DOI: 10.1111/gcb.13455
论文题名: Can knowledge-based N management produce more staple grain with lower greenhouse gas emission and reactive nitrogen pollution? A meta-analysis
作者: Xia L. ; Lam S.K. ; Chen D. ; Wang J. ; Tang Q. ; Yan X.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期: 5 起始页码: 1917
结束页码: 1925
语种: 英语
英文关键词: cost and benefit
; grain yield
; greenhouse gas
; knowledge-based N management
; reactive N losses
Scopus关键词: Triticum aestivum
; Zea mays
英文摘要: Knowledge-based nitrogen (N) management, which is designed for a better synchronization of crop N demand with N supply, is critical for global food security and environmental sustainability. Yet, a comprehensive assessment on how these N management practices affect food production, greenhouse gas emission (GHG), and N pollution in China is lacking. We compiled the results of 376 studies (1166 observations) to evaluate the overall effects of seven knowledge-based N management practices on crop productivity, nitrous oxide (N2O) emission, and major reactive N (Nr) losses (ammonia, NH3; N leaching and runoff), for staple grain (rice, wheat, and corn) production in China. These practices included the application of controlled-release N fertilizer, nitrification inhibitor (NI) and urease inhibitor (UI), higher splitting frequency of fertilizer N application, lower basal N fertilizer (BF) proportion, deep placement of N fertilizer, and optimal N rate based on soil N test. Our results showed that, compared to traditional N management, these knowledge-based N practices significantly increased grain yields by 1.3–10.0%, which is attributed to the higher aboveground N uptake (5.1–12.1%) and N use efficiency in grain (8.0–48.2%). Moreover, these N management practices overall reduced GHG emission and Nr losses, by 5.4–39.8% for N2O emission, 30.7–61.5% for NH3 emission (except for the NI application), 13.6–37.3% for N leaching, and 15.5–45.0% for N runoff. The use of NI increased NH3 emission by 27.5% (9.0–56.0%), which deserves extra-attention. The cost and benefit analysis indicated that the yield profit of these N management practices exceeded the corresponding input cost, which resulted in a significant increase of the net economic benefit by 2.9–12.6%. These results suggest that knowledge-based N management practice can be considered an effective way to ensure food security and improve environmental sustainability, while increasing economic return. © 2016 John Wiley & Sons Ltd 资助项目: Yan, X.
; State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of SciencesChina
; 电子邮件: yanxy@issas.ac.cn
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60976
Appears in Collections: 影响、适应和脆弱性
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作者单位: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China; Crop and Soil Science Section, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Melbourne, VIC, Australia
Recommended Citation:
Xia L.,Lam S.K.,Chen D.,et al. Can knowledge-based N management produce more staple grain with lower greenhouse gas emission and reactive nitrogen pollution? A meta-analysis[J]. Global Change Biology,2017-01-01,23(5)