In plantations of three different re-vegetation tree species (Schima superba, Acacia auriculaeformis and Eucalyptus citriodora) in southern China, the stem sap flow of individuals at different DBH classes were monitored using Granier’s thermal dissipation probes. With synchronouslymeasured meteorological data, the canopy stomatal conductance (g_c) was determined and the responses of g_c to environmental variables were analyzed. We found that daytime mean g_c in S. superba forest on average was significantly higher than those of A. auriculaeformis and E. citriodora plantations during a year (except in March). In the three plantations, g_c was positively logarithmically correlated with photosynthetically active radiation (PAR) (P<0.001), with a higher sensitivity of g_c to PAR during wet season than that of dry season. By contrast, a negative logarithmical correlation between g_c and vapor pressure deficit (VPD) was observed, with a higher sensitivity of g_c to VPD during the wet season. Additionally, a higher partial correlation coefficient between g_c and VPD was observed during wet season, indicating that VPD played a more important role in regulating the behavior of stomata during wet season. In general, the sensitivity of g_c to VPD decreased with the decreases of soil water content, but more manifest decreases were found in S. superba and E. citriodora forests than in A. auriculaeformis plantation, while the descend degree in S. superba and E. citriodora forests were equal. Overall, our results demonstrated that the native species S. superba is more suitable for revegetation in southern China than the exotic species A. auriculaeformis and E. citriodora.