FIG 4.

Redundancy analysis of the phoD bacterial community of samples S1 to S6 amplified by PHOD primers with the environmental variables clay and silt content, total C and P, soil type, climate, vegetation and soil pH. The significance of the model is indicated in the bottom right corner. Note that soil pH was the unique environmental variable that was significantly correlated with the phoD bacterial community (P = 0.03).