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| 典型农业流域不同类型池塘水体CO2排放特征 |
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陈嘉宁1, 肖启涛2, 刘臻婧3, 肖薇4, 谢晖5, 罗菊花5, 邱银国5, 胡正华4, 段洪涛5
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1.南京信息工程大学气象灾害预报预警与评估协同创新中心，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;2.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;3.湖南省气候中心;4.南京信息工程大学气象灾害预报预警与评估协同创新中心;5.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
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| 摘要: |
| 内陆水体是大气CO2收支估算的重要组成部分。农业流域分布着大量池塘景观水体，且具备蓄洪抗旱、消纳污染、水产养殖等多种功能。但是，农业流域不同功能的小型池塘CO2排放特征尚不清楚。本研究以极具农业流域代表性的烔炀河流域为研究对象，选取流域中用于水产养殖（养殖塘）、生活污水承纳（村塘）、农业灌溉（农塘）、蓄水（水塘）的四个功能不同的景观池塘，基于为期一年的野外实地观测，以明确农业流域小型池塘CO2排放特征。结果表明，不同功能池塘水体CO2排放差异显著，受养殖活动、生活污水输入和农田灌溉等人类活动影响，养殖塘（80.37±100.39 mmol·m-2·d-1）、村塘（48.69±65.89 mmol·m-2·d-1）和农塘（13.50±15.81 mmol·m-2·d-1）是大气CO2的热点排放源，其CO2排放通量分别是自然蓄水塘（4.52±23.26 mmol·m-2·d-1）的18倍、11倍和3倍。统计分析也表明，该流域池塘CO2排放变化总体上受溶解氧、营养盐等因素驱动。四个不同景观池塘CO2排放通量全年均值为37.31±67.47 mmol·m-2·d-1，是不容忽视的CO2排放源，其中养殖塘和村塘具有较高的CO2排放潜力，在未来研究中需要重点关注。 |
| 关键词: 农业流域 池塘 CO2通量 影响因子 |
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| 基金项目:国家自然科学(42271114)；江苏省碳达峰碳中和科技创新专项资金项目(BK20220018)；江苏省基础研究计划自然科学基金杰出青年(BK20220055) |
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| Variability of CO2 emission from different types of ponds in a typical agricultural watershed |
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Chen Jianing,Xiao Qitao,Liu Zhenjing,Xiao Wei,Xie Hui,Luo Juhua,Qiu Yinguo,Hu Zhenghua,Duan Hongtao
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1.Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology，Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences;2.Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences;3.Hunan Climate Center;4.Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology
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| Abstract: |
| nland waters played significant role in atmospheric CO2 budget estimation. Ponds receive more external loadings per unit area due to shallow in water depth and small in size, likely leading to their hot emission sources of atmospheric CO2. A large number of pond landscape water bodies are distributed in agricultural watershed, and they have many functions, such as flood storage and drought resistance, pollution removal and aquaculture. However, the CO2 emission characteristics of small ponds with different functions in agricultural basins are still unclear. In this study, the Tongyang River basin, which is a representative agricultural basin, is used as the research object. Four landscape ponds with different functions, which are used for aquaculture (aquaculture pond), domestic sewage collection (village pond), agricultural irrigation (agricultural pond) and water storage (storage pond), were selected to survey the CO2 emissions based on one-year field observation from September 2020 to September 2021.Results showed that there were significant differences in CO2 emissions from different ponds. Under the influence of human activities such as aquaculture activities, domestic sewage input and farmland irrigation, aquaculture ponds, sewage ponds and agricultural ponds were the hot spots of atmospheric CO2 emission. The CO2 emission fluxes were 18 times, 11 times and 3 times that of storage pond (4.52±23.26 mmol·m-2·d-1), respectively. Statistical analysis showed that the variation of CO2 emission was mainly driven by dissolved oxygen and nutrients. The annual average CO2 emission fluxes is 37.31±67.47 mmol·m-2·d-1, which acted as significant CO2 emission source. Large CO2 emissions occurred in aquaculture pond and village pond, which should be paid more attention in the future. |
| Key words: Agriculture watershed pond CO2 flux influencing factors |
