Fig. 1

– Relative abundances of the major microbial taxa assigned by metabarcoding for the different locations and compositions. The relative abundances of the major fungal (A) and bacterial (B) taxa assigned are represented according to the different sample conditions: i) earthen materials without vegetal aggregates (E-D); ii) earthen materials with vegetal aggregates (V-D); iii) earthen materials without vegetal aggregates (E-ND); iv) earthen materials with vegetal aggregates (V-ND). The following taxa were significantly different among the four sampling conditions (Kruskal-Wallis p-value < 0.05): i) fungi – Acremonium, Alternaria, Aspergillus, Cladosporium, Cryptococcus, Libertasomyces, Penicillium, Phialosimplex, Verticillium, Wallemia; ii) bacteria – Acinetobacter, Actinomycetospora, Arthrobacter, Exiguobacterium, Fictibacillus, Nocardioides, Saccharopolyspora, Sphingomonas, Trichococcus. The following taxa were not significantly different among the four sampling conditions (Kruskal-Wallis p-value > 0.05): i) fungi – Coccodinium, Devriesia, Fusarium; ii) bacteria – Bacillus, Paenibacillus, Pseudonocardia, Rubrobacter.