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亚热带蔬菜地是氧化亚氮(N_2O)的重要排放源,本研究首次采用基于闭路量子级联激光吸收光谱仪的涡动相关(QCLAS-EC)法观测亚热带蔬菜地秋冬季非施肥阶段的N_2O排放通量,以评估QCLAS-EC法测量亚热带蔬菜地N_2O通量的适用性。结果表明,QCLAS-EC观测系统在野外条件下能长期稳定运行,可观测到N_2O排放的季节变化趋势,其检测限为18.5μg N m~(-2) h~(-1)(95%置信水平),试验期间获得的97.5%的N_2O通量大于此检测限,表明QCLAS-EC观测系统可有效并准确测量亚热带蔬菜地的N_2O排放通量,仪器本身的灵敏度不是通量检测的限制因素。
Subtropical vegetable land is an important source of N2O emissions. In this study, the QCLAS-EC method based on the closed-loop quantum cascade laser absorption spectrometer was used for the first time to observe the N2O emission in the non-fertilization stage of subtropical vegetable fields in autumn and winter. To assess the applicability of the QCLAS-EC method for measuring N_2O fluxes in subtropical vegetables. The results show that the QCLAS-EC observing system can be operated stably for a long time in the field and the seasonal variation of N 2 O emission can be observed with the detection limit of 18.5 μg N m -2 h -1 (95% confidence interval 97.5% of the N 2 O flux obtained during the test is greater than the detection limit, indicating that the QCLAS-EC observing system can effectively and accurately measure the N 2 O flux in subtropical vegetable fields. The sensitivity of the instrument itself is not a limiting factor of flux detection.