Methane Levels of a River Network in Wuxi City, China and Response to Water Governance
The majority of rivers are a CH<sub>4</sub> source that accounts for an important proportion of annual global emissions. However, CH<sub>4</sub> evasion from urban river networks has received disproportionately less attention than their contribution. The effect of water gover...
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doaj-51d91fc5ade44230815164a4143037852020-11-25T01:25:27ZengMDPI AGWater2073-44412020-09-01122617261710.3390/w12092617Methane Levels of a River Network in Wuxi City, China and Response to Water GovernanceLingling Li0Renhua Yan1Bin Xue2College of Geography Science, Nanjing Normal University, Nanjing 210008, ChinaState Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210045, ChinaState Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210045, ChinaThe majority of rivers are a CH<sub>4</sub> source that accounts for an important proportion of annual global emissions. However, CH<sub>4</sub> evasion from urban river networks has received disproportionately less attention than their contribution. The effect of water governance on water quality and CH<sub>4</sub> emission in urban areas remains unclear. Water quality, CH<sub>4</sub> concentrations, and fluxes from a river network in Binhu District, Wuxi City, and their response to water governance were analyzed in this study. CH<sub>4</sub> concentrations in the investigated rivers ranged from 0.05 μmol L<sup>−1</sup> to 16.37 μmol L<sup>−1</sup> (2.47 ± 4.5 μmol L<sup>−1</sup>, medium 0.23 μmol L<sup>−1</sup>), and CH<sub>4</sub> diffusive fluxes were 75.55 ± 171.78 μmol m<sup>−2</sup> h<sup>−1</sup> with a medium of 6.50 μmol m<sup>−2</sup> h<sup>−1</sup>. CH<sub>4</sub> concentration showed a significant correlation with water quality parameters, especially for NH<sub>3</sub>–N (r = 0.84, <i>p</i> < 0.001). Significant differences in water quality and CH<sub>4</sub> levels were found between sites that had conducted water management and those that continued to exhibit poor water quality. Our analysis showed that rivers under water governance have a positive tendency toward water ecological restoration, and a significant decrease in CH<sub>4</sub> efflux to the air can be achieved after extensive and intensified water governance.https://www.mdpi.com/2073-4441/12/9/2617methaneurban riverwater qualitywater governance |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lingling Li Renhua Yan Bin Xue |
spellingShingle |
Lingling Li Renhua Yan Bin Xue Methane Levels of a River Network in Wuxi City, China and Response to Water Governance Water methane urban river water quality water governance |
author_facet |
Lingling Li Renhua Yan Bin Xue |
author_sort |
Lingling Li |
title |
Methane Levels of a River Network in Wuxi City, China and Response to Water Governance |
title_short |
Methane Levels of a River Network in Wuxi City, China and Response to Water Governance |
title_full |
Methane Levels of a River Network in Wuxi City, China and Response to Water Governance |
title_fullStr |
Methane Levels of a River Network in Wuxi City, China and Response to Water Governance |
title_full_unstemmed |
Methane Levels of a River Network in Wuxi City, China and Response to Water Governance |
title_sort |
methane levels of a river network in wuxi city, china and response to water governance |
publisher |
MDPI AG |
series |
Water |
issn |
2073-4441 |
publishDate |
2020-09-01 |
description |
The majority of rivers are a CH<sub>4</sub> source that accounts for an important proportion of annual global emissions. However, CH<sub>4</sub> evasion from urban river networks has received disproportionately less attention than their contribution. The effect of water governance on water quality and CH<sub>4</sub> emission in urban areas remains unclear. Water quality, CH<sub>4</sub> concentrations, and fluxes from a river network in Binhu District, Wuxi City, and their response to water governance were analyzed in this study. CH<sub>4</sub> concentrations in the investigated rivers ranged from 0.05 μmol L<sup>−1</sup> to 16.37 μmol L<sup>−1</sup> (2.47 ± 4.5 μmol L<sup>−1</sup>, medium 0.23 μmol L<sup>−1</sup>), and CH<sub>4</sub> diffusive fluxes were 75.55 ± 171.78 μmol m<sup>−2</sup> h<sup>−1</sup> with a medium of 6.50 μmol m<sup>−2</sup> h<sup>−1</sup>. CH<sub>4</sub> concentration showed a significant correlation with water quality parameters, especially for NH<sub>3</sub>–N (r = 0.84, <i>p</i> < 0.001). Significant differences in water quality and CH<sub>4</sub> levels were found between sites that had conducted water management and those that continued to exhibit poor water quality. Our analysis showed that rivers under water governance have a positive tendency toward water ecological restoration, and a significant decrease in CH<sub>4</sub> efflux to the air can be achieved after extensive and intensified water governance. |
topic |
methane urban river water quality water governance |
url |
https://www.mdpi.com/2073-4441/12/9/2617 |
work_keys_str_mv |
AT linglingli methanelevelsofarivernetworkinwuxicitychinaandresponsetowatergovernance AT renhuayan methanelevelsofarivernetworkinwuxicitychinaandresponsetowatergovernance AT binxue methanelevelsofarivernetworkinwuxicitychinaandresponsetowatergovernance |
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