an investigation on the effect of fire in short time on growth form and palatability classes in zagheh rangelands

fire consider as a factor and basic management in rangeland in order to reform of composition and biological diversity that use in rangeland ecosystems. this project was established to deal with the effect of fire in the research center for rangeland. zagheh locale where is in 35 km of north eastern of khoramabad with 1960 meters above sea level. the average comparison and analysis show that herbal forbs which use for grazing form density and average o canopy cover have significant difference at the level of %1 between fire and control area. (p < %1). this study shows that in short time, it is possible to replace perennial. the prevailing type of grass such as agropyron trichophorum - bromus tomentellus and festuca ovina with annual grass like bromus tectorum –heteranthelium piliferum- taeniatherum crinitum. these changes indicate perennial grasses and increased annual grasses in short time.