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The aim of this research was to investigate the effects of soil characteristics and elevation gradient on distribution of two Artemisia species (Ar. sieberi and Ar. aucheri). After identification of the species sites in Vard Avard, Garmsar and Semnan, data on vegetation, soil and topography were collected. Sampling was conducted in the key area of each site based on randomized-systematic pattern. The area of each plot was determined by minimal area method according to plant species and variation while number of plots was determined based on the characteristics of the sites studied. Data were analyzed using principal component analysis.
The results showed that the most important factors affecting the distribution of mentioned species were elevation and such soil characteristics as organic matter, nitrogen, texture and gypsum.