| 张丹奕,刘艺轩,周旭东,唐珍妮,于志国.水分状况及温度对长江漫滩沉积物温室气体排放的影响：以南京绿水湾湿地为例[J].农业环境科学学报,2023,42(10):2358-2370. |
| 水分状况及温度对长江漫滩沉积物温室气体排放的影响：以南京绿水湾湿地为例 |
| 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 |
| 投稿时间：2022-11-26 |
| DOI：10.11654/jaes.2022-1212 |
| 中文关键词: 水分状况 温度 温室气体 长江漫滩 沉积物 溶解性有机质 增温潜势 |
| 英文关键词: moisture content temperature greenhouse gases(GHGs) Yangtze River floodplain sediments dissolved organic matter (DOM) global warming potential (GWP) |
| 基金项目:国家自然科学基金项目（41877337） |
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| 摘要点击次数: 726 |
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| 中文摘要: |
| 为探究水文波动和气候变暖对河流漫滩温室气体排放的影响，选取南京长江绿水湾湿地漫滩表层0~15 cm沉积物为实验对象，利用三维荧光光谱（3D-EEMs）等技术，结合室内培养实验，研究了2种水分状况（淹水和半淹水）和4种温度（5、15、20、30℃）下二氧化碳（CO2）、甲烷（CH4）、氧化亚氮（N2O）排放规律。结果表明：累积CO2排放量随温度及水分含量升高而升高，温度敏感系数（Q10）随温度升高而降低；淹水30℃处理下CO2排放速率在培养25 d后受到抑制而逐渐下降。淹水CH4累积排放量显著高于半淹水，且随温度升高而增加。淹水显著降低了沉积物净硝化速率，5℃半淹水N2O累积排放量显著高于淹水，但30℃淹水N2O累积排放显著高于半淹水。增温有利于加快淹水上覆水溶解性有机质（DOM）的腐殖化进程。研究表明，温度上升、水分含量增加均将导致沉积物排放的温室气体增温潜势（GWP）提高。 |
| 英文摘要: |
| 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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