中文摘要：

为揭示奶牛场沼液灌溉后麦地CO2和N2O排放通量的变化特征及与相关环境因子相互关系,采用静态箱-气相色谱法对奶牛场沼液灌溉后第1d土壤CO2和N2O排放通量连续进行24h观测,同时观测灌前1d、灌后第2d、第4d和第7d排放通量。结果表明,沼液灌溉（SI）、习惯施肥（CF）、不施肥（CK）处理灌后第1d土壤CO2与N2O日排放通量范围分别为115.55~253.44、66.97~114.17、62.86~125.96mg/（m2·h）与115.79~401.1、4.15~21.04、1.44~28.32μg/（m2·h）,日峰值和日谷值均出现在14：00和5：00;除CK外,各处理排放通量与地表及距地表5cm处地温显著相关（P〈0.05）。灌溉前后CK和CF处理CO2和N2O排放通量变化较小。灌溉后SI处理土壤CO2和N2O排放通量迅速升高且分别在灌后第1d和第2d达到排放峰值,此时CO2和N2O排放通量分别较SI处理灌溉前分别升高111.9%和890.0%,随后SI处理CO2和N2O排放通量开始下降,灌溉后第7d分别与CK和CF处理相比无显著差异。灌溉后7d内SI处理的CO2和N2O累积排放量均显著高于CK和CF处理。

英文摘要：

Three treatments including biogas slurry irrigation（SI）,conventional fertilization control（CF）and no fertilizer control（CK）were used to investigate the emission characteristics of CO2 and N2O,and to explore the correlation between gas emission and related environmental factors.CO2 and N2O emissions from soil were observed for 24 himmediately after the slurry irrigation by Static-Gas Chamber method.Meanwhile,CO2 and N2O fluxes on the 2nd,4th and 7th day after irrigation were also monitored.The results showed that CO2 and N2O emissions of three treatments were equal in 24 hours before irrigation.The gas emission peaked at 14：00and dropped to the lowest value at 05：00in the first day after irrigation.Hourly gas emissions of SI,CK and CF treatments were 62.86~125.96 mg/（m2·h）,16.97~114.17mg/（m2·h）,115.55~253.44mg/（m2·h）for CO2,and 1.44~28.32μg/（m2·h）,4.15~21.04μg/（m2·h）,115.79~401.12μg/（m2·h）for N2 O,respectively,in the first day after irrigation.The result also proved that there was significant positive correlation（P0.05）among gas emissions,temperature of5 cm soil layer and temperature of soil surface in the first 24 hours after irrigation.Compared with the daily gas emissions of CK before irrigation,CO2 and NO2emissions from SI treatment in the first day after irrigation were increased by 111.9% and 890.0%,respectively.The peaks of daily CO2 and N2O emissions appeared on the 1st and 2nd day after irrigation.After reaching the maximum emission,daily CO2 and N2O fluxes declined rapidly.There was no significant difference among three treatments in the 7th day after irrigation.The CO2 and N2O accumulate emissions of SI were significantly higher than that of CK and CF treatment within seven days after irrigating.