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Greenhouse gas emissions from synthetic nitrogen manufacture and fertilization for main upland crops in China.
- Source :
-
Carbon Balance & Management . 12/30/2019, Vol. 14 Issue 1, p1-10. 10p. 5 Charts, 3 Graphs, 1 Map. - Publication Year :
- 2019
-
Abstract
- Background: A significant source of greenhouse gas (GHG) emissions comes from the manufacture of synthetic nitrogen (N) fertilizers consumed in crop production processes. And the application of synthetic N fertilizers is recognized as the most important factor contributing to direct N2O emissions from agricultural soils. Based on statistical data and relevant literature, the GHG emissions associated with synthetic N manufacture and fertilization for wheat and maize in different provinces and agricultural regions of China were quantitatively evaluated in the present study. Results: During the 2015–2017 period, the average application rates of synthetic N for wheat and maize in upland fields of China were 222 and 197 kg ha−1, respectively. The total consumption of synthetic N on wheat and maize was 12.63 Mt year−1. At the national scale, the GHG emissions associated with the manufacture of synthetic N fertilizers were estimated to be 41.44 and 59.71 Mt CO2-eq year−1 for wheat and maize in China, respectively. And the direct N2O emissions derived from synthetic N fertilization were estimated to be 35.82 and 69.44 Gg N2O year−1 for wheat and maize, respectively. In the main wheat-cultivating regions of China, area-scaled GHG emissions were higher for Inner Mongolia, Jiangsu and Xinjiang provinces. And for maize, Gansu, Xinjiang, Yunnan, Shannxi and Jiangsu provinces had higher area-scaled GHG emissions. Higher yield-scaled GHG emissions for wheat and maize mainly occured in Yunnan and Gansu provinces. Conclusions: The manufacture and application of synthetic N fertilizers for wheat and maize in Chinese croplands is an important source of agricultural GHG emissions. The current study could provide a scientific basis for establishing an inventory of upland GHG emissions in China and developing appropriate mitigation strategies. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 17500680
- Volume :
- 14
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Carbon Balance & Management
- Publication Type :
- Academic Journal
- Accession number :
- 140956340
- Full Text :
- https://doi.org/10.1186/s13021-019-0133-9