Responses of Fagus engleriana Seedlings to Light and Nutrient Availability The topography heterogeneity of Fagus engleriana-Cyclobalanopsis oxyodon community in Shennongjia region Sprouting and height in a Fagus engeriana population Genomic DNA Extraction and Optimization of RAPD Analytic Conditions of Fagus engleriana History of Disturbance and Regeneration Strategies of Fagus engleriana and Quercus aliena var. acuteserrata Forests in Shennongjia, Hubei Province A PRELIMINARY STUDY ON GAP REGENERATION DYNAMICS IN TAIYANGPIN BEECH (FAGUS ENGLERIANA SEEM)FOREST Species diversity of Fagus engleriana community in Daba Mountains, Sichuan, China