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

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

Agricultural region	Province	Direct N₂O emissions (Gg N₂O year⁻¹)
Agricultural region	Province	Wheat	Maize
NEC	Liaoning	–	3.38 ± 0.10
	Jilin	–	5.32 ± 0.16
	Heilongjiang	–	7.78 ± 0.66
NC	Hebei	2.71 ± 0.07	5.78 ± 0.27
	Shanxi	0.63 ± 0.07	3.65 ± 0.20
	Shandong	3.68 ± 0.05	7.12 ± 0.44
	Henan	4.92 ± 0.10	5.71 ± 0.12
	Inner Mongolia	1.01 ± 0.10	8.42 ± 0.78
MLYR	Jiangsu	8.32 ± 0.64	1.34 ± 0.14
	Anhui	7.22 ± 0.96	2.17 ± 0.27
	Hubei	2.20 ± 0.01	1.63 ± 0.06
NWC	Shaanxi	1.22 ± 0.13	2.96 ± 0.19
	Gansu	0.82 ± 0.04	2.85 ± 0.18
	Xinjiang	1.74 ± 0.10	2.59 ± 0.12
SSWC	Chongqing	–	0.71 ± 0.04
	Sichuan	0.89 ± 0.27	2.06 ± 0.32
	Guizhou	–	1.50 ± 0.28
	Yunnan	0.48 ± 0.09	3.50 ± 0.32
	Guangxi	–	0.97 ± 0.06

Values in the table represent mean ± standard deviation
NEC Northeast China, NC North China, MLYR Middle and lower reaches of Yangtze River, NWC Northwest China, SSWC South and Southwest China

ISSN: 1750-0680