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Elevated nitrogen loadings facilitate carbon dioxide emissions from urban inland waters.
- Source :
-
Journal of environmental management [J Environ Manage] 2024 Jun; Vol. 361, pp. 121268. Date of Electronic Publication: 2024 May 30. - Publication Year :
- 2024
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Abstract
- Carbon dioxide (CO <subscript>2</subscript> ) production and emissions from inland waters play considerable roles in global atmospheric CO <subscript>2</subscript> sources, while there are still uncertainties regarding notable nutrient inputs and anthropogenic activities. Urban inland waters, with frequently anthropogenic modifications and severely nitrogen loadings, were hotspots for CO <subscript>2</subscript> emissions. Here, we investigated the spatiotemporal patterns of partial pressure of CO <subscript>2</subscript> (pCO <subscript>2</subscript> ) and CO <subscript>2</subscript> fluxes (FCO <subscript>2</subscript> ) in typical urban inland waters in Tianjin, China. Our observation indicated that pCO <subscript>2</subscript> values were oversaturated in highly polluted waters, particularly in sewage rivers and urban rivers, exhibiting approximately 9 times higher than the atmosphere equilibrium concentration during sampling campaigns. Obviously, the spatiotemporal distributions of pCO <subscript>2</subscript> and FCO <subscript>2</subscript> emphasized that the water environmental conditions and anthropogenic activities jointly adjusted primary productivity and biological respiration of inland waters. Meanwhile, statistically positive correlations between pCO <subscript>2</subscript> /FCO <subscript>2</subscript> and NH <subscript>4</subscript> <superscript>+</superscript> -N/NO <subscript>3</subscript> <superscript>-</superscript> -N (p < 0.05) suggested that nitrogen biogeochemical processes, especially the nitrification, played a dominant role in CO <subscript>2</subscript> emissions attributing to the water acidification that stimulated CO <subscript>2</subscript> production and emissions. Except for slight CO <subscript>2</subscript> sinks in waters with low organic contents, the total CO <subscript>2</subscript> emissions from the urban surface waters of Tianjin were remarkable (286.8 Gg yr <superscript>-1</superscript> ). The results emphasized that the reductions of nitrogen loadings, sewage draining waters, and agricultural pollution could alleviate CO <subscript>2</subscript> emissions from urban inland waters.<br />Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2024 Elsevier Ltd. All rights reserved.)
Details
- Language :
- English
- ISSN :
- 1095-8630
- Volume :
- 361
- Database :
- MEDLINE
- Journal :
- Journal of environmental management
- Publication Type :
- Academic Journal
- Accession number :
- 38820787
- Full Text :
- https://doi.org/10.1016/j.jenvman.2024.121268