Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS), chemistry, and radiocarbon data of topsoil and subsoil dissolved organic matter (DOM) incubated with an inoculum from surface water.

Processed and quality checked FT-ICR MS data for original aqueous extracts for a topsoil and a subsoil, the stream water inoculum and all experimental samples analyzed with DI-ESI-FT-ICR MS (data underlying figures 4). The complete molecular formula assignments ("BOR23_formulas.smp23_2024-03-13.csv") and aggregated values ("BOR23_eval.summary.smp23_2024-03-13.csv") as well as a definition file are provided (""Repository_file_definition_2022_09_05.csv).
Sampling and measurement conditions are described in the companion paper (Tittel, J.; Lechtenfeld, O. J., INVARIABLE SELECTION OF COMPOUNDS FROM ORGANIC MATTER BY STREAM MICROBES. Geochimica et Cosmochimica Acta, 2024, DOI: https://doi.org/10.1016/j.gca.2024.12.003).
The data set also contains supplementary information for figure 1, 2, 3, and 5 as txt file ("Data supporting Figures 1, 2, 3, and 5.txt"):

- Table S1: Location and catchment area of sampled headwater streams.

- Table S2: Chemistry of streams sampled for DOC decomposition experiments including the data underlying Figure 1.

- Table S3: Isotope data from stream DOC decomposition experiments underlying Figure 2.

- Table S4: Data from soil leachate decomposition experiments underlying Figure 3.

- Table S5: Published ∆14C data from decomposition experiments, underlying Figure 5.