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Enhanced nitrous oxide emissions caused by atmospheric nitrogen deposition in agroecosystems over China.
- Source :
-
Environmental science and pollution research international [Environ Sci Pollut Res Int] 2021 Mar; Vol. 28 (12), pp. 15350-15360. Date of Electronic Publication: 2020 Nov 24. - Publication Year :
- 2021
-
Abstract
- Atmospheric nitrogen (N) deposition in China has been the largest worldwide. Yet the impacts of atmospheric N deposition on soil N <subscript>2</subscript> O emissions were often ignored by previous studies. Thus, we investigated how N deposition affected N <subscript>2</subscript> O emissions over China using the process-based model (DNDC, DeNitrification-DeComposition). Total soil N inputs were 194 kg N ha <superscript>-1</superscript> in agricultural systems over China in 2010, including chemical N fertilizer (78%), atmospheric N deposition (12%), and crop residues N (10%). Annual N <subscript>2</subscript> O emissions induced by N deposition were estimated at 97 Gg N, occupying 43% of total soil N <subscript>2</subscript> O emissions (228 Gg N) in agricultural systems over China. In particular, the largest N <subscript>2</subscript> O emissions caused by atmospheric N deposition were found in South China, followed by North China Plain and Southwest China. The efficiency of N deposition generating N <subscript>2</subscript> O emissions (3.0%) over China was 4 times than that of N fertilizer (0.7%). N <subscript>2</subscript> O emissions induced by N deposition increased from 81 Gg in 2000 to 93 Gg in 2014 (by 1% yr <superscript>-1</superscript> ), which was consistent with the long-term trend of N deposition. This suggests N deposition accelerated soil N <subscript>2</subscript> O emissions largely contributing to global warming. Our results also indicated that 62% and 10% of soil N <subscript>2</subscript> O emissions were reduced by applying a nitrification inhibitor and N fertilizer with 20% decrease. We highlight the significance of considering N deposition in determining total soil N <subscript>2</subscript> O emissions over China. The results provide an important scientific basis for the prediction of greenhouse effect caused by N deposition over China.
- Subjects :
- Agriculture
China
Fertilizers analysis
Soil
Nitrogen
Nitrous Oxide analysis
Subjects
Details
- Language :
- English
- ISSN :
- 1614-7499
- Volume :
- 28
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Environmental science and pollution research international
- Publication Type :
- Academic Journal
- Accession number :
- 33236298
- Full Text :
- https://doi.org/10.1007/s11356-020-11591-5