Fig. 3: Pyrogenic dissolved organic matter becomes increasingly aromatic with wildfire burn severity.
From: Wildfire-dependent changes in soil microbiome diversity and function
a, Van Krevelen diagram showing unique formulas in unburned, low, and moderate and high (combined) surface soils. b, Aromaticity index of DOM pools extracted from surface soils across the burn severity gradient (n = 4 for control, 6 for low, 5 for moderate and 6 for high severity). Corresponding P values are shown in Supplementary Fig. 4b from one-sided pairwise t-test. The lower and upper hinges of the boxplot represent the 25th and 75th percentiles, respectively, and the middle line is the median. The whiskers extend from the median by 1.5× the interquartile range. Data points represent outliers. Coloured asterisks indicate significant difference between the two conditions (pairwise t-test, P < 0.05). c, Density plot of unique formula NOSC value distributions between different conditions. Dashed line shows NOSC median for each condition.
