RELATIONSHIP BETWEEN NITROGEN APPLICATION RATE AND NITROUS OXIDE EMISSION AND EFFECT OF NITRIFICATION INHIBITOR IN VEGETABLE FARMING SYSTEM
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国家科技期刊平台
NETL
NSTL
维普
万方数据
通过连续种植四季蔬菜近一年的大田试验,探究高施氮水平和低氮肥利用率的蔬菜生产系统中,N2O排放量与氮肥施用量之间的定量关系及其机理,并研究硝化抑制剂减少菜地N2O排放的效果.结果表明,在氮肥施用水平为N 0～1 733 kg hm-2a-1间,无论氮肥中是否添加硝化抑制剂,N2O总排放量与氮肥施用量均呈指数函数关系,即氮肥施用量高时,N2O排放率也高.在各氮肥水平处理下,硝化抑制剂均能降低N2O排放,抑制率为8.75％ ～ 25.28％,且这种减排效果随着施氮量增加而增加.在氮肥施用量为N 300或400 kg hm-2季-1时,施用硝化抑制剂减少N2O排放所带来的效益略高于其成本,因此,即使不考虑氮肥利用率的提高等因素,施用硝化抑制剂仍是一种有利的选择.
High fertilizer N application rate and low nitrogen use efficiency are two typical problems in vegetable farming systems in China.To explore quantitatively relationship between N2O emission rate and fertilizer N application rate and its mechanism,and effect of nitrification inhibitors in mitigating N2O emission,a field experiment was carried out having four crops of vegetable and lasting one year.Results show that when the N application rate varied in the range of 0 ～ 1 733 kg hm-2 a-1,the total N22O emission increased exponentially with N application rate,no matter with or without the addition of any nitrification inhibitor,that is to say,the higher the N application rate,the higher the N2O emission rate.The application of nitrification inhibitor reduced N2O emission (8.75％ ～25.28％) from the soils of all the N fertilization treatments,and the mitigation effect increased with N application rate.In plots applied with N 300 or 400 kg hm 2 season-1,the economic benefit arising from reduction of N22O emission as a result of the use of the nitrification inhibitor was higher than the cost of the nitrification inhibitor.Therefore,the use of nitrification inhibitors is a profitable option even without considering some other factors like improving N use efficiency.
国家科技期刊平台
NSTL
维普
万方数据
