Effect of warming and precipitation on soil CO2 efflux and its stable carbon isotope composition in the temperate desert steppe

An experiment was conducted to investigate soil CO2 flux and its isotope composition with three levels of warming (T0: ambient temperature; T1: increase the air temperature by 1 to 2℃; T2: increase the air temperature by 2 to 4℃), three levels of increased precipitation (W0: ambient precipitation; W1: W0+25%; W2: W0+50%) treatments and their interaction (T*W) in Inner Mongolia, China.