Soil organic carbon (SOC) is considered to be a key index in evaluation of soil quality, soil degradation and soil C sequestration. In order to discuss the temporal-spatial dynamics of SOC in reversed desertification area, Yulin County is taken as a case. Data of SOC were obtained based on the Second National Soil Survey in 1982 and re-sampling in 2003. Methods to soil sampling, SOC determination, soil organic carbon density (SOCD) and storage (SOCS) calculation are soil auger, K2Cr3O7 oxidation and FeSO4 t...