Comparison of plant species diversity in two grazed and enclosed rangeland sites in ountainous rangelands of central Zagros (Case study: Dishmook in Kohgiluyeh & Buyer Ahmad province)

The study of plant diversity dynamic on grazed and enclosed rangelands is important inrange management. The effect of enclosure was studied on plants diversity dynamics on two ange condition sites of Dishmook area in Kohgiluyeh & Buyer Ahmad province. Randomsystematic ampling was done in two range sites using 220 (2×2 m2) quadrates along 6 transects ith the length of 100 m. Vegetation canopy cover percentage was recorded simultaneously in oth range sites. Diversity, richness and evenness were determined by using plant diversity ndices (Shannon, Simpson, Berger parker & Mc intash). Results show a higher species ichness, evenness and species diversity indices in enclosed rangeland. Statistical T-Student Test showed significant differences between two sites in 5 percent level of probability