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.