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Discussion papers
https://doi.org/10.5194/essd-2018-94
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2018-94
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Review article 18 Sep 2018

Review article | 18 Sep 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Science Data (ESSD).

Increased nitrogen enrichment and shifted patterns in the world’s grassland: 1860–2014

Rongting Xu1, Hanqin Tian1,2, Shufen Pan1, Shree R. S. Dangal1,3, Jian Chen1,4, Jinfeng Chang5, Yonglong Lu2, Ute Maria Skiba6, and Bowen Zhang1 Rongting Xu et al.
  • 1International Center for Climate and Global Change Research and School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36849, USA
  • 2Research Center for Eco-Environmental Sciences, State Key Laboratory of Urban and Regional Ecology, Chinese Academy of Sciences, Beijing 100085, China
  • 3Woods Hole Research Center, Falmouth, Massachusetts 02540, USA
  • 4Department of Computer Science and Software Engineering, Samuel Ginn College of Engineering, Auburn University, Auburn, AL 36849, USA
  • 5Laboratoire des Sciences du Climat et de l'Environnement, LSCE, 91191 Gif sur Yvette, Frane
  • 6Centre for Ecology and Hydrology, Bush Estate, Penicuik EH26 0QB, United Kingdom

Abstract. As the largest sector on the Earth’s land surface, the livestock system is not only a major contributor to global manure excreta that perturbs the global nutrient balance, but also a major emitter of greenhouse gases that warms the climate. Much attention has been paid to nitrogen (N) fertilizer and manure N applications to global croplands, however, there is still a lack of spatially-explicit estimates of continuous time-series datasets of manure and fertilizer N inputs in global grasslands. In this study, we therefore developed three global gridded datasets at a resolution of 0.5 degree×0.5 degree for the period 1860–2014 (i.e., annual manure N deposition rate, synthetic N fertilizer use rate, and manure N application rate) by combining annual and 5-arc minute spatial data on pasture and rangeland with country-level manure and synthetic fertilizer N data from the Food and Agricultural Organization database (FAOSTAT). We found that total N inputs, sum of manure N deposition, manure and fertilizer N application to global grassland systems increased from 15.5 to 103.8TgNyr−1 during 1860–2014. Manure N deposition accounted for 83.7% of the total N inputs, whereas manure and fertilizer N application accounted for 7.7% and 8.6%, respectively, during 2000–2014. At the regional scale, hotspots of manure N deposition remained the same during 1860–2014 (i.e., southern Asia, Africa, and South America), but hotspots of manure and fertilizer N application have shifted from Europe to southern Asia in the early 21st century. These three datasets could fill data gaps of N inputs in global and regional grasslands and serve as input drivers for ecosystem and biogeochemistry models to investigate the impacts of N enrichment on the global grassland system, greenhouse gas emissions, and environmental sustainability. Datasets available at https://doi.pangaea.de/10.1594/PANGAEA.892940.

Rongting Xu et al.
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Rongting Xu et al.
Data sets

Half-degree gridded manure and fertilizer nitrogen inputs in global grassland systems during 1860-2014 R. Xu, H. Tian, S. Pan, R. S. S. Dangal, J. Chen, J. Chang, Y. Lu, U. M. Skiba, and B. Zhang https://doi.pangaea.de/10.1594/PANGAEA.892940

Rongting Xu et al.
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Short summary
We provide three gridded datasets of manure and fertilizer N inputs in global grasslands at a resolution of 0.5° × 0.5° for the period 1860–2014 (i.e., annual manure N deposition rate, synthetic N fertilizer use rate, and manure N application rate). These three datasets could fill data gaps of N inputs in global and regional grasslands and serve as input drivers for ecosystem and biogeochemistry models.
We provide three gridded datasets of manure and fertilizer N inputs in global grasslands at a...
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