Taking one-year seedling of Castanopsis tibetana from different geographical provenances of Jian' ou in Fujian, Enshi in Hubei, Liuyang in Hunan, Sengzhi in Hunan, Yongshun in Hunan as materials. Seedling height, seedling diameter and monolithic leaf area and other growth indicators were measured. meanwhile taking leaf of Castanopsis tibetana seedling as material, net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), intercellular CO2 concentration (Ci), chlorophyll total content (Ct),the ratio of chloroph...