采用静态箱———气相色谱法对崇明岛稻麦轮作生态系统主要温室气体CO2、CH4和N2 O排放进行了田间原位观测，并分析了影响温室气体排放的主要因素。结果表明，崇明岛稻麦轮作生态系统中，CH4和N2 O的显著排放仅出现在水稻生长季，且透明箱与暗箱测得通量季节变化趋势具有高度一致性；水稻田是CH4和N2 O的排放源，是CO2的吸收汇；冬小麦生长季农田表现为CH4的吸收汇，是CO2和N2 O的排放源。整个稻麦轮作周期内，CH4、N2 O以及暗箱CO2（即呼吸排放CO2）通量与各温度因子呈现出显著或极显著正相关性；CH4通量与土壤含水率、土壤C／N比值均存在极显著正相关性。另外，稻田CH4通量与土壤有机质（ SOM）含量之间存在极显著正相关性，与土壤NH＋4?N含量呈显著正相关关系；而稻田N2 O通量与NO－3?N含量存在极显著正相关关系。
This paper used static chamber technique to investigate the emission and consumption of CO2 , CH4 and N2 O in rice?wheat rotation system, in Chongming Island. Based on one year data, the following conclusions were drawn: On the whole, rice field was the emission source of CH4 and N2 O, and the sink of CO2 . Wheat field was the sink of CH4 , and the emission source of CO2 . In rice?wheat rotation field period, the correlation between CH4 , N2 O, CO2 respiration emission flux ( opaque chamber ) and the temperature was significant or extremely significant; Extremely significant positive correlation between annual CH4 flux variation, soil moisture content, and C/N value was found. In rice field period, there was the significant positive correlation between CH4 flux and SOM( Soil organic matter) content, NH+4?N content;the significant positive correlation between N2 O flux and NO-3?N content also was found.
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