Response of Picea purpurea and Abies faxoniana tree rings at different slope aspects to rapid warming in western Sichuan, China. EFFECTS OF FARGESIA NITIDA ON REGENERATION OF ABIES FAXONIANASEEDLINGS NEAR THE EDGE OF SUBALPINE DARK CONIFEROUS FOREST C, N and P stoichiometric characteristics of different root orders for three dominant tree species in subalpine forests of western Sichuan, China.