Related Experiment Video
Updated: Jan 8, 2026

Design and Construction of an Urban Runoff Research Facility
Published on: August 8, 2014
Nutrient drivers and ecological restoration modulate greenhouse gas emissions from contrasting urban rivers
Xiaokang Tian1, Menglin Liu1, Dongyang Tan1
1School of Environmental Ecology and Biological Engineering, Hubei Key Laboratory of Microbial Transformation and Regulation of Biogenic Elements in the Middle Reaches of the Yangtze River, Wuhan Institute of Technology, Wuhan, 430205, China.
Abstract:
Urban rivers play a critical role in regional carbon cycling, yet their greenhouse gas (GHG) emissions are shaped by interactions between ecological restoration and urban pollution. Despite increasing attention, knowledge gaps remain regarding how nutrient variations and ecological restoration affect spatiotemporal dynamics of GHG fluxes in urban waterways. This study addressed this by comparing two representative urban rivers: an ecologically restored river (QSG) and a treated wastewater-receiving polluted river (XSH). Field sampling was carried out across multiple seasons, and CO2 (carbon dioxide), CH4 (methane), and N2O (nitrous oxide) concentrations and fluxes via water-air interface were measured using the headspace equilibrium method, which may slightly underestimate CH4 because of unaccounted ebullition. GHG fluxes exhibited notable spatial and seasonal variations, with significantly higher values in the wet season. Fluxes were significantly higher in the polluted river XSH (FCO2: 150.97 ± 162.22 mmol/m2/d; FCH4: 0.22 ± 0.58 mmol/m2/d; FN2O: 113.04 ± 123.05 μmol/m2/d) than in the restored QSG (FCO2: 38.11 ± 58.07 mmol/m2/d; FCH4: 0.03 ± 0.08 mmol/m2/d; FN2O: 7.78 ± 27.71 μmol/m2/d). FCO2 and FN2O were most strongly associated with total dissolved nitrogen (TDN), whereas FCH4 was predominantly related to ammonium (NH4+-N). These findings emphasize the substantial impact of urban pollution on riverine GHG dynamics and demonstrate the mitigating potential of ecological restoration. The study offers critical insights for urban river management targeting climate change mitigation through nutrient and wastewater management.
More Related Videos
Related Concept Videos
Bioremediation
Ecological Disturbance
Environmental Applications of Microorganisms
The Carbon Cycle
Adaptations that Reduce Water Loss
Metabolism of Chemolithotrophs

