Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1088/1748-9326/aa9007 |
Nitrogen rate strategies for reducing yield-scaled nitrous oxide emissions in maize | |
Zhao, Xu1,2; Nafziger, Emerson D.1; Pittelkow, Cameron M.1 | |
2017-12-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS |
ISSN | 1748-9326 |
出版年 | 2017 |
卷号 | 12期号:12 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China |
英文摘要 | Mitigating nitrogen (N) losses from agriculture without negatively impacting crop productivity is a pressing environmental and economic challenge. Reductions in N fertilizer rate are often highlighted as a solution, yet the degree to which crop yields and economic returns may be impacted at the field-level remains unclear, in part due to limited data availability. Farmers are risk averse and potential yield losses may limit the success of voluntary N loss mitigation protocols, thus understanding field-level yield tradeoffs is critical to inform policy development. Using a case study of soil N2O mitigation in the US Midwest, we conducted an ex-post assessment of two economic and two environmental N rate reduction strategies to identify promising practices for maintaining maize yields and economic returns while reducing N2O emissions per unit yield (i.e. yield-scaled emissions) compared to an assumed baseline N input level. Maize yield response data from 201 on-farm N rate experiments were combined with an empirical equation predicting N2O emissions as a function of N rate. Results indicate that the economic strategy aimed at maximizing returns to N (MRTN) led to moderate but consistent reductions in yield-scaled N2O emissions with small negative impacts on yield and slight increases in median returns. The economic optimum N rate strategy reduced yield-scaled N2O emissions in 75% of cases but increased them otherwise, challenging the assumption that this strategy will automatically reduce environmental impacts per unit production. Both environmental strategies, one designed to increase N recovery efficiency and one to balance N inputs with grain N removal, further reduced yield-scaled N2O emissions but were also associated with negative yield penalties and decreased returns. These results highlight the inherent tension between achieving agronomic and economic goals while reducing environmental impacts which is often overlooked in policy discussions. To enable the development of more scalable environmental N loss mitigation strategies, yield tradeoffs occurring at the critical point of adoption (i.e. the farm-level) should be considered. |
英文关键词 | maize yield economic optimum N rate N2O mitigation N recovery efficiency N surplus yield-scaled N2O emissions |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000417530700004 |
WOS关键词 | N2O EMISSIONS ; AGRONOMIC ASSESSMENT ; SOIL ; US |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/26131 |
专题 | 气候变化 |
作者单位 | 1.Univ Illinois, Dept Crop Sci, Urbana, IL 61801 USA; 2.Chinese Acad Sci, State Key Lab Soil & Sustainable Agr, Changshu Natl Agroecosyst Observat & Res Stn, Inst Soil Sci, 71 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China |
推荐引用方式 GB/T 7714 | Zhao, Xu,Nafziger, Emerson D.,Pittelkow, Cameron M.. Nitrogen rate strategies for reducing yield-scaled nitrous oxide emissions in maize[J]. ENVIRONMENTAL RESEARCH LETTERS,2017,12(12). |
APA | Zhao, Xu,Nafziger, Emerson D.,&Pittelkow, Cameron M..(2017).Nitrogen rate strategies for reducing yield-scaled nitrous oxide emissions in maize.ENVIRONMENTAL RESEARCH LETTERS,12(12). |
MLA | Zhao, Xu,et al."Nitrogen rate strategies for reducing yield-scaled nitrous oxide emissions in maize".ENVIRONMENTAL RESEARCH LETTERS 12.12(2017). |
条目包含的文件 | 条目无相关文件。 |
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