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Table 3 Estimated average annual direct N2O emissions from synthetic N fertilization for wheat and maize in different provinces of China (2015–2017)

From: Greenhouse gas emissions from synthetic nitrogen manufacture and fertilization for main upland crops in China

Agricultural regionProvinceDirect N2O emissions (Gg N2O year−1)
WheatMaize
NECLiaoning3.38 ± 0.10
Jilin5.32 ± 0.16
Heilongjiang7.78 ± 0.66
NCHebei2.71 ± 0.075.78 ± 0.27
Shanxi0.63 ± 0.073.65 ± 0.20
Shandong3.68 ± 0.057.12 ± 0.44
Henan4.92 ± 0.105.71 ± 0.12
Inner Mongolia1.01 ± 0.108.42 ± 0.78
MLYRJiangsu8.32 ± 0.641.34 ± 0.14
Anhui7.22 ± 0.962.17 ± 0.27
Hubei2.20 ± 0.011.63 ± 0.06
NWCShaanxi1.22 ± 0.132.96 ± 0.19
Gansu0.82 ± 0.042.85 ± 0.18
Xinjiang1.74 ± 0.102.59 ± 0.12
SSWCChongqing0.71 ± 0.04
Sichuan0.89 ± 0.272.06 ± 0.32
Guizhou1.50 ± 0.28
Yunnan0.48 ± 0.093.50 ± 0.32
Guangxi0.97 ± 0.06
  1. Values in the table represent mean ± standard deviation
  2. NEC Northeast China, NC North China, MLYR Middle and lower reaches of Yangtze River, NWC Northwest China, SSWC South and Southwest China