Analysis of the Life Table of Endangered Population Abies yuanbaoshanensis Study on chemical constituents of Abies yuanbaoshanensis THE FRUITING CHARACTERISTICS AND REPRODUCTIVE CAPACITY OFSEEDS OF ABIES YUANBAOSHANENSIS Study on the Structure and Spatial Pattern of the Endangered Plant Population of Abies yuanbaoshanensis Characteristics of geographic distribution of four critically endangered species of Abies in subtropical China and its relationship with climate A Study on the Niches of Main Tree Populations in Abies yuanbaoshanensis Community