Table 1.

Principal components analysis of soil and topographic variables. (a) Importance of PCs, (b) PCA loadings

(a)
	PC1	PC2	PC3	PC4	PC5
Standard deviation	2.18	1.56	1.27	1.19	1.10
% variance	33.9	17.4	11.5	10.1	8.6
Cumulative %	33.9	51.3	62.8	72.9	81.5

(b)
	Elevation	Slope	Curvature	TWI	Insolation	Mn	Cu	Zn	Fe	B	P	pH	Al	TEB
PC1	−0.37	−0.16	−0.16	0.26	−0.09	−0.39	−0.39	−0.38	−0.14	−0.37	−0.02	−0.09	−0.02	−0.35
PC2	0.03	−0.15	0.14	−0.15	0.10	−0.29	−0.24	0.19	0.36	0.07	0.49	0.30	−0.52	−0.06
PC3	−0.21	0.57	−0.28	0.08	−0.64	0.01	−0.03	−0.02	0.05	0.08	0.22	0.14	−0.09	0.20
PC4	0.10	−0.22	−0.59	0.56	0.17	0.04	0.09	0.20	0.33	0.08	0.21	−0.18	0.11	0.08
PC5	−0.16	−0.24	−0.22	0.20	0.14	0.08	0.04	−0.10	−0.48	0.28	−0.13	0.62	−0.21	0.20

TWI, topographic wetness index; TEB, total exchangeable bases; PCA, principal component analysis.

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