Soil organic carbon and soil organic matter measurements across European habitats, including permafrost regions and global seagrass sediments

A collation of datasets and derived carbon metrics is provided for soil samples with data on total soil carbon, soil organic carbon (SOC) and soil organic matter (SOM) for soil samples from Europe, permafrost regions and global seagrass sediments. Soils were sampled to different depths. SOC and SOM were used to calculate derived parameters such as foc (the fraction of SOC in SOM) and SOM content was used to define mineral (<20% SOM) and organic (>20% SOM) soils. The provided dataset was used to explore foc as a national-scale soil process indicator.