为探究西辽河平原浅埋滴灌条件下优化施氮对春玉米田土壤温室气体排放的影响，2019年在内蒙古通辽市科尔沁区农业高新科技示范园区，以传统漫灌常规常量追氮为对照（CK），采用静态暗箱-气相色谱法测定浅埋滴灌下常量追氮（T1）和优化追氮（T2：70%常量追氮）2个处理春玉米田生育期内CO2、N2O和CH4排放特征。结果表明，浅埋滴灌下T1和T2处理玉米产量无显著差异，均显著高于CK（P<0.05）。玉米生育期内，在相同施氮量下，浅埋滴灌相比传统漫灌N2O排放量增加了11.78%，CH4吸收量降低了34.78%，但CO2排放量无显著差异；浅埋滴灌下优化追氮T2处理较常规追氮T1处理CO2和N2O排放量分别减少了13.15%和20.27%，而CH4吸收量无显著差异。相同施氮量下，与传统漫灌相比，浅埋滴灌降低了温室气体排放强度（P<0.05），浅埋滴灌下优化追氮T2处理较常规追氮T1处理温室气体排放强度降低了10.46%；综合增温潜势浅埋滴灌和传统漫灌无显著差异，但均显著高于浅埋滴灌优化追氮T2（P<0.05）；净生态系统经济预算浅埋滴灌下T1和T2处理无显著差异，均显著高于CK（P<0.05）。综合来看，在相同施氮量下，浅埋滴灌相比传统漫灌，增加了N2O排放，降低了CH4吸收；浅埋滴灌下优化追氮T2处理，既降低了温室气体排放强度和综合增温潜势，又保证了较高玉米产量和净生态系统经济预算，是西辽河平原玉米兼顾高产、高效和生态的水氮管理模式。

In order to explore effects of optimized nitrogen application on the greenhouse gas emissions in spring maize fields under the shallow drip irrigation in the Xiliaohe Plain, characteristics of CO2, N2O and CH4 emission during the growth period of the constant nitrogen topdressing (T1) and optimized nitrogen topdressing (T2: 70% constant nitrogen topdressing) under shallow drip irrigation were determined using method of static dark box-gas chromatography and adopting conventional irrigation with conventional constant nitrogen topdressing as a control (CK) in the Agricultural High-tech Demonstration Park of Horqin District, Tongliao City, Inner Mongolia in 2019. The results showed that there was no significant difference in maize yield between T1 and T2 treatments under shallow drip irrigation, both of which were significantly higher than CK (P<0.05). Compared with the traditional irrigation under the same nitrogen application, the N2O emission of shallow drip irrigation increased by 11.78% and the CH4 uptake was reduced by 34.78%, but there was no significant difference in CO2 emissions during the growth period of maize; compared with T1, the CO2 and N2O emissions of T2 reduced by 13.15% and 20.27% respectively, but there was no significant difference in CH4 absorption under the shallow drip irrigation. Under the same nitrogen application, the shallow drip irrigation reduces the intensity of greenhouse gas emission (P<0.05) compared with traditional irrigation, and the intensity of greenhouse gas emission of T2 decreases by 10.46% compared with that of T1; there was no significant difference in comprehensive warming potential between shallow buried drip irrigation and traditional irrigation, both of which were significantly higher than that of T2 under the shallow drip irrigation (P<0.05); there was also no significant difference in net ecosystem economic budget between T1 and T2 under shallow drip irrigation, both of which were significantly higher than that of CK (P<0.05). In general, compared with traditional irrigation, the shallow drip irrigation increases N2O emissions and reduces CH4 absorption under the same nitrogen application; the treatment of T2 reduces greenhouse gas emission intensity and comprehensive warming potential, and ensure higher maize yield and net ecosystem economic budget, which is a water and nitrogen management model for maize in the Xiliaohe Plain that combines high yield, high efficiency and ecology.

国家重点研发计划项目（2017YFD0300805）；内蒙古自治区自然科学基金项目（2018MS03059）