| 引用本文: | 马琦,吕明权,王馨平,王垚,邢乔.丘陵山区不同富营养化塘库水体CO2、CH4排放特征.湖泊科学,2025,37(4):1237-1248. DOI:10.18307/2025.0415 |
| Ma Qi,Lv Mingquan,Wang Xinping,Wang Yao,Xing Qiao.CO2 and CH4 emission characteristics of eutrophic ponds and reservoirs in hilly and mountainous areas. J. Lake Sci.2025,37(4):1237-1248. DOI:10.18307/2025.0415 |
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| 摘要: |
| 池塘和小型水库作为中国数量最多、分布最广的水体，是碳收支核算的重要组成部分。随着塘库水体富营养化加剧，水体的碳排放过程发生变化，增加了塘库碳排放通量计算的不确定性。本研究以竹溪河流域2个池塘、3个水库为研究对象，开展为期9个月的水-气界面CO2 、CH4 通量监测，并在此基础上进一步探讨小型水体富营养化对CO2 、CH4 排放的影响。结果表明，中度富营养化塘库的CO2 、CH4 平均排放通量高于轻度富营养化、中营养的塘库，同时轻度富营养化塘库的CO2 、CH4 平均排放通量高于中营养塘库；对应的水-气界面中营养塘库的CO2 平均排放通量为17.32 mmol/(m2 ·d)，CH4 平均排放通量为0.42 mmol/(m2 ·d)；轻度富营养化塘库的CO2 平均排放通量为17.89 mmol/(m2 ·d)，CH4 平均排放通量为0.48 mmol/(m2 ·d)；中度富营养化塘库的CO2 平均排放通量为19.37 mmol/(m2 ·d)，CH4 平均排放通量为0.78 mmol/(m2 ·d)；整体表现为CO2 、CH4 的源。CO2 、CH4 排放通量与温度、溶解氧和pH等影响因素综合变化有关。随着小型水体塘库富营养水平的提高，CO2 、CH4 排放通量呈非线性增加的趋势，中度富营养化水体的CH4 排放通量约是中营养水体的2倍，这表明降低水体富营养水平可有效减少水体CH4 等温室气体的排放。因此，为准确估算和预测小型水体CO2 和CH4 等温室气体的排放量，应将富营养化水平作为潜在的影响因素。 |
| 关键词: 富营养化 塘库 CO2 通量 CH4 通量 影响因素 |
| DOI：10.18307/2025.0415 |
| 分类号: |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目(42071242)和重庆市水利局项目（CQS23C01036）联合资助 |
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| CO2 and CH4 emission characteristics of eutrophic ponds and reservoirs in hilly and mountainous areas |
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Ma Qi1，2，3，Lv Mingquan2，Wang Xinping1，2，3，Wang Yao2，Xing Qiao4
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1:Chongqing Jiaotong University, Chongqing 400074 ,P.R.China,2:Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714 ,P.R.China ,3:Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714 ,P.R.China ,4:Chongqing River Affairs Center, Chongqing 401147 ,P.R.China
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| Abstract: |
| The ponds and small reservoirs have a large number and wide distribution across China, and are thus an important component in the accounting of carbon balance. With the increasing eutrophication of these water bodies, the carbon emission processes changed considerable, increasing the uncertainty of calculating carbon emission fluxes of ponds/reservoirs. This study took two ponds and three reservoirs in the Zhuxi River Basin as the study areas. A nine-month monitoring of CO2 and CH4 fluxes was conducted at the water-air interface. Based on the monitoring results, the study investigated the impacts of eutrophication on CO2 and CH4 emissions in these small water bodies. The results showed that the average CO2 and CH4 emission fluxes were highest in the moderately eutrophic ponds/reservoirs, followed by lightly eutrophic ponds/reservoirs, and lowest in mesotrophic ponds/reservoirs. In mesotrophic ponds/reservoirs, the average CO2 and CH4 emission fluxes at the water-air interface were 17.32 and 0.42 mmol/(m2 ·d), respectively. In lightly eutrophic ponds/reservoirs, the average CO2 and CH4 emission fluxes were 17.89 and 0.48 mmol/(m2 ·d), respectively. In moderately eutrophic ponds/reservoirs, the average CO2 and CH4 emission fluxes were 19.37 and 0.78 mmol/(m2 ·d), respectively. Overall, the study found that these water bodies acted as sources of CO2 and CH4 . The CO2 and CH4 emission fluxes were influenced by various factors, including temperature, dissolved oxygen, and pH. With the increase in eutrophication of small water bodies, the emission fluxes of CO2 and CH4 howed a nonlinear increasing trend. The CH4 emission flux in moderately eutrophic water bodies was approximately twice that of mesotrophic waters, indicating that controlling eutrophication could effectively decrease greenhouse gas emission such as CH4 from water bodies. Therefore, to accurately estimate and predict greenhouse gas emissions such as CO2 and CH4 from small water bodies, eutrophication should be considered as a potential influencing factor. |
| Key words: Eutrophication ponds and reservoirs CO2 flux CH4 flux influencing factors |
