Table 2. PCA loadings for correlations of root traits with PC1 and PC2.

Trait name	Abbreviation	PC1	PC2
Sulfur	Sroot	0.838	0.180
Nitrogen	Nroot	0.821	0.326
Carbon	Croot	0.786	0.551
Manganese	Mnroot	0.579	0.670
AM root colonization	AMR	0.275	0.709
Phosphorus	Proot	0.306	0.571
AM vesicles	AMves	-0.045	0.773
Iron	Feroot	-0.634	0.665
Dead root tips	DeadR	-0.592	-0.381
Aluminium	Alroot	-0.817	0.414
AM spores in soil	AMspore	-0.866	0.200