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Spatiotemporal Distribution of pCO2 and FCO2 in the Mainstream of the Yangtze River and Its Relationship with Environmental Factors
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Wen-xiu SUN1, Wen-qiang WU1, Bao QIAN2, Huai-dong ZHOU1, Jian-nan ZHANG1, Yi-fan ZHANG1, Fei DONG1
Water Resources and Power | 2025, 43(9) : 47 - 51
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Water Resources and Power | 2025, 43(9): 47-51
Spatiotemporal Distribution of pCO2 and FCO2 in the Mainstream of the Yangtze River and Its Relationship with Environmental Factors
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Wen-xiu SUN1, Wen-qiang WU1, Bao QIAN2, Huai-dong ZHOU1, Jian-nan ZHANG1, Yi-fan ZHANG1, Fei DONG1
Affiliations
  • 1.Department of Water Ecology and Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
  • 2.Hydrology Bureau of Changjiang Water Resources Commission, Wuhan 430010, China
Published: 2025-09-25 doi: 10.20040/j.cnki.1000-7709.2025.20242135
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To estimate the spatiotemporal characteristics of CO2 partial pressure (pCO2) and water-air interface CO2 flux (FCO2) along the Yangtze River, this study selected eight monitoring sections along the main channel of the river from upstream to downstream. Based on water quality data from 2020 to 2022, pCO2 and FCO2 were calculated using the CO2 SYS software. The spatiotemporal variations of pCO2 and FCO2 were analyzed, and the relationships between pCO2, FCO2, and environmental factors were assessed using the Mantel test. The results show that from 2020 to 2022, pCO2 in the Yangtze River ranged from 450.02 to 3 615.88 μatm, which was higher than the global atmospheric CO2 average partial pressure of 414.78 μatm during the same period. Spatially, the distribution of pCO2 was as follows: midstream > upstream > estuary. The average values of water-air FCO2 during 2020-2022 were 40.25 mol/(m2·a), 74.74 mol/(m2·a), and 61.85 mol/(m2·a), respectively, with a spatial distribution of upstream > midstream > estuary. The Yangtze River is in a state of CO2 oversaturation, and that the water-air FCO2 flux showed an overall increasing trend from 2020 to 2022. pCO2 exhibited a significant positive correlation with water temperature, dissolved oxygen, and pH, while FCO2 was positively correlated with pH, dissolved oxygen, and conductivity.

Yangtze River  /  pCO2  /  FCO2  /  spatiotemporal characteristics  /  correlation
Wen-xiu SUN, Wen-qiang WU, Bao QIAN, Huai-dong ZHOU, Jian-nan ZHANG, Yi-fan ZHANG, Fei DONG. Spatiotemporal Distribution of pCO2 and FCO2 in the Mainstream of the Yangtze River and Its Relationship with Environmental Factors[J]. Water Resources and Power, 2025 , 43 (9) : 47 -51 . DOI: 10.20040/j.cnki.1000-7709.2025.20242135
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Year 2025 volume 43 Issue 9
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Article Info
doi: 10.20040/j.cnki.1000-7709.2025.20242135
  • Receive Date：2024-11-14
  • Online Date：2025-12-16
  • Published：2025-09-25
Article Data
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History
  • Received：2024-11-14
  • Revised：2024-12-16
Funding
Affiliations
    1.Department of Water Ecology and Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    2.Hydrology Bureau of Changjiang Water Resources Commission, Wuhan 430010, China
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表12种不同金属材料的力学参数
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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