Rangelands which could save more than one third of the earth biosphere carbon, are one of the most important source of carbon sequestration. These lands have the greatest potential for carbon sequestration. Carbon sequestration of dominant rangelands plants namely Artemisia sieberi, onobrychys cornuta, Stachis inflate, Stipa hohenakeriana are the scoop of this study. Soils of the study area, Tilabad rangelands in Golestan province, were taken from the established plots to determine organic carbon content and bulk density. Species with the highest carbon sequestration were identified using the Tukey multiple comparison method in R software. Results of 32 plots samples showed that the highest amount of biomass carbon is sequestration has happened in Artimisia siberi (1.35 kg/ha) and the lowest by Stipa honenackerian (1.15 kg/ha). The amount of soil carbon rate for Onobrychys cornuta species was 31.67 ton per hectare that indicates its outstanding role in soil carbon sequestration. Recognition of capacity of native species for each region helps to understand the importance of natural ecosystem. Safety of natural resources is a major  rehabilitation operation to U-turn of degraded and eroded lands from perspective of carbon sequestration.

Keywords: Organic Carbon, Tukey test, Range lands, Tilabad, Golestan

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