Study on the Autecology of Bromus tomentellus in Esfahan province.

Autecologic studies of plants especially in range lands give us valuable information about both relations among them and with environment also. These information help us particullarly in range management. In this way one of these plants as Bromus tomentellus Boiss. Has been studied in Esfahan province. The studied cases are topographjc,Climatic & soil Condition and dispersion actually ecologic fromtiers of its presence and etc. This specimen belonges to Gramineae (Poaceae) family. It is herbaceous, perennial, with culms 50-70cm tall, enveloped at the base by reticulate and fibrillouse dead sheaths, ligule short, panicule erect 9-10 cm long. Spikelets pale, 6-10 flowered 305-5 cm long. The awn 1-104 cm long. Dispersion: It has persence in west and middle Asia in Lebanon, Iraq, Turkey, Azarbayejan, Armenia and Afghanistan. In Iran mostly in semi Steppic Zones of IranoTourani area in northern and central provinces like khorasan, Golestan, Mazandaran, Azarbayejan, Kordestan,Kermanshahan,Lorestan,Zanjan,Hamadan,Ghazvin,Tehran,Markazi,Esfahanand Yazd . In Esfahan it is in montainous areas at abuot 1900- 3700 meters height of Semirom, Fereidan, Feridounshahr, Khansar, Golpayegan,Meimeh, Natanz, Kashan and Northwest of Naien. Climate: It grows in cold to temperate zones with abuot 200-400 mm rain fall and has tolerance to changes of temperature of about –20 to +40oc. Soil: The most Types of soil textures that it is observed on them are medium to heavy ones with elecrical conduclivity about 0.3- 0.5 ds/m and ph about 7-7/5. Land units: mostly on montains, hills, plateus, montainous plains. Companion plants: mostly are Astragalus spp., stipa spp., Agropyron spp., Ferula Ovina, Artemisia spp., Eryngium billardieri, Daphne mucronata. Phenology: : This plant starts new growing in about March. has flowering about May and seeding in about June. The preference value: in studied areas this parameter is about 10-40 percent.