SUSTAINABLE NITROGEN MANAGEMENT INDEX: DEFINITION, GLOBAL ASSESSMENT AND POTENTIAL IMPROVEMENTS

作     者：Xin ZHANG Yanyu WANG Lena SCHULTE-UEBBING Wim DE VRIES Tan ZOU Eric ADAVIDSON Xin ZHANG;Yanyu WANG;Lena SCHULTE-UEBBING;Wim DE VRIES;Tan ZOU;Eric A.DAVIDSON

作者机构：University of Maryland Center for Environmental ScienceFrostburgMD 21532USA Environmental Systems Analysis GroupWageningen University&ResearchWageningen6708 PBthe Netherlands PBL Netherlands Environmental Assessment AgencyThe Hague2594 AVthe Netherlands. 

出 版 物：《Frontiers of Agricultural Science and Engineering》 (农业科学与工程前沿（英文版）)

年 卷 期：2022年第9卷第3期

页      面：356-365页

学科分类：07[理学] 0713[理学-生态学] 

基　　金：supported by the National Science Foundation(CNS-1739823 CBET-2047165 and CBET-2025826) 

主　　题：global assessment indicator nitrogen management sustainable agriculture sustainable development goals 

摘      要：To represent the sustainability of nitrogen management in the Sustainable Development Goals indicator framework,this paper proposes a sustainable nitrogen management index(SNMI).This index combines the performance in N crop yield and N use efficiency(NUE),thereby accounting for the need for both food production and environmental *** SNMI to countries around the world,the results showed improvement in the overall sustainability of crop N management over the past four decades,but this improvement has been mainly achieved by crop yield increase,while global NUE has improved only *** values vary largely among countries,and this variation has increased since the 1970s,implying different levels of success,even failure,in improving N management for countries around the *** the standard SNMI assessment,the reference NUE was defined as 1.0(considered an ideal NUE)and the reference yield was defined as 90 kg·ha^(−1)·yr^(−1) N(considering a globally averaged yield target for meeting food demand in 2050).A sensitivity test that replaced the reference NUE of 1.0 with more realistic NUE targets of 0.8 or 0.9 showed overall reduction in SNMI values(i.e.,improved performance),but little change in the ranking among *** another test that replaced the universal reference yield with region-specific attainable yield,SNMI values declined(i.e.,improved performance)for most countries in Africa and West Asia,whereas they increased for many countries in Europe and South *** index can be improved by further investigation of approaches for setting region-specific yield targets and high-quality data on crop yield ***,SNMI offers promise for a simple and transparent approach to assess progress of countries toward sustainable N management with a single indicator.