To examine the effects of soil warming on carbon dynamics in the wetland ecosystem,a field-warming experiment was conducted under flooded and regular conditions in a typical meadow﹝Calamagrostis angustifolia(TMC) wetland﹞of the Sanjiang Plain,Northeastern China.Electrical cables were used to simulate soil warming.Warming caused significant increases in aboveground biomass on most measuring dates,accounting for 85.12% and 49.37% more than the control under the two water conditions,respectively.Meanwhile,the root biomass also increased by 43.27% and 54.39%,respectively.Elevated temperature tended to improve soil nitrogen availability through the growing season,which was significantly correlated to the increase of aboveground biomass and root biomass.Compared to control,CO₂ andCH₄ fluxes of the average growing season increased by 30.55% and 31.39% respectively,and were positively correlated with 5 cm soil temperature.However,flood condition significantly reduced the aboveground biomass while increased the root biomass.However,it had no significant effect on soil NH₄-N contents and CO₂ and CH₄ fluxes.The results indicated that soil warming would have direct effects on the fluxes of CO₂ and CH₄ and indirect effects on the biomass accumulation of C.angustifolia through improving soil NH₄-N availability in TMC wetland ecosystem.However,little interaction between carbon sequestration and emission processes was found under soil warming conditions.