Fig. 2

Relative abundance of the 16 most abundant phyla from each soil sample collected from systems under drought stress or the presence of plants. The data points represent the abundance of each phylum relative to the total of all phyla in each sample. The 16 most abundant phyla in each treatment are integrated and identified, as well as an unassigned phylum. Only Proteobacteria is subdivided into classes. Clusters of other phyla are labeled as “Others.” Grids are set according to the application of stress (drought (+)/watered (−)) and the presence of plants (with (+)/without (−)). Detailed information on each sample is presented in Table 1