This data is used in the publication "Mineral soils are an important intermediate storage pool of black carbon in boreal forests". The column plot_id uniquely represents each sample plot in the study and matches the columns of the same name in the complementary dataset "Dataset for 'Climatic Variation Drives Loss and Restructuring of Carbon and Nitrogen in Boreal Forest Wildfire'". Odd numbers are burnt plots, while the burnt plot_id plus 1 is its paired control. Columns are labeled with the name of sampled soil layer and entries are their associated BC:W values. BC:W is unitless (formed by dividing grams black carbon by grams sample weight). Empty spots mean there was no material at the plot to collect.