VARIATION CHARACTERISTICS OF CO<sub>2</sub> FLUXES IN THE MAIN STREAM AND TYPICAL TRIBUTARIES OF WANZHOU SECTION OF THE THREE GORGES RESERVOIR

QIN Yu; SHU Yuqing; WANG Yuxiao

doi:10.13205/j.hjgc.202302007

Volume 41 Issue 2

Feb. 2023

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QIN Yu, SHU Yuqing, WANG Yuxiao. VARIATION CHARACTERISTICS OF CO2 FLUXES IN THE MAIN STREAM AND TYPICAL TRIBUTARIES OF WANZHOU SECTION OF THE THREE GORGES RESERVOIR[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(2): 43-52. doi: 10.13205/j.hjgc.202302007

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QIN Yu, SHU Yuqing, WANG Yuxiao. VARIATION CHARACTERISTICS OF CO₂ FLUXES IN THE MAIN STREAM AND TYPICAL TRIBUTARIES OF WANZHOU SECTION OF THE THREE GORGES RESERVOIR[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(2): 43-52. doi: 10.13205/j.hjgc.202302007

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VARIATION CHARACTERISTICS OF CO₂ FLUXES IN THE MAIN STREAM AND TYPICAL TRIBUTARIES OF WANZHOU SECTION OF THE THREE GORGES RESERVOIR

doi: 10.13205/j.hjgc.202302007

Ministry of Education Key Laboratory of Water Conservancy and Water Transportation Engineering, Chongqing Jiaotong University, Chongqing 400074, China

Received Date: 2021-12-29
Available Online: 2023-05-25
Publish Date: 2023-02-01

Abstract

Abstract

The emission of greenhouse gases in the Three Gorges Reservoir area has attracted much attention in recent years, but the current research lacks the analysis of the impact of biochemical processes during algal blooms on CO₂ production and sinks in water body. So this research took the mainstream, Wanzhou Section of Three Gorges Reservoir, and a typical tributary, Pengxi River as the objects to carry out an investigation. The result showed that there were significant spatial differences in the correlation between the main stream and tributary CO₂ concentration and flux, environmental factors and biogenic substances.The concentration of CO₂ in tributary water was significantly negatively correlated with water temperature, pH and DO, and significantly positively correlated with DOC and DTP. There was a significant negative correlation between CO₂ flux at the water-air interface and water temperature, and a significant positive correlation with DTP and CO₂ concentration. The concentration of CO₂ in the main stream water was negatively correlated with pH, and positively correlated with DIC, DOC, NH⁺₄-N. The CO₂ flux at the water-air interface was significantly positively correlated with the concentrations of NH⁺₄-N and CO₂. The changes of CO₂ fluxes at the water-air interface at Gaoyang, Huangshi, and Wanzhou were basically consistent with the changes of CO₂ concentrations in their respective surface waters. Algae fixes CO₂ as they grow, boosting carbon sinks. The process of algal bloom will cause regional hypoxia or even anaerobicity. The reason was that algae accumulate, accumulate, and die on the water surface, which consumed the dissolved oxygen in the water and provided a decomposition environment for microorganisms in the sediment. The organic matter that sank into the sediments provided a carbon source for microorganisms, and then mineralization occursed to generate greenhouse gases such as CO₂.
- Three Gorges Reservoir Area,
- main stream,
- tributary,
- nitrogen,
- phosphorus,
- CO₂

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References(37)

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