Overall fungal (A) and bacterial (B) communities in the soil samples along a year-gradient of potato monoculture.

Pie charts show the average relative abundance over 18 samples. OTUs were assigned at the 97% identity level, based on which the H_Shannon and S_Chao1 indices were calculated, which are shown by graphs. Phylogenetic lineages of bacteria were assigned by phylum/subphylum and of fungi by order or higher levels. ARA stands for average relative abundance. The “unidentified fungus” is a taxon able to be assigned to kingdom Fungi but unable to any lower taxon.