Soil productivity is strongly linked to soil organic matter (SOM) because SOM plays important roles in improving soil structure, soil water holding, infiltrating and capacities, and the nutrients supply to crops. It is significant that effect of land-use and management on soil organic matter turnover and land productivity is investigated for the sustainable agriculture and environment protection in gully area of the Loess Plateau. On the basis of long-term experiment, changes in soil organic C, N and dynami...