Impacts of water condition on CO2 emissions in Bayinbuluke Marsh Meadow

The CO2 emission in Carex tristachya alpine wetland with different water conditions in Bayinbuluke Swan Lake, Xinjiang Tianshan Central in summer were measured with portable soil respiration measurement system (CIRAS-2-SRC) made by British PP system company. The results showed that the biomass of humid area was greater than that of the drying area. The CO2 emission of drying area was higher than that of the wet area. The diurnal variation curve of CO2 emission from dry area was unimodal curves with the highest points occurred between 14:00 and 16:00 (1.185 0 g CO2m-2h-1). The diurnal variation curve of CO2 emission from wet area were bimodal curves with the highest points occurred at 12:00 and 16:00, respectively, and the highest value was 1.024 0 g CO2m-2h-1. The litter content of biomass had effects on soil CO2 emissions under different water conditions, however, soil temperature was the major limiting factor for CO2 emissions. CO2 emissions had a significant positive correlation with surface soil temperature in the dry area （P0.01）and did not have significant positive correlation with soil humidity（Pwet area=0.997,Pdry area=0.409）.