Study on Flora, Vegetation Structure and Chorology of Plants in Some Parts of Protected Area of Oshtorankooh, Lorestan Province

Plantation area of Zagros in west Iran is amongst the richest and most valuable interconnected ecosystems in Iran which contains enormous genetic and plant resources and it is of the significant importance in terms of diversity and combination of floristic. The Protection area of Oshtorankooh in Lorestan province is considered as one of the distinguished ecosystems of this area. For this reason, this study addresses the introduction of Floristic, and Chorology investigation and examination of Vegetation Structure of the plants in a certain part of central Zagros mountain slopes located at Oshtorankooh, Lorestan. The results of this study include identification of 62 species related to 24 families within area of just 50 hectares, located at 1600-1800 Meters altitude in Proteced area of Oshtorankooh. Asteraceae, Papilionaceae, Poaceae, Rosaceae, Lamiaceae, Liliaceae and Apiaceae and they are the most important available families of this region and comprise70%of overall species. Hemicryptophytes (32%) and Therophytes (31%) are the dominant biological forms. Chorologic investigation of the species and extraction of Chorotypes showed that Irano-Turanian 39%), Irano- Turanian–Mediterranean (22%) and Irano-Turanian–Mediterranean–Siberian European 17%) growing elements are the most important available chorological groups of this area and other plant combination is related to Caro-types which are found in two or several regions and stand in the lower orders of importance. In addition, endemically, 10 species, namely 16% of them are special and endemic within territory of Iran which comprises 0.6 % of overall endemic species of Iran.