Abstract: CO₂ and N₂O emissions were monitored in-situ in rape field in Chengdu plain from November 2005 to May 2006 and their controlling factors were discussed.Results show that the mean CO₂ emission flux in the rape field was 656.8 mg·m^-2·h^-1,ranging from 121.4 to 1 585.8 mg·m^-2·h^-1,the mean N₂O emission flux,168.0 μg·m^-2·h^-1,ranging from 18.0 to 521.0 μg·m^-2·h^-1.CO₂ and N₂O emission flux was highly correlated with soil temperature at 5 cm depth.Moreover,CO₂ and N₂O emission flux in the rape field was affected by soil organic carbon content,fertilization,soil temperature,plant growth and other various factors.

Key words: rape field, Chengdu plain, CO₂ flux, N₂O flux, controlling factor