Carbon concentration and flux data of the Yangtze River main stream

Data and statistical analysis of carbon concentration, flux, budget, and environmental factors in the main stream of the Yangtze River, including relevant data from manuscripts and text S2-4. The data have already been part of (Wang, M., et al., 2025. Determining carbon fate and budgets throughout the Yangtze mainstream’s transportation processes. Fundamental Researc (https://doi.org/10.1016/j.fmre.2025.08.012)).本数据集涵盖长江干流碳浓度、碳通量、碳收支及环境因子的相关数据与统计分析内容，包含手稿及文本S2-4中的关联数据。该数据集相关内容已收录于Wang, M. 等（2025）发表于《基础研究》（Fundamental Research）的论文《明确长江干流输运过程中的碳归宿与碳收支》，DOI链接：https://doi.org/10.1016/j.fmre.2025.08.012。