期刊
ENVIRONMENTAL RESEARCH LETTERS
卷 9, 期 10, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1748-9326/9/10/105011
关键词
nitrogen use efficiency; country and global scales; cropping systems; crop yields; nitrogen pollution
资金
- SeasERA EMoSEM project [ANR-12-SEAS-0005-01]
- Agence Nationale de la Recherche (ANR) [ANR-12-SEAS-0005] Funding Source: Agence Nationale de la Recherche (ANR)
Nitrogen (N) is crucial for crop productivity. However, nowadays more than half of the N added to cropland is lost to the environment, wasting the resource, producing threats to air, water, soil and biodiversity, and generating greenhouse gas emissions. Based on FAO data, we have reconstructed the trajectory followed, in the past 50 years, by 124 countries in terms of crop yield and total nitrogen inputs to cropland (manure, synthetic fertilizer, symbiotic fixation and atmospheric deposition). During the last five decades, the response of agricultural systems to increased nitrogen fertilization has evolved differently in the different world countries. While some countries have improved their agro-environmental performances, in others the increased fertilization has produced low agronomical benefits and higher environmental losses. Our data also suggest that, in general, those countries using a higher proportion of N inputs from symbiotic N fixation rather than from synthetic fertilizer have a better N use efficiency.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据