Climate Change Research ›› 2017, Vol. 13 ›› Issue (3): 273-283.doi: 10.12006/j.issn.1673-1719.2016.154

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Options and Potentials to Mitigate N2O Emissions from Wheat and Maize Fields in China

Li Xin1, 2, Sun Wenjuan1, Huang Yao1, Yu Lingfei1   

  1. 1 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-08-01 Revised:2016-10-27 Online:2017-05-30 Published:2017-05-30
  • Contact: Wenjuan SUN


Upland croplands are the main source of N2O emissions. Mitigation of N2O emissions from upland croplands will greatly contribute to an overall reduction of greenhouse gases from agriculture. Using 355 datasets extracted from 103 publications, a Meta-analysis was performed to investigate the mitigation options and potential of N2O emissions from wheat and maize fields in China. The results showed that application of inhibitors in wheat and maize fields reduced 36%-46% of the N2O emissions with an increase in crop yield. Cutting the application rates of nitrogen fertilizers by no more than 30% could reduce N2O emissions by 10%-18% without crop yield loss. Applications of slow (controlled-) release fertilizers and incorporations of crop residues could significantly mitigate N2O emissions from wheat fields, but the mitigation was not statistically significant in maize fields. The gross N2O emissions could be reduced by 9.29-13.90 Gg N2O-N per wheat season and 10.53-23.19 Gg N2O-N per maize season when different mitigation options were put into practices. The mitigation potential (MP) in wheat cultivation was particularly notable for Henan, Shandong, Hebei and Anhui provinces, accounting for 53% of the total MP in wheat fields. Heilongjiang, Jilin, Shandong, Hebei and Henan provinces showed high MP in maize cultivation, accounting for approximately 50% of the total MP in maize fields.

Key words: inhibitor, slow (controlled-) release fertilizer, reducing nitrogen rate, nitrous oxide, mitigation potential

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