Fig 3 Relationship between plant species richness per site and plant-bacteria network features (a, c& d ) or the ratio of bacterial richness to plant richness(b ) in each site (vertical axis). (a ) there is no significant trend between plant richness and number of bacterial OTUs linked to each plant species(P >0.05). (b ) All OTUs detected in soil are included, not only those linked to plant species. (P =< 0.001)