This research was conducted in Semnan province, Iran. In order to study, 2 sites were selected. To estimate C storage and their distribution in the different treatment, biomass (above ground and belowground), soil (0-100 cm) and litter were sampled and analyzed. Soil was sampled by collecting 5 cores in every treatment and its control area from depth of 100cm in a completely randomized design. Soil samples were air-dried, Gravel and roots were separated and samples were passed through the 2-mm sieve. Gravel was weighed and roots were taken to weigh after drying. To determine soil organic C the Walkley–Black method was used. Soil bulk density was determined for converting soil C concentrations (gr/kg) to C aggregate (ton/ha) in the soil.Result show that both land use change to Haloxylon ammodendron and pistachia Vera plantations have increased 89% and 185% in carbon of biomass respectively. In the soil, although H. ammodendron plantations have increased SOC but Pistachio has decreased SOC storages of soil. Generally haloxylon plantation has considerably increased sequestrated carbon of ecosystem. The similar results were not recorded for land use change into pistachio plantations
