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| DOI | 10.1111/gcb.17177 |
| A global meta-analysis of yield-scaled N2O emissions and its mitigation efforts for maize, wheat, and rice | |
| 发表日期 | 2024 |
| ISSN | 1354-1013 |
| EISSN | 1365-2486 |
| 起始页码 | 30 |
| 结束页码 | 2 |
| 卷号 | 30期号:2 |
| 英文摘要 | Maintaining or even increasing crop yields while reducing nitrous oxide (N2O) emissions is necessary to reconcile food security and climate change, while the metric of yield-scaled N2O emission (i.e., N2O emissions per unit of crop yield) is at present poorly understood. Here we conducted a global meta-analysis with more than 6000 observations to explore the variation patterns and controlling factors of yield-scaled N2O emissions for maize, wheat and rice and associated potential mitigation options. Our results showed that the average yield-scaled N2O emissions across all available data followed the order wheat (322 g N Mg-1, with the 95% confidence interval [CI]: 301-346) > maize (211 g N Mg-1, CI: 198-225) > rice (153 g N Mg-1, CI: 144-163). Yield-scaled N2O emissions for individual crops were generally higher in tropical or subtropical zones than in temperate zones, and also showed a trend towards lower intensities from low to high latitudes. This global variation was better explained by climatic and edaphic factors than by N fertilizer management, while their combined effect predicted more than 70% of the variance. Furthermore, our analysis showed a significant decrease in yield-scaled N2O emissions with increasing N use efficiency or in N2O emissions for production systems with cereal yields >10 Mg ha(-1) (maize), 6.6 Mg ha(-1) (wheat) or 6.8 Mg ha(-1) (rice), respectively. This highlights that N use efficiency indicators can be used as valuable proxies for reconciling trade-offs between crop production and N2O mitigation. For all three major staple crops, reducing N fertilization by up to 30%, optimizing the timing and placement of fertilizer application or using enhanced-efficiency N fertilizers significantly reduced yield-scaled N2O emissions at similar or even higher cereal yields. Our data-driven assessment provides some key guidance for developing effective and targeted mitigation and adaptation strategies for the sustainable intensification of cereal production. |
| 英文关键词 | climate change; crop yield; food security; maize; nitrous oxide; rice; wheat; yield-scaled emissions |
| 语种 | 英语 |
| WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
| WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
| WOS记录号 | WOS:001161442200001 |
| 来源期刊 | GLOBAL CHANGE BIOLOGY
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/291631 |
| 作者单位 | Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Helmholtz Association; Karlsruhe Institute of Technology; Aarhus University |
| 推荐引用方式 GB/T 7714 | . A global meta-analysis of yield-scaled N2O emissions and its mitigation efforts for maize, wheat, and rice[J],2024,30(2). |
| APA | (2024).A global meta-analysis of yield-scaled N2O emissions and its mitigation efforts for maize, wheat, and rice.GLOBAL CHANGE BIOLOGY,30(2). |
| MLA | "A global meta-analysis of yield-scaled N2O emissions and its mitigation efforts for maize, wheat, and rice".GLOBAL CHANGE BIOLOGY 30.2(2024). |
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