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231225s2021 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.15736
|2 doi
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|a pubmed25n1087.xml
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|a (DE-627)NLM326377905
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|a (NLM)34089542
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Huang, Hao
|e verfasserin
|4 aut
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| 245 |
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|a Significant contributions of combustion-related NH3 and non-fossil fuel NOx to elevation of nitrogen deposition in southwestern China over past five decades
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|c 2021
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 17.08.2021
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|a Date Revised 17.08.2021
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2021 John Wiley & Sons Ltd.
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|a Anthropogenic nitrogen (N) emissions and deposition have been increasing over past decades. However, spatiotemporal variations of N deposition levels and major sources remain unclear in many regions, which hinders making strategies of emission mitigation and evaluating effects of elevated N deposition. By investigating moss N contents and δ15 N values in southwestern (SW) China in 1954-1964, 1970-1994, and 2005-2015, we reconstructed fluxes and source contributions of atmospheric ammonium ( NH 4 + ) and nitrate ( NO 3 - ) deposition and evaluated their historical changes. For urban and non-urban sites, averaged moss N contents did not differ between 1954-1964 and 1970-1994 (1.2%-1.3%) but increased distinctly in 2005-2015 (1.6%-2.3%), and averaged moss δ15 N values decreased from +0.4‰ to +3.3‰ in 1954-1964 to -1.9‰ to -0.7‰ in 1974-1990, and to -4.8‰ to -3.6‰ in 2005-2015. Based on quantitative estimations, N deposition levels from the 1950s to the 2000s did not change in the earlier 20 years but were elevated substantially in the later 30 years. Moreover, the elevation of NH 4 + deposition (by 12.2 kg-N/ha/year at urban sites and 4.6 kg-N/ha/year at non-urban sties) was higher than that of NO 3 - deposition (by 6.0 and 2.9 kg-N/ha/year, respectively) in the later 30 years. This caused a shifted dominance from NO 3 - to NH 4 + in N deposition. Based on isotope source apportionments, contributions of combustion-related NH3 sources (vehicle exhausts, coal combustion, and biomass burning) to the elevation of NH 4 + deposition were two times higher than volatilization NH3 sources (wastes and fertilizers) in the later 30 years. Meanwhile, non-fossil fuel NOx sources (biomass burning, microbial N cycles) contributed generally more than fossil fuel NOx sources (vehicle exhausts and coal combustion) to the elevation of NO 3 - deposition. These results revealed significant contributions of combustion-related NH3 and non-fossil fuel NOx emissions to the historical elevation of N deposition in SW China, which is useful for emission mitigation and ecological effect evaluation of atmospheric N loading
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|a Journal Article
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|a ammonia
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| 650 |
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|a ammonium
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| 650 |
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4 |
|a atmospheric nitrogen deposition
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| 650 |
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4 |
|a bioindication
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| 650 |
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4 |
|a environmental changes
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| 650 |
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4 |
|a moss
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| 650 |
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4 |
|a nitrate
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| 650 |
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4 |
|a nitrogen oxides
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| 650 |
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4 |
|a nitrogen stable isotope
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| 650 |
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4 |
|a source apportionment
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| 650 |
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|a Air Pollutants
|2 NLM
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| 650 |
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7 |
|a Nitrogen
|2 NLM
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| 650 |
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7 |
|a N762921K75
|2 NLM
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| 700 |
1 |
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|a Song, Wei
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Liu, Xue-Yan
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Global change biology
|d 1999
|g 27(2021), 18 vom: 15. Sept., Seite 4392-4402
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnas
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| 773 |
1 |
8 |
|g volume:27
|g year:2021
|g number:18
|g day:15
|g month:09
|g pages:4392-4402
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| 856 |
4 |
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|u http://dx.doi.org/10.1111/gcb.15736
|3 Volltext
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|d 27
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|e 18
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|h 4392-4402
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