The effect of fire on some soil chemical properties of Bankool forests in Ilam province

Most of soil physical, chemical, mineral and biological attributes are changed by forest fires. Fire is one of the most important factors of forests destruction in Ilam region and considerable area of the region are annually exposed to fire. Depend on environmental conditions and also fire intensity, different effects will impose on ecological conditions of the environment. Whereas soil is considered as a base for forest’s growth and regeneration, study of fire effects on it’s properties takes an important place.Most of soil physical, chemical, mineral and biological attributes are changed by forest fires. Fire is one of the most important factors of forests destruction in Ilam region and considerable area of the region are annually exposed to fire. Depend on environmental conditions and also fire intensity, different effects will impose on ecological conditions of the environment. Whereas soil is considered as a base for forest’s growth and regeneration, study of fire effects on it’s properties takes an important place.Most of soil physical, chemical, mineral and biological attributes are changed by forest fires. Fire is one of the most important factors of forests destruction in Ilam region and considerable area of the region are annually exposed to fire. Depend on environmental conditions and also fire intensity, different effects will impose on ecological conditions of the environment. Whereas soil is considered as a base for forest’s growth and regeneration, study of fire effects on it’s properties takes an important place.This research was carried out on the effects of fire on soil chemical properties in the three intervals of one, two and three years after a fire. For this purpose, three regional forest fires have been selected considering the similarity in topography and geology conditions. A control region was also selected in the vicinity of the study area (no fire). 40 round sample plots of 100 m2 were taken to Bankool forests. soil samples from a depth of 0-5 cm were collected from below and outside of the crown trees in four study area. Some chemical properties of soil samples were measured. T-test results showed that there are significant differences between chemical variables under and outside crown in the first years of fire and four regions (p