globalchange  > 气候变化事实与影响
DOI: 10.1002/2016GB005515
Scopus记录号: 2-s2.0-85012096111
论文题名:
Declining spatial efficiency of global cropland nitrogen allocation
作者: Mueller N; D; , Lassaletta L; , Runck B; C; , Billen G; , Garnier J; , Gerber J; S
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期:2
起始页码: 245
结束页码: 257
语种: 英语
英文关键词: environmental nitrogen losses ; global cropland ; nitrogen allocation ; nitrogen use efficiency
Scopus关键词: agricultural development ; agricultural land ; agricultural technology ; agronomy ; crop production ; green revolution ; nitrogen ; nutrient use efficiency
英文摘要: Efficiently allocating nitrogen (N) across space maximizes crop productivity for a given amount of N input and reduces N losses to the environment. Here we quantify changes in the global spatial efficiency of cropland N use by calculating historical trade-off frontiers relating N inputs to possible N yield assuming efficient allocation. Time series cropland N budgets from 1961 to 2009 characterize the evolution of N input-yield response functions across 12 regions and are the basis for constructing trade-off frontiers. Improvements in agronomic technology have substantially increased cropping system yield potentials and expanded N-driven crop production possibilities. However, we find that these gains are compromised by the declining spatial efficiency of N use across regions. Since the start of the Green Revolution, N inputs and yields have moved farther from the optimal frontier over time; in recent years (1994–2009), global N surplus has grown to a value that is 69% greater than what is possible with efficient N allocation between regions. To reflect regional pollution and agricultural development goals, we construct scenarios that restrict reallocation, finding that these changes only slightly decrease potential gains in nitrogen use efficiency. Our results are inherently conservative due to the regional unit of analysis, meaning a larger potential exists than is quantified here for cross-scale policies to promote spatially efficient N use. ©2017. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77765
Appears in Collections:气候变化事实与影响

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作者单位: Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, United States; Department of Water, Agriculture and Food, PBL Netherlands Environmental Assessment Agency, The Hague, Netherlands; Department of Geography, Environment and Society, University of Minnesota, Twin Cities, Minneapolis, MN, United States; Centre National de la Recherche Scientifique, Université Pierre et Marie Curie, Paris, France; Institute on the Environment, University of Minnesota, Twin Cities, St. Paul, MN, United States

Recommended Citation:
Mueller N,D,, Lassaletta L,et al. Declining spatial efficiency of global cropland nitrogen allocation[J]. Global Biogeochemical Cycles,2017-01-01,31(2)
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