Choice of wetland use pattern to minimize the impacts on soil carbon fixation and CO₂ gas emission is the key for reasonable utilization of wetland and reduction of greenhouse gas emission. Wetland soil respiration is affected not only by environmental conditions, but also by soil traits. By a positioned experiment in Wanjing region, CO₂ emission flux, air temperature, surface soil temperature of soils in natural wetland and different reclaimed lands during the non-cropping season were measured and their soil TOC contents were analyzed. The land use types, in order of decreasing CO₂ emission flux, were paddy field[700.70 mg/(m²·h)], dry land[433.80 mg/(m²·h)] and natural wetland[302.66 mg/(m²·h)]. The soil TOC content of natural wetland was significantly higher than that of reclaimed dry land and paddy field (0-30 cm depth), indicating that the contribution of natural wetland to atmospheric CO₂ concentration was the lowest. Therefore, compared to dry land and paddy land, wetland is capable of storing more carbon. The correlation between CO₂ emission flux and temperature was also discussed. It follows from the discussion that CO₂ emission flux of the three land types is positively correlated with both of atmospheric temperature and surface soil temperature.