| 巢湖二氧化碳排放特征及其潜在影响因素 |
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| 引用本文： | 李宇阳,朱俊羽,俞晓琴,陈慧敏,郭燕妮,周永强,周蕾.巢湖二氧化碳排放特征及其潜在影响因素[J].中国环境科学,2022,42(1):425-433. |
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| 作者姓名： | 李宇阳 朱俊羽 俞晓琴 陈慧敏 郭燕妮 周永强 周蕾 |
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| 作者单位： | 1. 中国科学院南京地理与湖泊研究所, 江苏 南京 210008;2. 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 江西 南昌 330031;3. 中国科学院大学, 北京 100049 |
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| 基金项目： | 国家自然科学基金资助项目(41807362);中国科学院青年创新促进会会员(2021312);江苏省自然科学基金资助项目(BK20181104);中国科学院南京地理与湖泊研究所青年科学家小组(E1SL002) |
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| 摘 要： | 为探讨浅水湖泊CO2排放的时空格局及与CDOM来源组成潜在关联机制,于1月(枯水期)、4月(平水期)、7月(丰水期)不同水文情景下富营养浅水巢湖进行野外观测,采用扩散系数—顶空瓶法观测表层水体CO2浓度(cCO2)和通量(FCO2),并探讨CO2排放的潜在驱动因素,尤其是对CDOM来源组成的响应机制.结果表明,巢湖全湖...
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| 关 键 词： | 巢湖 二氧化碳(CO2) 通量 有色可溶性有机物(CDOM) 平行因子分析(PARAFAC) |
| 收稿时间： | 2021-05-27 |
Emission of carbon dioxide from Lake Chaohu and the potential influencing factors |
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| LI Yu-yang,ZHU Jun-yu,YU Xiao-qin,CHEN Hui-min,GUO Yan-ni,ZHOU Yong-qiang,ZHOU Lei.Emission of carbon dioxide from Lake Chaohu and the potential influencing factors[J].China Environmental Science,2022,42(1):425-433. |
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| Authors: | LI Yu-yang ZHU Jun-yu YU Xiao-qin CHEN Hui-min GUO Yan-ni ZHOU Yong-qiang ZHOU Lei |
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| Institution: | 1. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;2. Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Resources Environmental & Chemical Engineering, Nanchang University, Nanchang 330031, China;3. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Water samples from Lake Chaohu were collected in January (dry), April (wet-to-dry transition), and July (wet) to explore the variability of CO2 emissions from the shallow lake and the corresponding linkage with the sources and optical composition of CDOM. We coupled diffusion coefficient and mass balance approaches to trace the variability of dissolved CO2 concentration (cCO2) and CO2 efflux (FCO2) from Lake Chaohu, and further explore the potential drivers, especially the potential linkage between CO2 emissions and the optical composition of CDOM. Our results showed that the mean cCO2 of the whole lake area in Chaohu was higher in the wet season ((51.9±71.8)μmol/L) than in the wet-to-dry transition season ((48.9±29.0)μmol/L), and further higher than in the dry season ((35.2±15.6)μmol/L). We observed a slight sink of CO2 in the lake in the dry season ((-98.8±20.1)mg/(m2·d)), and there was no significant difference between the mean FCO2 in the wet season ((219.3±275.5)mg/(m2·d)) and the wet-to-dry transition season ((219.9±157.8)mg/(m2·d)). We found higher mean cCO2 and FCO2 in the western than in the central and further higher than in the eastern area of Lake Chaohu. In the western area of Lake Chaohu, dissolved oxygen (DO) was negatively correlated with cCO2(P<0.05) and FCO2(P<0.001); and we further found that both cCO2 and FCO2 increased with increasing dissolved organic carbon (DOC) (P<0.01) and chlorophyll-a(Chl-a) (P<0.001). Parallel factor analysis coupled with excitation-emission matrices revealed four fluorescent components, and both cCO2 and FCO2 increased with increasing humic-rich components C1 (P<0.01) and C4 (P<0.001). No significant correlation was found between cCO2, FCO2 and tryptophan-like C2, or beteween cCO2, FCO2 and tyrosine-like C3. Our results suggested that elevated trophic level potentially drive the emission of CO2 from Lake Chaohu, and the source and composition of CDOM, especially the input of terrestrial humic-rich substances, potentially favors the emission of CO2 from the lake. |
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| Keywords: | Lake Chaohu carbon dioxide (CO2) flux chromophoric dissolved organic matter (CDOM) parallel factor analysis (PARAFAC) |
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