Gap regeneration of Cathaya argyrophylla forests Cap dynamics and landscape patterns of forest in central subtropical evergreen broad-leaved forest—A case study from Wanmulin Natural Reserve Area in Fujian Province History of Disturbance and Regeneration Strategies of Fagus engleriana and Quercus aliena var. acuteserrata Forests in Shennongjia, Hubei Province Microclimatic Characteristics of Canopy Gaps in Shorea chinensis Forest in Xishuangbanna CHARACTERISTICS OF CANOPY GAP DISTURBANCE IN WOLONG NATURE RESERVE