2026-10-06T07:27:06Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34059549 2026-10-03T14:26:27Z category_24235 item_type_3 month_year_10_2026

Data and R code for: Radiocarbon evidence that tree mycorrhizal type modulates mean soil carbon age across depths but not organic matter fractions Shangshi Liu (20738486) Mark A. Bradford (22600664) Jonathan Sanderman (9246605) Peter Raymond (4732035) Elisabeth Ward (25303576) Terrestrial ecology arbuscular mycorrhizal fungi ectomycorrhizal fungi mineral-associated organic matter particulate organic matter radiocarbon soil carbon persistence temperate forests <p dir="ltr">This record contains the data and R code for the paper "Radiocarbon evidence that tree mycorrhizal type modulates mean soil carbon age across depths but not organic matter fractions".</p><p dir="ltr">Soils were sampled in June 2021 in Yale-Myers Forest, Connecticut, USA. Each of three stands contained one arbuscular mycorrhizal (AM)-dominated plot and one ectomycorrhizal (EcM)-dominated plot. Each plot contained two subplots, one with and one without the ericoid mycorrhizal shrub. In each subplot, three horizons were sampled: the Oa; the surface mineral horizon, 0–10 cm below the Oa; and the subsurface mineral horizon, to 30 cm cumulative depth including the Oa. Each sample was separated into particulate (POM, >53 µm) and mineral-associated (MAOM, <53 µm) organic matter. This gives 72 fraction-level observations from 36 soil samples.</p><p dir="ltr">For each fraction: Δ14C, δ13C, δ15N, C and N concentrations (within the fraction and on a whole-soil basis), and C:N ratio. 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. 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> 2026-10-03T14:26:27Z Dataset Dataset 10.6084/m9.figshare.34059549.v2 https://figshare.com/articles/dataset/Data_and_R_code_for_Radiocarbon_evidence_that_tree_mycorrhizal_type_modulates_mean_soil_carbon_age_across_depths_but_not_organic_matter_fractions/34059549 CC BY 4.0