The effect of permanent and seasonal grazing management on diversity of vegetation in rangelands during growing season(case study: Shavaz rangelands of Yazd Province)

Rangeland ecosystems stability comes from a proper management of resources which would be themselves possible just by being familiar with different management and utilization methods. As far as grazing duration is one of important factors in rangeland management, effect of grazing duration along growing season in simmer and rural rangelands of a steppe area in Yazd province , named Shavaz, has been studied in this investigation.Therefore a systematic random sampling due to the dominant life form and homogenity of vegetation with taking 30 plots of 2 quadrat metre area along 10 transects in both sites of rural and summer rangelands in three time intervals of beginning , in the middle and at the end of growing season has been done and measured.In each plot , list of species, canopy cover and number and production of plants were measured and there were analyzed data by two-way variance and Duncan test in the SPSS software. Results indicate significant decrease (p