Baiwan New Distribution Community Characteristics of Firmi-ana danxiaensis,an Endemic Species of China
Firmiana danxiaensis is a national key protected plant of Class Ⅱ,and endemic to China.A new concentrated distribution of F.danxiaensis was found based on the field survey in Baiwan Provincial Nature Reserve in Qingyuan City,Guangdong province.In order to understand the community structure and popula-tion characteristics of F.danxiaensis in limestone landscapes,we used sample methods to investigate and comparatively analyze the community characteristics of F.danxiaensis in different landscapes and among dif-ferent distribution points.The results showed that:(1)A total of 38 vascular plants were recorded among 12 plots,which belong to 30 families and 36 genera.The angiosperms are absolutely dominant,with barely few ferns but no gymnosperms;and the seed plants are dominated by the tropical components,followed by the pantropical and tropical Asian components.(2)Plots 11,12,6,and 3 are the top 4 communities with the high-est number of F.danxiaensis.The age structure of community is stable,the growth advantages of F.danxi-aensis in the tree layer is greater than that of shrub and grass layer,respectively.(3)The species abundance of F.danxiaensis community in Baiwan distribution point is lower than that of Danxia Mountain,Nanxiong and Yingde.The floristic geographical elements are similar.In terms of height structure and diameter at breast height,the Baiwan communities of F.danxiaensis are both higher than Danxia Mountain communi-ties,while lower than Nanxiong Yuanyang Lake communities.In summary,the F.danxiaensis grows well in Baiwan new distribution point,which provides resources for its conservation study.It is suggested that this new concentrated distribution point of F.danxiaensis should be set as a in situ protected district with contin-uous and stable monitoring system,which plots 11,12,6,and 3 as focus.
万方数据
维普
