Fig 4.

Effect of sawdust amendment on fungal community composition in an arable soil, as determined for unplanted soil (So), carrot rhizosphere (Rhi), ¹³C‐enriched DNA fraction in the carrot rhizosphere (RhiA) and carrot root (Ro). Relative abundance of fungal classes (A) and fungal functional groups (B) are displayed for soil, rhizosphere and root compartments and for each pre‐sowing incubation time (T1 = 2 weeks, T2 = 6 weeks) in sawdust‐amended pots and controls. Fungal taxa and functional groups of relative abundance <1.5% were classified as ‘Other’. (C, D): relative abundance of the functional fungal groups ‘saprotrophs’ and those potentially containing ‘plant pathogens’. The main effect of sawdust amendment is shown alongside the effect of sawdust in each compartment (three‐way ANOVA with planned contrasts, *** P < 0.001, ** P < 0.01, * P < 0.05).