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采用静态暗箱-气相色谱法,研究了南京市郊区集约化生产管理下,芹菜-空心菜-小白菜-苋菜轮作菜地与休闲裸地的N2O排放通量的动态变化,及其与土壤温度、湿度以及NO3--N和NH4+-N含量的关系.结果表明:轮作菜地的N2O累积排放量达137.2kg N.hm-2,显著大于休闲裸地(29.2 kg N.hm-2);轮作菜地生态系统N2O-N的排放系数高达4.6%.4种蔬菜地中,空心菜地对轮作菜地的周年累积排放量贡献最大,为53.5%,小白菜地次之,为31.9%,芹菜地和苋菜地最小,分别为4.5%和4.8%.轮作菜地的N2O排放通量与土壤温度呈显著正相关,Q10为2.80;土壤湿度以及NO3--N和NH4+-N含量与轮作菜地的N2O排放通量之间的相关性不显著.
The static dark box-gas chromatography was used to study the dynamic changes of N2O fluxes of celery-spinach-cabbage-amaranth rotation cropland and bare land under intensified production management in the suburb of Nanjing City, and the relationship between the N2O flux and soil temperature and humidity And the relationship between NO3 - N and NH4 + -N contents were studied.The results showed that N2O cumulative emission of cropland was 137.2kg N.hm-2, significantly higher than that of bare land (29.2 kg N · hm-2) Ecosystem N2O-N emission coefficient of up to 4.6% .4 kinds of vegetables in the ground, the rotation of the vegetable garden to contribute to the annual cumulative emissions of annual contribution of 53.5%, followed by cabbage, was 31.9%, celery and The minimum amount of amaranth was 4.5% and 4.8%, respectively.The N2O fluxes of rotation cropland had a significant positive correlation with soil temperature, and the Q10 was 2.80.The soil moisture, NO3 - N and NH4 + -N contents were positively correlated with N2O The correlation between emission fluxes is not significant.