Fig. 4

Analysis of positive/negative interactions in co-occurrence networks. The figure shows the parameters of the networks (number of nodes, number of edges and ratio between positive and negative interactions) in the upper panel and the bar plots of the analysis of the number of positive and negative interactions between nodes belonging to different abundance categories (abundant-abundant, abundant-rare and rare-rare) in the bottom panel, for the non-supplemented and iron-supplemented networks of rhizosphere networks in A) and bulk soil networks in B)