communities. Therefore, it is necessary to investigate the these factors and its trend for drying control. This research was conducted on forest lands of Kaleh Zard ,Kermanshah,using IRS satellite imagery (Pan) during the years 2006 to 2017. The purpose of this research is to investigate the rootstock drying phenomenon, especially oak trees, in the area. To do this research, at first, the degradation status of the forest bases was identified in the research area and using accurate GPS, determine the position of one hundred feet of dried earth on the ground and the coordinates of these points were transmitted over time series images of the IRS munitions to determine the zoning of the damping. he precipitation and temperature conditions were studied in a 60-year period. The results indicated that die-back phenomenon has been occurred since 2006. The severe die-back reached to 21.8 % during first period (2006-2011). Furthermore, field verification showed that the drying trend decreased in tree percent soddenly in 2017 due to relatively proper rainfall. The study of meteorological data indicates a decrease in the ice age, snowfall, and an increase in the average temperature in the area, which is a factor in the intensification of drying. However, improper management of degraded forest promote die-back incidence.