N_2O EmissionFlux in the Rice-Rape Rotation System in the Chengdu Plain

N2O emission was measured in rape growing season of a rice-rape rotation system in the Chengdu plain from November 2004 to May 2005.The factors influencing N2O emission were discussed.The results showed that the mean N2O emission flux in the rape fields was 0.168 mg m-2 h-1,ranging from 0.018 to 0.521 mg m-2 h-1.The N2O emission flux was highly correlated with soil temperatures at 5 cm depth and negatively correlated with soil moisture.N2O emission flux in the rape fields was affected by soil temperature,moisture and other factors.