土壤学报2013，Vol.50Issue(4)：743-751,9.DOI:10.11766/trxb201208220328
菜地氮肥用量与N2O排放的关系及硝化抑制剂效果
RELATIONSHIP BETWEEN NITROGEN APPLICATION RATE AND NITROUS OXIDE EMISSION AND EFFECT OF NITRIFICATION INHIBITOR IN VEGETABLE FARMING SYSTEM
摘要
Abstract
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.关键词
N2O排放/硝化抑制剂/蔬菜地/氮肥用量Key words
Nitrous oxide emission/ Nitrification inhibitor/ Vegetable field/ N application rate分类
资源环境引用本文复制引用
熊舞,夏永秋,周伟,颜晓元..菜地氮肥用量与N2O排放的关系及硝化抑制剂效果[J].土壤学报,2013,50(4):743-751,9.基金项目
中国科学院战略性先导科技专项—应对气候变化的碳收支认证及相关问题(XDA05020200)资助 （XDA05020200）
