Fig. 5

The linkage between aquifer microbial communities and environmental factors. A Variance partition analysis (VPA) showing relative contributions of geographical distance (Geo.) and environmental variables (Env.) to the different diversity indexes based on the PLS method. B Variable influence on projection (VIP) values based on the PLS model for different diversity indexes, where VIP value larger than 1 is filled, VIP value smaller than 1 is blank