Taking 7- and 11-year-old mixed Schima superba - Cyclobalanpsis glauca plantations(SC)(plantations were transformed from degraded shrub forest) and the reserved shrub forest(SF) in north subtropical areas of China as test objects,we analyzed the effects of stand age on the soil labile organic carbon content.(1)As compared with SF,the soil total organic carbon content(TOC),easily-oxidized carbon content(EOC) and light fraction organic matter content(LFOM) in both 7- and 11-year-old SC stands were increased by 22.79%-43.34% and 52.33%-96.13%,11.11%-25.18% and 57.89%-100.90%,18.18%-85.20% and 74.50%-93.75%,respectively.The water-soluble organic carbon content(WSOC) in 7-year-old SC were decreased by 4.10%-9.53%(except in 10-20 cm soil layer) and in 11-year-old SC increased by 0.71%-5.37% compared with SF.(2)The ratios of WSOC/TOC in the soils followed the order of SF>7-year-old SC>11-year-old SC,whereas the EOC/TOC in the soils followed the order of 11-year-old SC>SF>7-year-old SC.(3)In the three stands,soil WSOC,EOC,and LFOC had extremely significant correlations with soil TOC(P<0.01),and the correlation coefficients between WSOC and TOC were lower than others.The soil TOC,EOC,and LFOC in the three stands were extremely significantly correlated with soil nutrients,but the soil WSOC in SF had no significant correlations with soil hydrolysable N and available K.The soil organic carbon of evergreen broad-leaved young plantations transformed from shrub forest has changed significantly,and the long-term effect of stand age on the soil organic carbon accumulation need to be further studied.