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

机构：[1] College of Resources and Environmental Engineering, Guizhou Institute of Technology, Guiyang, 550025, China; [2] Key Laboratory of Karst Georesources and Environment [Guizhou University], Ministry of Education, College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China; [3] State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS, Xi'an, 710061, China; [4] Shanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi'an, 710061, China

第一机构：贵州理工学院资源与环境工程学院

年份：2024

卷号：262

外文期刊名：Environmental Research

收录：EI(收录号：20240269591);Scopus(收录号：2-s2.0-85203639244)

语种：英文

外文关键词：Catchments - Fertilizers

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 (δ13CDIC and Δ14CDIC) 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 δ13CDIC values (?10.02‰ to ?8.55‰) were nearly homogeneous both vertically and laterally in the reservoir (p > 0.05). The Δ14CDIC values (?246.31‰ to ?137.86‰) were homogeneous along the vertical profile (p > 0.05), but showed significant horizontal variation (p 2 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/(km2·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/(km2·mon) and 1.03 t/(km2·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. ? 2024 Elsevier Inc.