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利用静态箱—气相色谱法测定了成都平原2004年11月至2005年5月水稻—油菜轮作系统油菜季N2O排放通量。结果表明,油菜地N2O排放通量在0.018 mg m-2h-1~0.521 mg m-2h-1之间波动,其平均通量为0.168 mg m-2h-。在油菜整个生长周期内,地下5?土壤温度与N2O排放通量之间呈指数函数关系。土壤湿度与N2O排放通量之间呈负相关。油菜地土壤N2O排放受温度、水分等因素协同作用的影响。
The N2O flux of rapeseed in rice-rapeseed rotation system was measured by static box-gas chromatography from November 2004 to May 2005 in Chengdu Plain. The results showed that the N2O flux of rapeseed fluctuated between 0.018 mg m-2h-1 and 0.521 mg m-2 h-1 with an average flux of 0.168 mg m-2h-1. During the whole growth period of rapeseed, the relationship between soil temperature and N2O fluxes was exponential. There was a negative correlation between soil moisture and N2O flux. N2O emission in rapeseed soil is affected by the synergistic effect of temperature, moisture and other factors.