Fig. 6: Mechanistic responses of the soil microbiome associated with soil acidification.

Main differentially abundant KO functional categories in KEGG pathway enrichment (a), and key metabolic pathways of sulfur compounds (b). a Texts on the left indicate level 3 KEGG functional categories. b Texts in the solid line box represent genes or enzymes mediating corresponding metabolic process. Texts in the dashed line oval represent metabolites. Red texts in the solid line box indicate down-regulated genes under acidified soil conditions.