【摘要】 为明确减量灌溉和施肥对设施菜地N₂O排放的影响,提出有效的N₂O减排措施,本研究采用静态箱法,对北京郊区设施芹菜在灌溉和有机肥（沼渣）减量处理下的N₂O排放进行全生长季监测,分析灌溉和有机肥减量对土壤充水孔隙度（WFPS）、NO₃^--N和NH₄⁺-N含量及土壤N₂O排放的影响。试验为2个灌溉量和3个有机肥施用量的裂区双因素设计,具体为:常规灌溉量（H处理）下的常规施肥（HN）、减量1/3施肥（HN3）和不施肥（HN0）,以及减量20%灌溉（L处理）下的常规施肥（LN）、减量1/3施肥（LN3）和不施肥（LN0）共6个处理。结果表明,L处理在保证芹菜产量的前提下,对土壤充水孔隙度及无机氮含量无显著影响,但N₂O排放总量较H处理减少32.23%,达极显著水平（P<0.01）。与常规施肥处理相比,减量1/3施肥和不施肥处理的土壤NO₃--N含量分别降低43.96%和76.42%,均达极显著水平（P<0.01）,不同施肥量处理间土壤NH₄⁺-N含量无显著差异;芹菜产量随施氮量增加而增加,但减量1/3施肥和常规施肥处理对芹菜产量影响无显著差异,芹菜全生长季的土壤累积N₂O排放总量显著减少62.04%（P<0.01）。本试验条件下,减量20%灌溉（L处理）和减量1/3施肥（N3处理）均能保证芹菜产量,显著降低芹菜地N₂O排放通量,减少生产成本投入。更多还原

【Abstract】 In order to monitor the N₂O emissions after irrigation and organic fertilization from vegetable soil in celery growing season,and make sure effective reduction measures were put forward,an experiment with 6 treatments was done in Beijing suburbs by using static chamber measurement techniques.The impact of the reductions of irrigation and organic fertilization（biogas residue） on the water-filled pore space（WFPS,0-5cm）,NO₃^--N content,NH₄⁺-N content and N₂O emissions were analyzed.It was a split block experiment with irrigation and fertilization two factors.The 6 treatments were as fellows:conventional irrigation under the condition of conventional fertilization（HN）,conventional fertilization with 1/3 decrement（HN3） and no fertilization（HN0）,and conventional irrigation with 20% decrement under the condition of conventional fertilization（LN）,conventional fertilization with 1/3 decrement（LN3） and no fertilization（LN0）.The results showed that,conventional irrigation with 20% decrement reduced total N₂O emissions by 32.23%,significantly lower than that of conventional irrigation（P<0.01）,however,had no significantly influence on celery yield,WFPS and Nmin content of soil.Compared with conventional fertilization,the treatments of conventional fertilization with 1/3 decrement and no fertilization had no significantly influence on NH₄⁺-N content of soil,however,significantly reduced NO₃^--N content of soil（P<0.01） by 43.96% and 76.42%,respectively.In addition,conventional fertilization with 1/3 decrement made the cumulative N₂O emissions from the soil in the whole growing season of celery,significantly reduced by 62.04%,however,had no significantly influence on celery yield.In this field experiment,conventional irrigation with 20% decrement（L） and conventional fertilization with 1/3 decrement（N3） both significantly reduced N₂O emissions,and had no significantly influence on the celery yield,furthermore,the combination of the decrement of irrigation and fertilization（LN3） can reduce the production costs at the same time.更多还原