三峡库区万州段典型干支流水华期CO<sub>2</sub>通量变化

秦宇; 舒钰清; 王雨潇

doi:10.13205/j.hjgc.202302007

三峡库区万州段典型干支流水华期CO₂通量变化

doi: 10.13205/j.hjgc.202302007

重庆交通大学水利水运工程教育部重点实验室, 重庆 400074

基金项目:

国家自然科学基金项目(51609026)

详细信息

作者简介:
秦宇(1981-),女,教授,博士,主要研究方向为水生态治理。qinyu54001@163.com

通讯作者:
秦宇(1981-),女,教授,博士,主要研究方向为水生态治理。qinyu54001@163.com

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出版历程
- 收稿日期: 2021-12-29
- 网络出版日期: 2023-05-25
- 刊出日期: 2023-02-01

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

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

摘要

摘要: 三峡库区的CO₂排放近年来引起了学界的广泛关注,但水华期间的生物化学作用对CO₂产生和汇集的影响研究并不多见。以三峡库区万州段干流、典型支流(澎溪河)为研究对象,分析水华期间生化过程对水体中CO₂产汇的影响。研究表明:干流、支流CO₂浓度和通量与环境因子、生源物质的相关性存在显著空间差异性;支流水体CO₂浓度与水温、pH、DO呈显著负相关,与DOC、DTP呈显著正相关;水气界面CO₂通量与水温存在显著负相关,与DTP、CO₂浓度显著正相关。干流水体CO₂浓度与pH显著负相关,与 DIC、DOC、NH⁺₄-N显著正相关;水气界面CO₂通量与NH⁺₄-N、CO₂浓度显著正相关;高阳、黄石、万州3个点位水气界面CO₂通量与各自表层水体CO₂浓度变化规律基本一致。藻类会在生长过程中固定CO₂,从而促进碳汇。水华过程会造成区域缺氧甚至厌氧,其原因是藻类在水面聚集、堆积、衰亡等一系列过程,使得水中的DO消耗殆尽,为沉积物中微生物提供了分解环境,而沉入沉积物中的有机质部分又为微生物提供了碳源,进而发生矿化作用,生成CO₂等温室气体。
- 三峡库区 /
- 干流 /
- 支流 /
- 氮 /
- 磷 /
- CO₂
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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