This dataset contains 13C and 15N data for organic soil profiles (organic horizons to top of E horizon) at two of the MOORCO experimental tree planting sites in North East Scotland (Glensaugh and Ballogie). Data also includes total soil carbon and nitrogen stocks and bulk density. Full details about this dataset can be found at https://doi.org/10.5285/00acbdb2-1eba-4016-9e50-e3126933a541