Data and R code for: Radiocarbon evidence that tree mycorrhizal type modulates mean soil carbon age across depths but not organic matter fractions

For each bulk soil sample: pH and 14-day C mineralisation. For each plot: tree basal area and the share of AM and EcM trees. For each subplot: soil moisture and C-stock-weighted whole-profile Δ14C.

The data also include summary statistics of radiocarbon analytical uncertainty, standards and blanks. data_dictionary.csv defines every column, with units and derivations. </p><p dir="ltr">run_all.R runs the full workflow in about 1 minute and writes every table, figure, fitted model and log to output/. It reproduces data-based figures and tables in the paper and its supplementary information, which comes from a tree survey not included here.

The deposited output/ was produced with R 4.4.1, and the workflow was also checked with R 4.3.3. README.md describes the sampling design, models, file layout and how to check a run. We used the large language model Claude to assist with code workflow editing during revisions; all code, analyses, and outputs were reviewed by the authors.</p>