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)).