Effects of excrement application on greenhouse gas emissions in a typical steppe

An excrement application experiment was conducted to investigate the effects of excrement application time and temperature on greenhouse gas (GHG) emission in a typical by measuring CH₄, CO₂ and N₂O at 7, 14 and 21 days and different temperature using the chamber-gas chromatography method.This study indicated following results: 1) The excrement application decreased the GHG flux in a typical steppe, which also decreased with the application time. Additionally, the excrement application decreased the absorption for CH₄, which was lower than that of control. Emission for CO₂ and N₂O increased, and then decreased to lower than the control by 21 days later. 2) In addition to the positive correlation between CO₂ emission and soil temperature of control, a negative correlation was found for the soil temperature with the CH₄ absorption and N₂O/CO₂ emission in the excrement application and control groups.