Soil samples from four land use types including forest,shrub,cultivated land and orchard were collected to investigate the soil organic carbon(SOC)storage,decomposition rates and the accumulation rate of degraded SOC in the karst area of Maocun village,Guilin City.The results show that the contents of SOC varied under different land use.The SOC contents of different land use in descending orders are forest, shrub,cultivated land,and orchard for 0—20cm soil layer,forest,cultivated land,shrub,and orchard for 20—40cm soil layer,and cultivated land,shrub,and orchard for 40—60cm soil layer,respectively.The results of the comparative incubation experiment show that the SOC decomposition and accumulation rates in descending order were forest,shrub,cultivated land,and orchard.