Continuous N supply at a low temperature produces less N2O emission in a semi-arid grassland soil

Greenhouse gas nitrous oxide (N2O) emissions in soils are mainly driven by nitrification and denitrification, which are sensitive to environmental change. However, the response of soil N2O emission to N addition rates and elevated temperature in semi-arid grassland remains poorly understood, where nitrification dominates N2O emissions. We examined N2O emissions of a clay-loam loess to three N supply levels: no N supply (Control), 10 μg NH4+-N g1 soil per 3 days (continuous N supply, CN) and 100