文献类型： 外文期刊
作者： Li, Yunxiao 1 ; Dang, Jiajia 1 ; Huang, Xiao 2 ; Yang, Hong 3 ; Wang, Xiao 4 ; Li, Lina 1 ; Bai, Jie 5 ; Chen, Xi 5 ;
作者机构： 1.Shanxi Agr Univ, Coll Resource & Environm, Dept Environm Sci, Taigu 030801, Peoples R China
2.Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Atmospher Environm & Equipm, Sch Environm Sci & Engn, Jiangsu Key Lab Atmospher Environm Monitoring & Po, Nanjing 210044, Peoples R China
3.Univ Reading, Dept Geog & Environm Sci, Reading RG6 6AB, England
4.Chinese Acad Agr Sci, Tobacco Res Inst, Marine Agr Res Ctr, Qingdao 266101, Peoples R China
5.Ocean Univ China, Coll Environm Sci & Engn, Key Lab Marine Environm Sci & Ecol, Minist Educ, Qingdao 266100, Peoples R China
关键词： dissolved inorganic carbon; stable carbon isotope; carbonate weathering; aquatic photosynthesis; sewage input; the Fenhe River
期刊名称：JOURNAL OF OCEAN UNIVERSITY OF CHINA （ 影响因子：1.4； 五年影响因子：1.4 ）
ISSN： 1672-5182
年卷期： 2024 年 23 卷 4 期
页码：
收录情况： SCI
摘要： Different from rivers in humid areas, the variability of riverine CO2 system in arid areas is heavily impacted by anthropogenic disturbance with the increasing urbanization and water withdrawals. In this study, the water chemistry and the controls of carbonate system in an urbanized river (the Fenhe River) on the semi-arid Loess Plateau were analyzed. The water chemistry of the river water showed that the high dissolved inorganic carbon (DIC) concentration (about 37 mg L-1) in the upstream with a karst land type was mainly sourced from carbonate weathering involved by H2CO3 and H2SO4, resulting in an oversaturated partial pressure of CO2 (pCO(2)) (about 800 mu atm). In comparison, damming resulted in the widespread appearance of non-free flowing river segments, and aquatic photosynthesis dominated the DIC and pCO(2) spatiality demonstrated by the enriched stable isotope of DIC (delta C-13(DIC)). Especially in the mid-downstream flowing through major cities in warm and low-runoff August, some river segments even acted as an atmospheric CO2 sink. The noteworthy is wastewater input leading to a sudden increase in DIC (> 55 mg L-1) and pCO(2) (> 4500 mu atm) in the downstream of Taiyuan City, and in cold November the increased DIC even extended to the outlet of the river. Our results highlight the effects of aquatic production induced by damming and urban sewage input on riverine CO2 system in semi-arid areas, and reducing sewage discharge may mitigate CO2 emission from the rivers.
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