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

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外文摘要：Different from rivers in humid areas,the variability of riverine CO2 system in arid areas is heavily impacted by anthro-pogenic 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(pCO2)(about 800 μatm).In comparison,damming resulted in the widespread appearance of non-free flowing river segments,and aquatic photosynthesis dominated the DIC and pCO2 spatiality demonstrated by the enriched stable isotope of DIC(δ13CDIC).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 pCO2(>4500 μatm)in the downstream of Taiyuan City,and in cold November the increased DIC even extended to the outlet of the river.Our re-sults 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.

外文关键词：

dissolved inorganic carbonstable carbon isotopecarbonate weatheringaquatic photosynthesissewage inputthe Fenhe River

作者：

LI Yunxiao、DANG Jiajia、HUANG Xiao、YANG Hong、WANG Xiao、LI Lina、BAI Jie、CHEN Xi

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作者单位：

Department of Environmental Science,College of Resource and Environment,Shanxi Agricultural University,Taigu 030801,China

Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control,Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,School of Environmental Science and Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China

Department of Geography and Environmental Science,University of Reading,Whiteknights,Reading RG6 6AB,UK

Marine Agriculture Research Center,Tobacco Research Institute,Chinese Academy of Agricultural Sciences,Qingdao 266101,China

Key Laboratory of Marine Environmental Science and Ecology,Ministry of Education,College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China

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基金：

National Natural Science Foundation of China(NSFC)Youth Project of Shanxi Basic ResearchYouth Project of Shanxi Basic ResearchResearch and Promotion Project of Water Conservancy Science and Technology in Shanxi Provincescience and Technology Innovation Fund of Shanxi Agricultural UniversityShanxi Agricultural University

项目编号：

413761232021 0302124317201901D2113832023GM412018YJ21

出版年：

2024

DOI：

10.1007/s11802-024-5674-1

中国海洋大学学报(自然科学英文版)

中国海洋大学

中国海洋大学学报(自然科学英文版)

CSTPCD

影响因子：0.268

ISSN：1672-5182

年,卷(期)：2024.23(4)