Among the various destruction factors of forests and grasslands, fire is considered dangerous and cause different effects depending on conditions of fire on the physical, chemical and biological soil properties. Each year many area of world's forests and grasslands are burned in fire, which leads to destruction of vegetation and disturbs the hydrological processes, increasing soil erosion and runoff generated from these areas. Fires in forests and pastures of Iran that have different climates and vegetation occurs mostly by humans and intentionally. According to available statistics, between 1991 and 1997, more than 3000 fire events occurred, which affects 13700 acres of land natural resources to be burned. This study aimed to evaluate the residual effects of fire on soil physical and chemical properties in the Frieden pastures (Central Zagros, Iran). Experiment was conducted in a randomized complete block design. The primary particle size distribution and texture, lime, density, pH, electrical conductivity, organic matter, sodium, potassium, calcium and magnesium, sodium adsorption ratio (SAR) and phosphorus, iron, manganese, zinc and soil microbial respiration were measured by conventional methods. The results showed that the fire had a significant effect on some chemical properties of soil and soil texture Key words : Friedan Pasture, Fire, Residual effects, Vegetation, Physical and Chemical Properties.
