| 引用本文: | 谭佳宇,梁妮,周永强,肖启涛,张力伟,马玉东,卜晓彪,闫起发,丁金枝.新疆干旱区典型湖泊的碳排放监测与特征分析.湖泊科学,2024,36(6):1834-1842. DOI:10.18307/2024.0629 |
| Tan Jiayu,Liang Ni,Zhou Yongqiang,Xiao Qitao,Zhang Liwei,Ma Yudong,Bu Xiaobiao,Yan Qifa,Ding Jinzhi.Carbon emissions monitoring and characteristic analysis of typical lakes in arid regions of Xinjiang. J. Lake Sci.2024,36(6):1834-1842. DOI:10.18307/2024.0629 |
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| 新疆干旱区典型湖泊的碳排放监测与特征分析 |
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谭佳宇1,2, 梁妮1, 周永强3, 肖启涛3, 张力伟4, 马玉东5, 卜晓彪6, 闫起发7, 丁金枝2
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1.昆明理工大学环境科学与工程学院, 昆明 650500;2.中国科学院青藏高原研究所, 北京 100101;3.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;4.北京大学城市与环境学院, 北京 100871;5.黄河水利委员会上游水文水资源局, 兰州 730030;6.青海省水文水资源测报中心, 西宁 810001;7.甘肃省酒泉水文站, 嘉峪关 735100
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| 摘要: |
| 湖泊等水体的碳排放是全球碳循环的重要组成部分,但目前对干旱区湖泊的碳排放特征及其影响机制的研究严重不足,从而导致全球湖泊碳排放估算存在极大不确定性。本研究以新疆干旱区三大典型湖泊——乌伦古湖、赛里木湖和博斯腾湖为研究对象,分别于2023年春季和夏季采集气体、水体和沉积物样品,计算各湖泊二氧化碳(CO2)和甲烷(CH4)浓度,并估算了相应的气体扩散通量和冒泡通量,结合水质、气象、沉积物碳氮含量等参数,探讨了新疆干旱区典型湖泊碳排放大小及影响因素。结果表明:3个湖泊均表现为CO2和CH4净排放,平均CO2和CH4通量分别为(26.8±28.5)和(0.39±0.25) mmol/(m2·d)。受碳源和水质等因素综合影响,湖泊的碳排放通量存在季节差异。具体表现为,春季CO2通量((19.1±26.5) mmol/(m2·d))低于夏季((31.9±28.5) mmol/(m2·d)),而春季CH4通量((0.55±0.25) mmol/(m2·d))高于夏季((0.27±0.17) mmol/(m2·d))。在此基础上初步推算,新疆干旱区3个湖泊的CO2和CH4排放总量分别为212.0和4.7 Gg/a。相较于其他气候区,新疆干旱区湖泊碳排放偏低,但考虑到全球干旱区湖泊面积辽阔,碳排放总量不容小觑,需要在全球湖泊碳排放相关研究中予以综合考虑。 |
| 关键词: 湖泊 二氧化碳 甲烷 碳排放 干旱区 |
| DOI：10.18307/2024.0629 |
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| 基金项目:第二次青藏高原综合科学考察研究项目(2022QZKK0101)资助。 |
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| Carbon emissions monitoring and characteristic analysis of typical lakes in arid regions of Xinjiang |
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Tan Jiayu1,2, Liang Ni1, Zhou Yongqiang3, Xiao Qitao3, Zhang Liwei4, Ma Yudong5, Bu Xiaobiao6, Yan Qifa7, Ding Jinzhi2
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1.Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, P. R. China;2.Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, P. R. China;3.Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;4.College of Urban and Environmental Sciences, Peking University, Beijing 100871, P. R. China;5.Bureau of Hydrology and Water Resources of the Upper Reaches of the Yellow River, Lanzhou 730030, P. R. China;6.Hydrology and Water Resources Forecast Center of Qinghai Province, Xining 810001, P. R. China;7.Jiuquan Hydrology Station in Gansu Province, Jiayuguan 735100, P. R. China
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| Abstract: |
| Carbon emissions from lakes are an important part of the global carbon cycle. However, the current research on the characteristics of carbon emissions from lakes in arid areas and their influencing mechanisms is seriously insufficient, which leads to great uncertainty in the estimation of global lake carbon emissions. In this study, three typical lakes in arid region of Xinjiang—Ulungur, Sayram and Bosten Lakes were selected as the research objects. Samples of gas, water and sediments were collected in spring and summer of 2023, respectively. The concentrations of carbon dioxide(CO2) and methane(CH4) in each lake were calculated, and the corresponding diffusive and ebullitive fluxes were estimated. Combined with water quality, meteorology, sediment carbon and nitrogen content and other parameters, the carbon emission size and influencing factors of typical lakes in Xinjiang were discussed. The results showed that all the three lakes were net emissions of CO2 and CH4, with average CO2 and CH4 fluxes of (26.8±28.5) and (0.39±0.25) mmol/(m2·d), respectively. Due to the comprehensive influence of carbon sources and water quality, the carbon emission fluxes of lakes had seasonal differences. The CO2 fluxes in spring ((19.1±26.5) mmol/(m2·d)) was lower than that in summer ((31.9±28.5) mmol/(m2·d)), and the CH4 fluxes in spring ((0.55±0.25) mmol/(m2·d)) was higher than that in summer ((0.27±0.17) mmol/(m2·d)). On this basis, the magnitudes of CO2 and CH4 emissions from the three lakes in the arid region of Xinjiang were 212.0 and 4.7 Gg/a, respectively. Compared with other climate regions, lake carbon emissions in arid areas of Xinjiang were relatively low. However, considering lake areas in global arid regions are big, the magnitude of carbon emissions needs to be comprehensively considered in the research on global lake carbon emissions. |
| Key words: Lake CO2 CH4 carbon emissions arid region |
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