Nitrous Oxide Emissions from an Alpine Grassland as Affected by Nitrogen Addition

Nitrogen (N) addition is an important nutrient strategy for alpine grassland in northwestern China to improve productivity livestock needs. A field experiment was conducted a semi-arid investigate the effect of N rates on soil N2O emissions over growing seasons 2017 and 2018. Treatments included six (0, 10, 30, 60, 120, 240 kg ha?1 y?1), which were applied before each season. The fluxes increased with showed different episodic changes between two seasons. In 2017, maximum flux rate occurred within 2 weeks following addition. 2018, however, later season due heavy rainfall event. Growing cumulative ranged 0.32 1.11 ha?1, linearly rates. Increasing 60 yr?1 did not further increase plant above-ground biomass. inter-annual variability suggests importance moisture affecting emissions. It particularly avoid over-applying nutrients beyond needs reduce its negative environment while maintaining productivity. dissolved organic carbon (DOC) pH. These results suggest optimal this region should be yr?1.