| DOI: | 10.1111/gcb.12413
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| 论文题名: | Optimizing rice yields while minimizing yield-scaled global warming potential |
| 作者: | Pittelkow C.M.; Adviento-Borbe M.A.; van Kessel C.; Hill J.E.; Linquist B.A.
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| 刊名: | Global Change Biology
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| ISSN: | 13541013
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| 出版年: | 2014
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| 卷: | 20, 期:5 | | 起始页码: | 1382
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| 结束页码: | 1393
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| 语种: | 英语
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| 英文关键词: | GHG emissions
; Greenhouse gas intensity
; Rice yield
; Synthetic N fertilizer
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| Scopus关键词: | crop production
; crop yield
; environmental impact
; fertilizer application
; global warming
; greenhouse gas
; methane
; nitrogen
; nitrous oxide
; rice
; yield response
; air pollutant
; fertilizer
; gas
; methane
; nitrogen
; nitrous oxide
; agriculture
; air pollutant
; analysis
; gas
; greenhouse effect
; greenhouse effect
; growth, development and aging
; metabolism
; rice
; trends
; Agriculture
; Air Pollutants
; Fertilizers
; Gases
; Global Warming
; Greenhouse Effect
; Methane
; Nitrogen
; Nitrous Oxide
; Oryza sativa
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| 英文摘要: | To meet growing global food demand with limited land and reduced environmental impact, agricultural greenhouse gas (GHG) emissions are increasingly evaluated with respect to crop productivity, i.e., on a yield-scaled as opposed to area basis. Here, we compiled available field data on CH4 and N2O emissions from rice production systems to test the hypothesis that in response to fertilizer nitrogen (N) addition, yield-scaled global warming potential (GWP) will be minimized at N rates that maximize yields. Within each study, yield N surplus was calculated to estimate deficit or excess N application rates with respect to the optimal N rate (defined as the N rate at which maximum yield was achieved). Relationships between yield N surplus and GHG emissions were assessed using linear and nonlinear mixed-effects models. Results indicate that yields increased in response to increasing N surplus when moving from deficit to optimal N rates. At N rates contributing to a yield N surplus, N2O and yield-scaled N2O emissions increased exponentially. In contrast, CH4 emissions were not impacted by N inputs. Accordingly, yield-scaled CH4 emissions decreased with N addition. Overall, yield-scaled GWP was minimized at optimal N rates, decreasing by 21% compared to treatments without N addition. These results are unique compared to aerobic cropping systems in which N2O emissions are the primary contributor to GWP, meaning yield-scaled GWP may not necessarily decrease for aerobic crops when yields are optimized by N fertilizer addition. Balancing gains in agricultural productivity with climate change concerns, this work supports the concept that high rice yields can be achieved with minimal yield-scaled GWP through optimal N application rates. Moreover, additional improvements in N use efficiency may further reduce yield-scaled GWP, thereby strengthening the economic and environmental sustainability of rice systems. © 2013 John Wiley & Sons Ltd. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/62252
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| Appears in Collections: | 影响、适应和脆弱性
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作者单位: | Department of Plant Sciences, University of California, Davis One Shields Ave, Davis, 95616, United States
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| Recommended Citation: | |
Pittelkow C.M.,Adviento-Borbe M.A.,van Kessel C.,et al. Optimizing rice yields while minimizing yield-scaled global warming potential[J]. Global Change Biology,2014-01-01,20(5)
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