›› 2019, Vol. 31 ›› Issue (11): 1909-1917.DOI: 10.3969/j.issn.1004-1524.2019.11.18

• Environmental Science • Previous Articles     Next Articles

Inventory and characteristics of agricultural nitrous oxide emissions in China

WEI Lianghuan, LIN Ning, MO Zhixin*   

  1. Xinjiang Biomass Solid Waste Resources Technology and Engineering Center, College of Chemistry and Environmental Science, Kashi University, Kashi 844006, China
  • Received:2019-06-25 Online:2019-11-25 Published:2019-12-04

Abstract: In the present study, agricultural N2O emissions inventory and characteristics of 31 provinces (municipalities, autonomous regions) were explored in 2000-2016 in China. It was shown that the agricultural N2O emission in China (Hongkong, Macau, Taiwan excluded) increased from 71.801 3×104 t in 2000 to 95.354 9×104 t in 2016, with an increase of 32.80% and an average annual increase of 1.79%. The N2O emission from agricultural land was the main source of agricultural N2O emission, which accounted for 63.47%-77.26%. There were obvious regional differences for the agricultural N2O emissions in 31 provinces (municipalities, autonomous regions). Guangxi, Guangdong and Yunnan showed the highest agricultural N2O emission, which was higher than that in Beijing, Shanghai and Tianjin. The highest N2O emission from agricultural land occurred in Guangxi, with an amount up to 45.320 2×104 t in 2016, while the lowest N2O emission from agricultural land occurred in Tibet, which was 0.005 3×104 t. Besides, the direct emission accounted for 69%-87% in the case of N2O emission from agricultural land. N2O emission from livestock and poultry manure management was relatively high in Sichuan, Henan, Inner Mongolia, Yunnan and Shandong, while it was relatively low in Shanghai, Beijing, Tianjin, Zhejiang and Hainan.

Key words: farmland, livestock and poultry manure, greenhouse gas

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