Figure 6.-Principal coordinates analysis of predictor variables and fitted as trend surfaces aposteriori by generalized additive model in Xiapu County.
(A) 300 m, P. massoniana ; (B) 800 m, P. massoniana ; (C) 800 m, Mixed forest; (D) 800 m, P. elliottii ; (E) 1,000 m,P. massoniana ; (F) 1,000 m, Mixed forest; (G) 1,000 m, Farmland; (H) 1,000 m, Road: (I) 1,000 m, Urban.