Effects of land utilization types on soil organic carbon mineralization in agropastoral transitional zone

In order to study the impact of land utilization types on accumulation and mineralization of soil organic carbon mineralization in agropastoral transitional zone，the mineralization content of soil organic carbon and mineralization rate of three land utilization types soil (Alfalfa pasture, Naked oatsalfalfa rotation, Crop farmland) in agropastoral transitional zone have been investigated. The results showed that alfalfa field contained the highest organic carbon and naked oatsalfalfa rotation was the lowest. In the same humidity and temperature condition, the amount of soil organic carbon mineralization of three land utilization types were all decreased with the increment of time. Soil organic carbon mineralization showed a significant positive correlation with month mineralization content (P0.01). Soil organic carbon mineralization increased with soil nitrogen and the correlation was not significant.