Principal component analysis (PCA) and correlation analysis (CA) were applied to analyze the correlation of the main chemical components in Astragalus membranaceus var. 
PCA
[Correlation between chemical constituents and ecological factors of Astragalus membranaceus var. mongholicus]. Principal component analysis (PCA) and correlation analysis (CA) were applied to analyze the correlation of the main chemical components in Astragalus membranaceus var.  mongholicus and ecological factors.  The results showed that the contents of astragaloside, campanulin, ononin, kaempferol and astragalus polysaccharides (APS) of A. membranaceus var.  in Shanxi were significantly higher than in Inner Mongolia and Gansu.  The main climatic factors for affecting the contents of chemical ingredients in A. membranaceus var.  Calcium was the main factor in the soil affecting the chemical ingredient contents, and calcium was negatively correlated with the contents of calycosin glycosides, kaempferol, ononin, quercetin and APS in A. membranaceus var. 
CA