The Response of Carbonate System to Watershed Urbanization Process in a Semi-Arid River

文献类型： 外文期刊

第一作者： Li, Yunxiao

作者： Li, Yunxiao;Dang, Jiajia;Li, Lina;Huang, Xiao;Yang, Hong;Wang, Xiao;Bai, Jie;Chen, Xi

作者机构：

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.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序