气候变化领域集成服务门户(CCPortal): Spatial trends in the nitrogen budget of the African agro-food system over the past five decades

CCPortal

DOI	10.1088/1748-9326/ab5d9e
	Spatial trends in the nitrogen budget of the African agro-food system over the past five decades
	Elrys A.S.; Abdel-Fattah M.K.; Raza S.; Chen Z.; Zhou J.
发表日期	2019
ISSN	17489318
卷号	14 期号:12
英文摘要	Low nitrogen (N) fertilization is a dominant cause of malnutrition in Africa, but the spatial and temporal variability of N cycling patterns in Africa remain unclear. This study is the first to perform a detailed analysis of the N cycling patterns of 52 African countries from 1961 to 2016. We calculated the N use efficiency (NUE) in crop production, country-specific N fertilization trends, and the impacts of N fertilization on human protein demand and the environment. Over the past five decades, total N input to African croplands increased from 20 to 35 kg N ha-1 yr-1, while the application of synthetic N fertilizers (SNF) increased from 4.0 to 15 kg N ha-1 yr-1. N contributions from animal manure and biological N fixation remained lower than 10 kg N ha-1 yr-1 and 20 kg N ha-1 yr-1, respectively. The total N crop production increased from 15 to 22 kg N ha-1 yr-1 from 1961 to 2016. Total N surplus in Africa increased from 5 to 13 kg N ha-1 yr-1, while estimated gaseous losses increased from 4.0 to 11 kg N ha-1 yr-1. However, NUE declined from 74% to 63% during the past five decades, and protein consumption increased from 2.99 to 3.78 kg N capita-1 yr-1. These results suggest that Africa suffers from extremely low N input and that N loss is increasing in agricultural land. We recommend the implementation of an effective N management strategy incorporating the use of locally available organic material along with the balanced application of SNF. Such measures will require effective policy development and cooperation between all stakeholders. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	Africa; Human diet; Nitrogen (n) budget; Nloss; Nuse efficiency (nue)
语种	英语
scopus关键词	Agricultural runoff; Crops; Cultivation; Efficiency; Nitrogen fertilizers; Proteins; Africa; Human diet; Management strategies; Nloss; Nuse efficiency (nue); Organic materials; Policy development; Spatial and temporal variability; Budget control; fertilizer application; malnutrition; manure; nitrogen fixation; nutrient budget; organic compound; policy development; protein; spatial data; stakeholder; Africa; Animalia
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154226
作者单位	College of Natural Resources and Environment, Northwest AandF University, Yangling, Shaanxi, 712100, China; Soil Science Department, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Egypt; Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, 712100, China
推荐引用方式 GB/T 7714	Elrys A.S.,Abdel-Fattah M.K.,Raza S.,et al. Spatial trends in the nitrogen budget of the African agro-food system over the past five decades[J],2019,14(12).
APA	Elrys A.S.,Abdel-Fattah M.K.,Raza S.,Chen Z.,&Zhou J..(2019).Spatial trends in the nitrogen budget of the African agro-food system over the past five decades.Environmental Research Letters,14(12).
MLA	Elrys A.S.,et al."Spatial trends in the nitrogen budget of the African agro-food system over the past five decades".Environmental Research Letters 14.12(2019).