Yield-scaled nitrous oxide emissions from nitrogen-fertilized croplands in China:A meta-analysis of contrasting mitigation scenarios

• 作者: Garba ALIYU Jiafa LUO Hong J.DI Deyan LIU Junji YUAN Zengming CHEN Tiehu HE Weixin DING
• 来源期刊: 土壤圈（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: Review Article
• 页码范围: 231-242
• 页数: 12页
• 语种: 英文
• DOI: 10.1016/S1002-0160(20)60074-1

摘要

Nitrogen(N)losses in cropland resulting from the application of synthetic fertilizers decrease crop productivity and exacerbate environmental pollution.Mitigation measures,such as reduction in N fertilizer application rates,can have unintentional adverse effects on crop yield.We conducted a meta-analysis of soil N2O emissions from agricultural fields across China under contrasting mitigation scenarios as a novel approach to identify the most effective strategy for the mitigation of emissions of N2O derived from N fertilizer use in China.Current standard agricultural practice was used as a baseline scenario(BS),and 12 potential mitigation scenarios(S1-S12)were derived from the available literature and comprised single and combinations of management scenarios that accounted for crop yield.Mitigation scenarios S6(nitrification inhibitor 3,4-dimethylpyrazole phosphate)and S11(20％ reduction in N application rate plus nitrification inhibitor dicyandiamide)in maize,rice,and wheat crops led to an average 56.0％ reduction in N2O emissions at the national level,whereas scenario S4(nitrification inhibitor dicyandiamide)led to yield optimization,with a 14.0％ increase for maize and 8.0％ increase for rice as compared to the BS.Implementation of these most effective mitigation scenarios(S4,S6,and S11)might help China,as a signatory to the 2015 United Nations Framework Convention on Climate Change(Paris Agreement),to achieve a 30％ reduction in N2O emissions by 2030.