Abstract: With pot experiment and using static chamber-GC technique,this paper studied the effects of N application(150 and 300 mg·kg^-1 soil)and maize growth on N₂O emission from soil.In maize-planted soil,the N₂O emission rate increased with increasing N application rate,its peak appeared at seedling stage,and there was no significant correlation between N₂O emission and air temperature.Contrarily,in bare soil,the peak of N₂O emission rate occurred at the anaphase of the experiment,and there was a significant exponential correlation between N₂O emission and air temperature.The total amount of N₂O emission increased remarkably with increasing N application rate in both planted and bare soils.In comparing with bare soil,maize-planting reduced N₂O emission by 92% and 87%,respectively at high and low N application rates,which suggested that maize-planting not only affected the seasonal variation and magnitude of N₂O emission from soil,but also altered the relationship between air temperature and soil N₂O emission.

Key words: Alexandrium tamarense, Red tide, Nitrogen, Phosphorus, Specific growth rate