Abstract:The distribution of organic carbon and labile organic carbon along soil profile in swamp soil and peat soil in Ruoergai alpine wetland were studied.The results showed that the contents of SOC and TN in swamp soil had a descending trend along soil profile but increased at 16~18 cm which was related with the source of SOM and the sediment environment at that time.The contents of SOC in peat soil did not show the same descending trend along soil profile but showed an ascending trend from surface layer to 22 cm and descending trend from 22 cm to 30 cm.The distribution characteristics of TN in peat soil were different from that of SOC.The contents of TN in peat soil were high at 0~10 cm and decreased downwards.The contents of LC in swamp soil had a descending trend along soil profile and changed from 13.6 mg/g to 2.4 mg/g;hence the vertical distribution variance index was 53.25%.The contents of LC in peat soil did not show obvious change trend and changed from 30 mg/g to 45 mg/g;hence the vertical distribution variance index was 11.62%.LC was 3%~17% of SOM in swamp soil and 7%~12% in peat soil.The maximum of L in swamp soil and peat soil was not at surface layer but below surface(8~10 cm).