【摘要】 河流是天然无机碳循环的重要通道。溶解无机碳（DIC）约占据河流碳通量的50%,近几十年来，分析DIC浓度及其稳定碳同位素特征已成为示踪碳来源、追踪碳循环、指示碳动态变化的有效方法和重要技术指标。介绍了DIC稳定碳同位素的测定方法，比较了不同的前处理方法，提出了稳定碳同位素的分析方法，总结了河流DIC浓度及其稳定碳同位素的组成特征，分析了影响河流DIC浓度及δ¹³C_DIC的重要因素，包括岩石风化作用、季节效应、土地利用类型、水生光合作用与脱气作用和人类活动。在此基础上，提出了稳定碳同位素技术的应用前景，对稳定碳同位素技术存在的问题进行了分析和展望，可为我国DIC的碳循环过程以及河水补给端元的确定提供理论依据。更多还原

【Abstract】 Rivers are an important channel for natural inorganic carbon cycling.Dissolved inorganic carbon（DIC） occupies about 50% of river carbon fluxes.In recent years, the analysis of DIC concentration and stable carbon isotope characteristics has become an effective method and an important technical indicator for tracing carbon sources, tracking carbon cycle and revealing carbon dynamic changes.This paper introduces the method of stable carbon isotopes in DIC determination, compares different pretreatment methods, proposes the analysis method of stable carbon isotopes, summarizes the characteristics of river DIC concentration and stable carbon isotope composition values, and analyzes the important factors affecting river DIC concentration and δ¹³C_DIC including chemical weathering of rocks, seasonal effects, land use type, aquatic photosynthesis and degassing and human activities.On this basis, the paper puts forward some application prospect of stable carbon isotope techniques, and analyzes and prospects the problems of stable carbon isotope technology, providing a theoretical basis for the carbon cycle process of dissolved inorganic carbon and the determination of river water recharge end elements in China.更多还原