Extended Data Fig. 6: Community composition of laboratory soil samples.
NMDS ordination on weighted UniFrac distance of genomic DNA 16S rRNA genes across all experiments (k = 3, stress=0.12, n = 93 soil horizons). The top plot indicates axes 1 and 2; the bottom plot indicates axes 1 and 3. One ordination was performed and is faceted by the three experimental timepoints – 24 hours, 5 weeks, and 6 months (following autoclaving and inoculation with unburned soil). For all communities across the three laboratory experiments, all tested factors (dominant vegetation, soil horizon, pH, burn treatment, and incubation treatment) were significant predictors of community composition in combined models (PERMANOVA, p = 0.001 for all factors). Soil pH provided the most explanatory power (R2 = 0.07) for community composition followed by experimental treatment (R2 = 0.05).
