Abstract:Long-term experiment in Fluvo-aquic soil at Fengqiu Agro-Ecological Experiment Station of CAS in Henan was utilized to study effect of different fertilization treatments on soil organic carbon (SOC), and simple Jenny model was used to simulate dynamics of organic carbon. Results showed that application of inorganic and organic fertilizers significantly increased SOC contents of Fluvo-aquic soil, while effect of organic fertilizer was more obvious than inorganic fertilizer; Fertilization not only affected equilibrium levels of organic carbon but also changed decomposition rates of organic carbon significantly; Eequilibrium values of organic carbon were 7.19, 7.75 and 9.37 g/kg for NPK, 1/2OM and OM treatments, respectively whereas the decomposition rates of organic carbon were 0.038, 0.113 and 0.145 1/a for corresponding three fertilizer treatments, respectively. Compared with storage of C in 1989, when soil organic carbon reached the equilibrium state, storage of C in CK treatment would lose 1478 kg/hm2, but would increase 7376, 7790 and 12066 kg/hm2 in NPK, 1/2OM and OM treatments, respectively; Fertilization practices would intensify Fluvo-aquic soil function as C sink.