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引用本文:齐天赐,肖启涛,苗雨青,段洪涛.巢湖水体二氧化碳浓度时空分布特征及其水-气交换通量.湖泊科学,2019,31(3):766-778. DOI:10.18307/2019.0315
QI Tianci,XIAO Qitao,MIAO Yuqing,DUAN Hongtao.Temporal and spatial variation of carbon dioxide concentration and its exchange fluxes in Lake Chaohu. J. Lake Sci.2019,31(3):766-778. DOI:10.18307/2019.0315
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巢湖水体二氧化碳浓度时空分布特征及其水-气交换通量
齐天赐1,2, 肖启涛1, 苗雨青3,4, 段洪涛1
1.中国科学院南京地理与湖泊研究所, 中国科学院流域地理学重点实验室, 南京 210008;2.中国科学院大学, 北京 100049;3.安徽师范大学地理与旅游学院 江淮流域地表过程与区域响应安徽省重点实验室, 芜湖 241003;4.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
摘要:
为揭示巢湖水体二氧化碳浓度(cCO2)时空变化特征及其影响因素,2017年2、4、8和11月分别采集巢湖表层水样,测定水样的理化、生物学参数以及cCO2,并以此计算其水-气界面交换通量.结果表明:巢湖表层水体cCO2的变化范围为13.31~55.47 μmol/L,年平均值为26.27 μmol/L,在空间上呈现出西高东低的分布趋势;在季节上表现为暖季(夏季)低、冷季(春、秋和冬季)高的规律.巢湖表层水体cCO2与溶解性有机碳浓度呈显著正相关,与叶绿素a浓度呈显著负相关,说明有机质分解和光合作用在巢湖CO2生物化学循环过程中占重要作用;同时,南淝河等入湖河流污染严重,输入大量有机和无机碳,对西巢湖水体CO2贡献较大.总体上,巢湖CO2排放量相对较低,巢湖部分区域在冷季(2、11月)表现为CO2的汇.本研究对于明晰富营养化湖泊CO2排放特征以及准确估算全球内陆湖泊碳通量等都具有参考价值.
关键词:  巢湖  二氧化碳浓度  二氧化碳扩散通量  时空变化  影响因素
DOI:10.18307/2019.0315
分类号:
基金项目:国家水体污染控制与治理科技重大专项(2017ZX07603-001)、国家自然科学基金项目(41671358)和中国科学院南京地理与湖泊研究所交叉创新团队项目(NIGLAS2016TD01)联合资助.
Temporal and spatial variation of carbon dioxide concentration and its exchange fluxes in Lake Chaohu
QI Tianci,XIAO Qitao,MIAO Yuqing,DUAN Hongtao
1.Key Laboratory of Watershed Geographic Sciences,Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China;2.University of Chinese Academy of Sciences, Beijing 100049, P.R.China;3.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China
Abstract:
In order to understand the temporal and spatial variation of carbon dioxide concentration (cCO2)and its influencing factors in the surface water of Lake Chaohu, the physicochemical parameters, biological parameters, and cCO2 of surface (15-30 cm)water samples collected in February, April, August and November in 2017 from Lake Chaohu, representing different seasons, were measured. The surface water-air flux of CO2 was then calculated based on gradient method as well. The results showed that the cCO2 ranged from 13.31-55.47 μmol/L. The average annual cCO2 was 26.27 μmol/L. The cCO2 was higher in the west lake sub-lake zone than that in the central and east sub-lake zones. The surface water of Lake Chaohu had a lower cCO2 in the warm season (summer) than in cool and cold seasons (spring, autumn and winter). cCO2 was positively correlated with dissolved organic carbon (DOC)concentration and negatively correlated with chlorophyll-a concentration, suggesting that photosynthesis and decomposition of organic matter plays an important role in the biochemical cycle of CO2. Due to the serious pollution of inflowing rivers surrounding Lake Chaohu, DOC input from the watershed supplied substrates for CO2 production. Lake Chaohu was a relatively small source for atmosphere CO2 compared to others studies. Lake Chaohu shifted from a CO2 source to a sink in cold seasons.
Key words:  Lake Chaohu  carbon dioxide concentration  carbon dioxide diffusion flux  spatial-temporal variation  influencing factors
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