Fig. 5

Analysis of metabolomics profiles in the rhizosphere soil of A. mongholicus planted under continuous cropping (Field II) and non-continuous cropping (Field I). A PCA plot of the metabolite profiles in rhizosphere soils from Field I and Field II obtained via GC–MS. The Adonis test had a p-value = 0.003). B The top 10 (top 4% of 236 total compounds) compounds sorted by their respective loading variable importance (in descending order) from the PCA of the two rhizosphere soil data sets. C The top 35 marker compounds were identified through a random forest classification of their relative abundances in the rhizosphere soil metabolomics profiles of A. mongholicus grown in Field I and Field II. The marker compounds are ranked in descending order of importance with respect to the accuracy of the model