Sources, Sinks, and Isotopic Fractionation of Antimony in a Karst Catchment: Constraints on Multi-media Migration and Biogeochemical Cycling

This study aims to explore sources, sinks, and isotopic fractionation of antimony in a karst catchment.We monitored the input and output fluxes of antimony within the catchment, and conducted analysis and testing on the major trace elements and antimony isotope composition of the forest and farmland profiles. We also tested the antimony content and its isotope composition in different water bodies within the forest area.This study clarified the source-sink relationship of Sb in the karst catchment by monitoring the input flux and output flux of Sb. Combined with Sb isotope tracing technology and other geochemical methods, the Sb sources in rainfall and atmospheric particles were identified, the migration and controlling factors of Sb in forest and farmland soil profiles were analyzed in depth, and the redistribution effects of the canopy and litter layers within the forest ecosystem on Sb in rainfall were discussed.Research findings provide important scientific insights into the geochemical cycling of Sb at the catchment scale in karst regions, meanwhile demonstrating the significant advantages of Sb stable isotopes in tracing material sources and processes within complex environments.本研究旨在探究喀斯特流域内锑（antimony）的来源、归趋与同位素分馏效应。本研究对流域内锑的输入与输出通量进行了监测，并针对森林与农田剖面的主要微量元素及锑同位素组成开展了分析测试工作；此外，还测定了林区内不同水体中的锑含量及其同位素组成。本研究通过监测锑的输入与输出通量，明确了喀斯特流域内锑的源汇关系。结合锑同位素示踪技术与其他地球化学方法，本研究识别了降雨及大气颗粒物中的锑来源，深入剖析了锑在森林与农田土壤剖面中的迁移过程及其控制因素，并探讨了森林生态系统内冠层与枯落物层对降雨中锑的再分配效应。本研究成果可为喀斯特流域尺度下锑的地球化学循环研究提供重要科学参考，同时彰显了锑稳定同位素在复杂环境中示踪物质来源与迁移过程的显著优势。