Investigation of some ecological characteristics of medicinal and endangered Thymbra spicata in Ilam Province

This study investigated some characteristics of Thymbra spicata habitats in three areas of Tange bina, Telume and shirpaneh in Ilam province. Geomorphological characteristics of the areas investigated by satellite vision and feild survey. To detemine climate characteristics and bioclimate division of each area, climate parameters using nearest meteorology station and methods of demarton and Amberge were used respectively. Edaphic characteristics such as soil texture, Ec, PH, Na and organic matter were measured. Companion species, phonology and biometric characteristics of Thymbra spicata population were also investigated. Results showed that Shirpane have Asmari formation and two others area have Gachsaran formation. The areas had the average rainfall between 200 to 408 and the average of relative humidity were between 25 -40. Based on Amberge method the climate was hot desert to moderate arid and moderate semiarid. The soil of the area was loamy-sand with high amounts of lime and with low salinity and organic matter. The habitats of Thymbra spicata had 45 acompany species that they were belong to 27 plant familly. The density, average hight and average coverage of Thymbra spicata was measured between 192-1179 plant, 13-22 Cm and 195-447 cm2 respectively.