Temperature is generally recognized as a key driver for variations of N2O flux from wetland soil (e.g.,Bauza et al., 2002; Allen et al., 2007), and similarly, N2O flux was found most positively correlated with temperature among all environmental factors (r= 0.617,pb0.01) in this study. However, an intriguing finding was that although the four vegetation types experience similar tidal influence and weather conditions, soil temperatures were higher in salt marshes than adjacent mangrove forests throughout the year. Accordingly, N2O fluxes were higher from the former than the latter. One possible explanation is that mangrove forests are composed of mature trees with closed canopy which efficiently cut down on the sun's radiative force reaching the soil surface and hence lead to the differences in temperature as well as N2O flux between vegetation types in this study