Abstract:Nitraria tangutorum, Zygophyllum xanthoxylum, Reaumuria soongorica, Ammopiptanthus mongolicus, Atraphaxis bracteata, Haloxylon ammodendron, Ceratoides latens, which are widely distributed in the Alashan arid desert area were selected for study. The nitrogen status of various forms, soil organic carbon content and changes of soil pH both in the rhizosphere and bulk soil. Total nitrogen,ammonium and nitrate in rhizosphere were 24.9%, 24.5% and 65.1% higher than that the bulk soil. Soil organic carbon in the rhizosphere was 18.5 % higher and soil pH was lower by 0.14 units than the average. There were significant differences in content of soil total nitrogen, nitrate and organic carbon content between rhizosphere and bulk soil. Except of Ammopiptanthus mongolicus, the soil ammonium content in other shrubs′ rhizosphere was higher than bulk soil. Among the seven shrubs, only the soil pH in Haloxylon ammodendron′s rhizosphere was higher than that of the bulk soil, the soil pH under the other six shrubs. The differences soil organic carbon and soil total nitrogen between the rhizosphere and bulk soil showed a significant linear relationship. There was no correlation in soil total nitrogen and ammonium between the rhizosphere and the bulk. Soil total nitrogen and nitrate in the rhizosphere and bulk soil were significantly correlated.