| 引用本文: | 次珍,谢舒恬,张一泉,柯凡,尹一帆,谢璇,林晗琪,陈新芳,冯慕华.城市景观湖泊不同时间尺度CH4通量特征及影响因素分析——以南京市莫愁湖为例.湖泊科学,2024,36(3):782-793. DOI:10.18307/2024.0325 |
| Ci Zhen,Xie Shutian,Zhang Yiquan,Ke Fan,Yin Yifan,Xie Xuan,Lin Hanqi,Chen Xinfang,Feng Muhua.Characterization of CH4 fluxes in urban landscape lakes at different time scales and analysis of influencing factors—A case of Lake Mochou in Nanjing City. J. Lake Sci.2024,36(3):782-793. DOI:10.18307/2024.0325 |
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| 城市景观湖泊不同时间尺度CH4通量特征及影响因素分析——以南京市莫愁湖为例 |
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次珍1,2, 谢舒恬3, 张一泉2,4, 柯凡2, 尹一帆1,2, 谢璇1,2, 林晗琪2,5, 陈新芳1, 冯慕华2
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1.河海大学水文水资源学院,南京 210098;2.中国科学院南京地理与湖泊研究所,湖泊与环境国家重点实验室,南京 210008;3.湖南农业大学水利与土木工程学院,长沙 410128;4.中国科学院大学,北京 100049;5.南京信息工程大学应用气象学院,南京 210044
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| 摘要: |
| 城市景观湖泊对温室气体的收支发挥着重要作用。本文以南京市莫愁湖为研究对象,采用静态箱-温室气体分析仪法实时监测湖泊水-气界面CH4通量,分析湖泊主要温室气体CH4在日尺度和季节尺度上因冒泡和扩散排放方式不同对其通量的影响,探究影响湖泊CH4通量的因素。结果表明:(1)在日尺度上,四季24 h内CH4均呈排放状态,受白天冒泡影响,四季CH4总通量均存在白天高于夜间的日变化特征。(2)在季节尺度上,莫愁湖CH4排放通量呈现显著的时空异质性,受冒泡通量的影响夏季CH4通量明显高于春、秋、冬三季;B区的CH4总通量(6.04 nmol/(m2·s))显著高于A区(3.82 nmol/(m2·s)),水体的营养化程度和离岸距离是空间变化的主要影响因素。A、B两区CH4排放夏季以冒泡排放为主,春、秋、冬以扩散排放为主。(3)在日尺度上,CH4通量受气温、水温、辐射和风速等气象要素影响,与水质参数间的关系不显著;在季节尺度上,CH4通量与温度(气温、水温)、水体营养盐水平、叶绿素a浓度及富营养化程度的时间变化相一致,也随着水体透明度、pH和氧化还原电位的减小而呈增加的趋势。本研究为准确估算城市湖泊CH4排放量提供重要的数据基础。 |
| 关键词: 城市景观湖泊 莫愁湖 甲烷 日尺度 季节尺度 |
| DOI：10.18307/2024.0325 |
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| 基金项目:国家自然科学基金项目(41877482,41471075)、江苏省碳达峰碳中和科技创新专项资金(BK20220015)、中国科学院南京地理与湖泊研究所自主部署科研项目(NIGLAS2022G805)和江苏省高校水处理技术与材料协同创新中心项目联合资助。 |
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| Characterization of CH4 fluxes in urban landscape lakes at different time scales and analysis of influencing factors—A case of Lake Mochou in Nanjing City |
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Ci Zhen1,2, Xie Shutian3, Zhang Yiquan2,4, Ke Fan2, Yin Yifan1,2, Xie Xuan1,2, Lin Hanqi2,5, Chen Xinfang1, Feng Muhua2
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1.College of Hydrology and Water Resources, Hohai University, Nanjing 210098, P. R. China;2.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;3.College of Water Resources and Civil Engineering, Hunan Agricultural University, Changsha 410128, P. R. China;4.University of Chinese Academy of Sciences, Beijing 100049, P. R. China;5.School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China
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| Abstract: |
| Urban lakes play an important role in the balance of greenhouse gases. In this paper, we took Lake Mochou in Nanjing as the research object, and used the static box-greenhouse gas analyzer method to monitor the CH4 flux at the water-gas interface of the lake in real time, to analyze the influence of CH4, the main greenhouse gas of the lake, on its flux at the daily and seasonal scales due to the different emission modes of bubbling and diffusion, and to explore the factors influencing the fluxes of CH4 in the lake. The results showed that: (1) on the daily scale, CH4 was emitted during 24h in all seasons, and the total CH4 fluxes in all seasons were influenced by bubbling during the daytime, which was higher than that in the nighttime. (2) On the seasonal scale, the CH4 emission fluxes in Lake Mochou showed significant spatial and temporal heterogeneity, and the CH4 fluxes in summer were significantly higher than those in spring, autumn and winter due to the bubbling fluxes; the total CH4 fluxes in area B (6.04 nmol/(m2·s)) were significantly higher than those in area A (3.82 nmol/(m2·s)), and the nutrient level of the water body and the distance to the shoreline were the main factors for the spatial variations. CH4 emissions in A and B were dominated by bubbling emissions in summer and diffuse emissions in spring, autumn and winter. (3) On the daily scale, CH4 fluxes were influenced by meteorological elements such as air temperature, water temperature, radiation and wind speed, and the relationship with water quality parameters was not significant; on the seasonal scale, CH4 fluxes were consistent with temporal changes in temperature (air temperature and water temperature), nutrient levels in the water column, chlorophyll-a content and the degree of eutrophication, and also tended to increase with decreases in water clarity, pH, and redox potential. This study provides an important database for accurate estimation of CH4 emissions from urban lakes. |
| Key words: Urban landscape lake Lake Mochou methane daily scale seasonal scale |
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