SHE analysis in defining species diversity of vegetation components in exclosure and grazing areas (Case Study: Mahoor, Mamasani Rangelands, Fars province)

Diversity indices mainly composed of two components: Species Richness and Evenness. Critical to the analysis of diversity is a clear of the relationships among S (species richness), H' (information), and E (evenness) (i. e. SHE). One historically intractable problem in biodiversity analysis has been: How to Separate species richness and evenness into distinct components within the same system? This is important because H may actually not vary at all, even in the face of increasing species richness. In other cases, H can increase while E remains constant. Due to the importance of these components, a simple solution, SHE analysis, has only recently been derived. In this study SHE analysis was used to define the role of each diversity components in exclosure and grazed of Mahoor, Mamasani Rangelands. Therefore, 50 random- systematic plot of 1 m2 were laid out to determine vegetation cover percentage. SHE analysis was employed to separate species diversity into its richness and evenness component in exclosure and grazing. Results show that the role of species richness is much more than evenness in defining diversity index in both under studied regions.