文献类型：期刊文献

英文题名：Dual carbon isotopes (δ¹³C and Δ¹⁴C) were used to reveal the main sources and input fluxes of dissolved inorganic carbon in a karst reservoir in winter

作者：Qiu, Zeqiong Wang, Qinlin Liu, Hao Yu, Xia Wu, Qixin An, Yanling Cheng, Peng Zeng, Jie

第一作者：Qiu, Zeqiong

通信作者：Yu, X[1]

机构：[1]Guizhou Inst Technol, Coll Resources & Environm Engn, Boshi Rd, Guiyang 550025, Guizhou, Peoples R China;[2]Guizhou Univ, Coll Resources & Environm Engn, Key Lab Karst Georesources & Environm, Minist Educ, Guiyang 550025, Peoples R China;[3]Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China;[4]Shanxi Key Lab Accelerator Mass Spectrometry Techn, Xian 710061, Peoples R China

第一机构：贵州理工学院资源与环境工程学院

通信机构：corresponding author), Guizhou Inst Technol, Coll Resources & Environm Engn, Boshi Rd, Guiyang 550025, Guizhou, Peoples R China.|贵州理工学院资源与环境工程学院;贵州理工学院;

年份：2024

卷号：262

外文期刊名：ENVIRONMENTAL RESEARCH

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001316384600001)】；

基金：This work was financially supported by the Strategic Pilot Project (Class B) of the Chinese Academy of Sciences (No. XDB4000000) , the Open Fund of State Key Laboratory of Loess and Quaternary Geology (No. SKLLQG2036) , the Guizhou Provincial Science and Technology Support Program (No. QianKeHeJiChu-ZK [2024] YiBan511) , and the Research Initiation Program for High-level Talents of Guizhou Institute of Technology in 2023 (No. 2023GCC082) . We sincerely thank the ed-itors and reviewers for their valuable comments on improving the manuscript.

语种：英文

外文关键词：Dissolved inorganic carbon; Source tracing; Input flux; Dual carbon isotopes; Karst reservoir

摘要：In karst areas, the dissolved inorganic carbon (DIC) concentrations in aquatic systems are typically higher than that in non-karst areas due to intensive carbonate rock weathering. Understanding the sources and input fluxes of DIC in karst reservoirs is crucial for regional carbon cycle studies. This study utilized dual carbon isotopes (delta C-13(DIC) and Delta C-14(DIC)) to estimate the contribution rates and input fluxes of DIC from various sources in Aha Reservoir (AHR), located in southwestern China. Our results indicated that the DIC concentrations (22.33-32.79 mg L-1) and delta C-13(DIC) values (-10.02 parts per thousand to -8.55 parts per thousand) were nearly homogeneous both vertically and laterally in the reservoir (p > 0.05). The Delta C-14(DIC) values (-246.31 parts per thousand to -137.86 parts per thousand) were homogeneous along the vertical profile (p > 0.05), but showed significant horizontal variation (p < 0.05), with values decreasing from -149.57 +/- 10.27 parts per thousand to -232.85 +/- 2.37 parts per thousand at the mouths of the inflowing rivers. We found that the inflowing rivers were the primary DIC sources to AHR, contributing 70% of the total input, while groundwater and atmospheric CO2 contributions were relatively minor, at 18% and 12%, respectively. The Jinzhong River (JZR), influenced by industrial and domestic wastewater discharge, contributed the largest DIC input flux at 2.01 t/(km(2)mon). In contrast, the Youyu River (YYR), influenced by acidic mine drainage, and the Baiyan River (BYR), influenced by agricultural activities, contributed relatively smaller DIC input fluxes of 1.29 t/(km(2)mon) and 1.03 t/(km(2)mon), respectively. This study highlights the significant impact of anthropogenic activities on DIC input in AHR, with industrial and domestic wastewater discharges having a greater influence than agricultural activities and acidic mine wastewater inputs. These findings underscore the critical need to manage and mitigate the impacts of human activities on karst reservoir ecosystems.