Abstract: The characteristics of the nitrous oxide flux in the winter wheat field under different field managements,such as tillage(CK),straw cover,non-tillage,straw deep fertilization and organic manure application was monitored by the static automated chamber and field continuous measurement system.The results showed that the high N2O flux occurred from 12:00 to 17:00,while the low N2O flux was from 0:00 to 3:00.N2O flux during spike formation stage of winter wheat was significantly correlated with the air temperature and the soil temperature at 5 cm depth.The synchronous irrigation and fertilization during jointing stage of winter wheat would lead to a 15-20 days N2O flux peak.The amount of N2O emission under different field managements during growing period of winter wheat from high to low was arranged in turn organic manure application,non-tillage,straw cover,straw deep fertilization and tillage,and their differences were extremely significant.However,the differences of N2O emission amount among the treatments of straw cover,straw deep application and tillage were not significant.

Key words: Static automated chamber, Static automated chamber, Continuous measurement, Winter wheat field, N2O flux