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环境化学  2015 

崇明岛稻麦轮作生态系统主要温室气体排放特征及影响因素分析

Keywords: CO2,CH4,N2O,稻麦轮作,环境因子,崇明岛

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Abstract:

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NH4+-N含量呈显著正相关关系;而稻田N2O通量与NO3--N含量存在极显著正相关关系.

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