An investigation on floristic composition and species richness of Asadli-Pelmiss summer rangeland in north Khorasan province

In this study, floristic composition and species richness of Pelmiss summer rangeland located between Bojnord and Esfarain were studied through flora collection and using Whittaker plots in exclosure and degraded rangelands. The main goals of this study were to determine floristic composition and species richness in different vegetation types and also effects of slope and aspect on species richness. The data were analyzed by using linear and group regression model. According to the results, two relationships i.e. (HE > CH > TH > GE >PH) and (Forbs > Woody plant > Grasses) were found in view of biological types and growth form respectively. Species richness in exclosure area was more than that in degraded area. Species richness in western and northern slopes was also higher than that in eastern and southern slopes. In general, it can be concluded that vegetation of the study area is mostly of perennial plant species, a characteristic of mountainous areas with cold climate in altitudes.