Daily change of nitrous oxide emission from vegetable system

Undisturbed soil monolith lysimeters were conducted to study daily nitrous oxide(N2O) emission and its relationship with soil temperature and water content in a continuous vegetable cropping system in Wuhan.Results showed that N2O daily emission increased with the increase of soil temperature and the peak emission occurred at the highest temperature when soil moisture was relatively stable.However,when soil moisture changed rapidly in one day,the peak emission of N2O occurred at appropriate soil moisture and relatively high soil temperature,meaning that both soil moisture and temperature affected the daily change of N2O emission in this vegetable system.Nitrogen fertilizer was found to be another important factor in affecting daily N2O emission.