Column descriptors for soil 15N file RowID: unique descriptor of data line Exclude: reason for excluding data for some analyses. Includes: Crop (soils are from crops), Depth (collected from on average below 30 cm), Litter (not mineral soils), Low C:N (C:N too low to be considered realistic), low [N] (N concentration too low to be considered realistic), Marine (adjacent to a marine ecosystem), Organic ([C] above threshold for mineral soils). Reference: source of data (see accompanying file) Vegetation Type: descriptor of vegetation type if provided SiteID: contributor provided site identification, if provided Treatment: contributor provided site treatment, if provided Latitude: latitude (in decimal degrees) Longitude: longitude (in decimal degrees) Lat.Round: latitude rounded to nearest 0.1¡ (in decimal degrees) Long.Round: longitude rounded to nearest 0.1¡ (in decimal degrees) Notes: any miscellaneous notes on sample MAT: mean annual temperature (¡C) MAP: mean annual precipitation (mm) Soil Type: soil type, if provided UpperDepth: upper depth of soil sample (cm) LowerDepth: lower depth of soil sample (cm) AverageDepth: average depth of soil sample (cm) 15N: soil ?15N (ä, atmospheric standard) [N]: soil N concentrations (mg g-1) 13C: soil ?15N (ä, PDB standard) [C]: soil C concentrations (mg g-1) C:N: ratio of C and N concentrations (unitless) Sand: percent sand of sample (%) Silt: percent silt of sample (%) Clay: percent clay of sample (%) pH: pH units of soil sample (unitless) pH type: type of extractant used for pH sample