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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N2O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N2O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N2O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N2O的排放源.整个稻麦轮作周期内,CH4、N2O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N2O通量与NO-3-N含量存在极显著正相关关系.
In situ field observations of greenhouse gas CO2, CH4 and N2O emissions from the rice-wheat rotation system of Chongming Island by static box-gas chromatography (GC-MS) were carried out and the main factors influencing greenhouse gas emissions were analyzed. The results showed that rice In the rotation ecosystem, significant emission of CH4 and N2O appeared only in the growing season of rice, and there was a high degree of consistency between the seasonal changes of flux measured by the transparent and darkrooms. Rice fields were the emission sources of CH4 and N2O, And the emission sources of CO2 and N2O during the winter wheat growing season showed that CH4, N2O and black box CO2 (ie, respiratory CO2) fluxes showed significant or extremely significant differences with each temperature factor There was a significant positive correlation between CH4 flux and soil water content and soil C / N ratio. In addition, there was a significant positive correlation between CH4 flux and soil organic matter (SOM) There was a significant positive correlation between N2O flux and NH4 + -N content in paddy field. There was a significant positive correlation between N2O flux and NO3-N content in paddy field.