Abstract:The increasing temperature under global warming has great effects on the carbon cycle of terrestrial ecosystem,and the alpine marsh meadow ecosystem is the sensitive area to climate change.In this paper,two alpine swamp meadows(Xiaopohu Lakeside Wetland and Wayanshan Headwater Wetland)in the Qinghai Lake Basin were taken as the research objects,and Open Top Chamber(OTC)and static box-like gas chromatograph were used to analyze the diurnal variation of three main greenhouse gases(CH4,CO2 and N2O)in September 2018.Results showed that Xiaopohu Lakeside Wetland was the source of CH4 and CO2 while the sink of N2O.The absorption capacity of CH4 and CO2 increased in response to warming,which reduced the CH4 and CO2 fluxes by 48.43% and 20.65%,respectively,while there was no significant effect on N2O flux.Wayanshan Wetland was the sink of CH4 and the source of CO2 and N2O,respectively.Warming at Wayanshan Wetland shifted CH4 from weak sink to weak source,and shifted N2O from weak source to weak sink,and promoted the CO2 emission capacity with an increase in CO2 emission flux by 15.79%.There was a significant correlation between soil CO2 flux and soil temperature at the soil depth of 10 cm,20 cm at Xiaopohu Wetland(P<0.05),but no other significant correlations were found,which was mainly due to the hysteresis effects of surface soil temperature and water content.In general,global warming has some effects on the greenhouse gas emission flux from Alpine meadow in Qinghai Lake,and the response of different types of Alpine meadow to global warming was also different.The information is important for understanding the future carbon balance of the Qinghai Lake Basin and Tibetan plateau.