Effect of Enclosure on Biodiversity and Similarity of Rangeland Plant Species

The biodiversity, similarity, and distribution of plant species under two levels of grazed and enclosure in rangeland areas, were observed using different indicators, enclosure areas, 2 and 5 years and reference area (under grazing). The data was collected the species, the number of individuals per species and the present and absent of plant species. The indices were calculated for the distribution, species biodiversity and similarity of each region. There was no significant effect on biodiversity. The Margalef and Menhinick richness indices showed significant effect of enclosure on the richness species. The species richness was highest in enclosure 5 years and the lowest enclosure area for 2 years. Among the quality indicators for the ecological similarity of expression the only significant difference was in simple matching similarity coefficient.