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以山东省寿光市设施菜田为研究对象,利用静态箱/气相色谱法对寿光市设施菜田进行一氧化二氮(N2O)排放通量的日变化观测,研究了N2O气体日排放规律及静态箱法测定N2O排放的适宜观测时间,以期为设施菜田N2O减排提供理论依据。结果表明:追肥后N2O排放日变化规律与表层土温(2、10cm)日变化基本同步,15:00~16:00左右出现N2O排放通量最大值;追肥前N2O排放日变化具有一定的随机性,随时间的变化波动性较大,与表层土温日变化的同步性较差;追肥显著促进了N2O的排放,表层土温是追肥后N2O规律性日变化的主控因素;运用静态箱人工采样的方法进行设施菜田土壤N2O排放观测时,最适宜的采样时间追肥前应保持在8:00~10:00,追肥后应保持在9:00~11:00。
Taking the vegetable fields in Shouguang City, Shandong Province as the research object, daily diurnal variations of nitrous oxide (N2O) flux in the vegetable fields of Shouguang were studied by static box / gas chromatography. The daily emission of N2O and static Box method to determine the appropriate observation time of N2O emission, with a view to provide a theoretical basis for emission reduction of N2O in vegetable fields. The results showed that the diurnal variation of N2O emission after topdressing was basically synchronous with the diurnal variation of surface soil temperature (2,10cm), and the maximum N2O flux appeared around 15: 00-16: 00. The diurnal variation of N2O emission before dressing was somewhat random Sex, the variation with time is more volatile, and the synchronization with the diurnal variation of surface soil temperature is poorer. Top dressing significantly promoted the emission of N2O, and the top soil temperature is the main controlling factor of the regular diurnal variation of N2O after topdressing. Artificial Sampling Method When observing soil N2O emissions from a vegetable plot, the most appropriate sampling time should be maintained at 8: 00-10: 00 before dressing and 9: 00-11: 00 after top dressing.