Figure 4.

Beta diversity analysis. (A) Principal component analysis (PCA). Two principal components (PC1 and PC2) of PCA are shown in the coordinates. The same color points belonged to the same soil group are closer to each other and the samples from different soil groups are farther apart. (B) Unweighted pair-group method with arithmetic mean (UPGMA) analysis is clustered according to samples’ similarity. The longer the branch length between samples, the more variable the two samples are. (C) Analysis of similarities (ANOSIM) revealed the variation in the composition (Bray–Jaccard distance) of spermosphere or bulk soil bacterial communities.