Methane Levels of a River Network in Wuxi City, China and Response to Water Governance
2020
Lingling Li | Renhua Yan | Bin Xue
The majority of rivers are a CH4 source that accounts for an important proportion of annual global emissions. However, CH4 evasion from urban river networks has received disproportionately less attention than their contribution. The effect of water governance on water quality and CH4 emission in urban areas remains unclear. Water quality, CH4 concentrations, and fluxes from a river network in Binhu District, Wuxi City, and their response to water governance were analyzed in this study. CH4 concentrations in the investigated rivers ranged from 0.05 &mu:mol L&minus:1 to 16.37 &mu:mol L&minus:1 (2.47 ±: 4.5 &mu:mol L&minus:1, medium 0.23 &mu:mol L&minus:1), and CH4 diffusive fluxes were 75.55 ±: 171.78 &mu:mol m&minus:2 h&minus:1 with a medium of 6.50 &mu:mol m&minus:2 h&minus:1. CH4 concentration showed a significant correlation with water quality parameters, especially for NH3&ndash:N (r = 0.84, p <: 0.001). Significant differences in water quality and CH4 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 CH4 efflux to the air can be achieved after extensive and intensified water governance.
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