Table 5.

Results of PCA analysis of environmental factors of C. paliurus.

	Extract coefficient	PCA1	PCA2
Latitude	0.83	0.34	−0.85
Longitude	0.95	0.93	0.28
Altitude	0.58	−0.67	−0.35
Annual mean temperature	0.70	−0.62	0.56
Annual precipitation	0.80	0.72	0.54
Annual sunlight	0.50	0.69	0.15
Annual frost-free days	0.90	−0.86	0.41
Total variance of interpretation (%)		44.95	30.00