This research focused on evaluation of influence of grazing with different intensity on carbon and nitrogen storages in biomass on the arid shrublands of Iran that covered by Ar.sieberi species. Differences in grazing intensity were quantified as non-grazing (NG), moderate (MG) and heavy (HG) based on rate of vegetation utilization. To estimate C and N stored in biomass and their relationship in plant compartments, simple biomass equations were extended in each treatment. To assess carbon and nitrogen storage and their distribution in the different treatment, biomass (aboveground and belowground), was sampled. Results show that C and N in aboveground and belowground were decreased significantly by grazing intensities in both heavy and moderate grazing in comparison with non-grazing treatment. ]It was seen that grazing not only had a potential to change the amount of aboveground and belowground biomass in ecosystem, but also could change the allocation of these elements and relative allocations of belowground that were increased by grazing intensity. Although heavy grazing reduced the amount of belowground biomass, moderate grazing didn’t respond to belowground biomass in this area.
