Fig. 4

Principle coordinates analysis (PCoA) of Bray-Curtis dissimilarity between bacterial families present in the heavy and light fractions of rhizosphere and bulk soil ¹³C labelled and ¹²C unlabelled treatments (N = 3 replicate plants per CO₂ treatment). Rhizosphere communities were shown to vary significantly between labelled or unlabelled fractions (Permanova: permutations = 999, R² = 0.59, p < 0.001)