云南冬樱花的群落特征及地理分布

云南冬樱花群落共有种子植物1421种，分属158科。696属，科、属、种的区系成分都以热带成分占显优势，分别为74．42％，76．08％，66．31％(不包括世界分布)，说明该区系种子植物具显的热带性质。该区系与泛热带和热带亚洲联系最为密切，同时与热带大洋州、热带非洲、热带美洲、北温带、东亚等有一定程度的联系，而与地中海区、西亚、中亚联系最少。另外，该区系特有现象不十分显，特有科、属、种比例低于不同纬度上相邻的滇中高原和云南热带地区。

Community Characteristics and Phytogeographical Meaning of Cerasus cerasoides in Yunnan Province

There are 1 421 species of seed plants,belonging to 696 genera and 158 families in this flora of Cerasus cerasoides.Analysis of the floristic elements based on species,genera and families shows that the tropical elements are dominant in the flora including 74.42% family of all family(excluding cosmopolitan,the same as following),76.08% tropcial genera of all genera,66.31% tropical speciea of all species.Therefore the floristic characteristics is obviously tropical.Besides,the flora has closely relationship with Pantropic and Tropical Asia elements as well as Trop.Australasia,Trop.Africa,Trop.America,North Temperate and East Asia.However,there are little relationship with Mediterranea,West Asia and Centra Asia.The endemic taxa are not very obvious,and the rate of the endemic families,genera or species is lower than that of central Yunnan Plateau as well as other tropical of Yunnan where are adjacent regions of different latitude.