Redundancy analysis (RDA) showing the influence of soil properties on the AMF community composition in B. retusum rhizospheres. The first two axes explained 37.1% of the total variance (69.7% for the model). Only soil variables with significant effects in Monte Carlo tests (P < 0.05) are shown in the bi-plot diagram. THS, Typic Haplosalid; XER, Lithic Xerorthent; TOR, Xeric Torriorthent; THA, Typic Haplargid; LHP, Lithic Haploxeroll; THP, Typic Haploxeroll; DHS, dehydrogenase; TCH, total carbohydrates; Ur, urease.