| 来源类型 | Article
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| 规范类型 | 其他
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| DOI | 10.1073/pnas.0913658107
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| A high-resolution assessment on global nitrogen flows in cropland. |
| Liu J; You L; Amini M; Obersteiner M; Herrero M; Zehnder AJB; Yang H
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| 发表日期 | 2010
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| 出处 | Proceedings of the National Academy of Sciences 107 (17): 8035-8040
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| 出版年 | 2010
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| 语种 | 英语
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| 摘要 | Crop production is the single largest cause of human alteration of the global nitrogen cycle. We present a comprehensive assessment of global nitrogen flows in cropland for the year 2000 with a spatial resolution of 5 arc-minutes. We calculated a total nitrogen input (IN) of 136.60 trillion grams (Tg) of N per year, of which almost half is contributed by mineral nitrogen fertilizers, and a total nitrogen output (OUT) of 148.14 Tg of N per year, of which 55% is uptake by harvested crops and crop residues. We present high-resolution maps quantifying the spatial distribution of nitrogen IN and OUT flows, soil nitrogen balance, and surface nitrogen balance. The high-resolution data are aggregated at the national level on a per capita basis to assess nitrogen stress levels. The results show that almost 80% of African countries are confronted with nitrogen scarcity or nitrogen stress problems, which, along with poverty, cause food insecurity and malnutrition. The assesment also shows a global average nitrogen recovery rate of 59%, indicating that nearly two-fifths of nitrogen inputs are lost in ecosystems. More effective management of nitrogen is essential to reduce the deleterious environmental consequences. |
| 主题 | Forestry (FOR)
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| 关键词 | Global nitrogen cycle
Malnutrition
Nitrogen scarcity
Soil fertility
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| URL | http://pure.iiasa.ac.at/id/eprint/9236/
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| 来源智库 | International Institute for Applied Systems Analysis (Austria)
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| 引用统计 |
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| 资源类型 | 智库出版物
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| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/129038
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推荐引用方式
GB/T 7714 |
Liu J,You L,Amini M,et al. A high-resolution assessment on global nitrogen flows in cropland.. 2010.
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A%20high-resolution%20assessment%20on%20global%20nitrogen%20flows%20in%20cropland.pdf
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