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| Effects of moisture content and temperature on greenhouse gas emission from sediments in the Yangtze River floodplain: a case study of the Nanjing Lvshuiwan Wetland |
| Received:November 26, 2022 |
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| KeyWord:moisture content;temperature;greenhouse gases(GHGs);Yangtze River floodplain;sediments;dissolved organic matter (DOM);global warming potential (GWP) |
| Author Name | Affiliation | E-mail | | ZHANG Danyi | School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China
Key Laboratory of Hydrometeorological Disaster Mechanism and Warning of Ministry of Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | LIU Yixuan | School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China
Key Laboratory of Hydrometeorological Disaster Mechanism and Warning of Ministry of Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | ZHOU Xudong | Nanjing Hydraulic Research Institute, Nanjing 210000, China | | | TANG Zhenni | School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China
Key Laboratory of Hydrometeorological Disaster Mechanism and Warning of Ministry of Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | YU Zhiguo | School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China
Key Laboratory of Hydrometeorological Disaster Mechanism and Warning of Ministry of Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China | yuzhiguoiae@gmail.com |
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| Abstract: |
| This study was conducted to explore the influence of hydrological fluctuations and global warming on the emission of greenhouse gases(GHGs)from river floodplains. Surface sediments(0-15 cm)from the Yangtze River floodplain within the Nanjing Lvshuiwan Wetland were collected, and an incubation experiment was conducted using two soil moisture levels(flooding and semi-flooding)and four temperature levels(5, 15, 20℃, and 30℃). Three-dimensional fluorescence spectroscopy(3D-EEMs)and other methods were employed to assess the emission patterns of carbon dioxide(CO2), methane(CH4), and nitrous oxide(N2O)under the various conditions. The results showed that cumulative CO2 emission increased with increasing temperature and moisture content, and it showed a reciprocal result with the temperature sensitivity index(Q10). However, CO2 emission in the 30℃ treatment under flooding conditions was lower for 25 days of incubation and then gradually decreased. Similarly, cumulative CH4 emission was significantly higher under flooding than under semiflooding conditions, and it showed a positive correlation with temperature. The net nitrification rates of sediment were significantly reduced under flooding conditions, although the cumulative emission of N2O at 5℃ was significantly higher in the semi-flooding than that in the flooding treatments; however, at 30℃, the cumulative emission of N2O was significantly higher in the flooding treatment. The findings of this study confirm that warming plays a crucial role to accelerates the humification process of overlying water-dissolved organic matter (DOM)under flooding conditions. The results indicate that warming and increased moisture will lead to an increase in the global warming potential (GWP)of GHGs emitted by sediments. |
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