Dynamic of denitrification rate and N₂O flux in maize field

Denitrification rates and N₂O fluxes are measured by using the acetylene inhibition method on intact soil cores in different N－fertilized maize plots.The relationships among denitrification rate and N₂O flux with soil moisture,soil temperature and NO^-₃-N concentration in soil are analyzed,and losses of N－fertilizer caused by denitrification and N₂O emission are calculated.The results show that denitrification loss from soil is 0.67～3.85kg/hm² during the growing period of maize,percentage of denitrification loss from N－fertilizer is 0.5%～1.5%,the total N₂O emission is 0.55～1.42kg/hm²,and N₂O emission coefficient of N－fertilizer is 0.2%～0.5%.