A multi-source dissolved carbon dataset for China's inland waters over the past three decades: concentration, storage, and flux.

Kruskal-Wallis Test results showed that DC parameters exhibited highly significant statistical differences across different periods ( P < 0.001, Table S3 ), confirming the temporal heterogeneity of DC concentrations; further analysis indicated that such differences were mainly driven by the uneven spatial distribution of sampling (Table S4 , Fig.

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Additionally, the uncertainty of fluvial DC fluxes showed a decreasing trend with increasing Strahler stream order (1–9, from headwater streams to tributaries and mainstream rivers) (Fig.

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