The Study on Some of Ecological Specifications of Gentiana olivieri a Medicinal Species in Rangelands of Fars Province, Iran

According to the importance of medicinal plants and the necessity of comprehensive understanding them for exploitaion; some ecological aspects of Gentiana olivieri plant that is from Gentianaceae family were reviewed. This study was done in 5 counties that were as the habitat of this plant. In first stage in each site physiognomy units were separated, and in each unit, one reagent zone was specified; and in each site, by random systematic method, 4 transect with 100 m length and along each of transect, 5 plots 2×2 were selected. And the data related to vegetation and soil were gathered. The obtained results showed that the factors such as: vegetation percent, density, abundance and the height of plant in different sites are affected by the factors related to soil. As the areas that had the most percent of sand and minimum percent silt, clay and EC had the minimum vegetation percent; and the areas having the most amount of K,OC and EC, had the most plant height and the areas having the maximum clay amount and pH had the minimum density and abundance and plant height. Meanwhile, the habitats of this plant were from 1600 to 2000 m from sea level and were as the relatively hillside lands with the slop less that 20 percent and in all geographical directions.