作　　者： ; ; ; ;

机构地区： 吉首大学生物资源与环境科学学院生态研究所

出　　处： 《西北植物学报》 2004年第5期865-871,共7页

摘　　要： 武陵山地区含有中国种子植物特有属72个,占该区种子植物总属数的7.16%,占全国同类属数的28.69%,占华中同类属数的77.42%.其基本特征为: 1 古老与孑遗的木本植物众多,并存在一定相对年轻的成分; 2 地理成分多样,具明显的亚热带性质,表现出四方汇集和东、西、南、北的过渡性质; 3 水平分布上呈现南、北两个分布中心,垂直分布上以1000m以下的中、低海拔为主; 4 武陵山地区植物区系与神农架、秦岭、湘黔桂交界地区的关系比较密切,而与南岭、武夷山、滇黔桂地区的关系比较疏远.根据武陵山地区中国种子植物特有属的数量、与鄂西～川东特有现象中心 或者三峡中心 所含属的一致性以及地理间的密切联系,可以认为该区是鄂西～川东中心 或者三峡中心 的重要组成部分甚至是核心地带,在华中植物区系中发挥着举足轻重的作用. Wulingshan Mountains region is located between 27°28′ and 30°05′N, 109° 02′ and 111° 33′ E, from 189.4 m to 2 570 m above sea level, with an area of about 100 000 km^2 . There are 72 endemic genera to China of the Spermatophytic flora in Wulingshan region. They take 7.16% of sum of seed plant genera of Wulingshan region, 28.69% of the national endemic genera to China, and 77.42% of the Central-China of endemic genera to China respectively. The flora featured by the followings:(1) The dominate genera are wood genera which expressing archaic and relic elements,but young genera are also inhabited;(2)The flora is subtropical and transitional in nature, and the geographical types are diversified and complicated. It shows that the flora has been assembled from all directions including Wulingshan region and its neighbors;(3)There are two abundance centers(South-Wulingshan Center and North-Wulingshan Center)in horizontal distribution, and most plants in them are at the belt of low-middle altitude (≤1 000 m);(4)The flora is much more closely allied to that of Shennongjia, Qinling and Xiang-Qian-Gui than to Nanling, Wuyishan and Dian-Qian-Gui floras. Based on the amount of endemic genera to China of the Spermatophytic of Wulingshan region, the similarity of genera endemic to China and the connection in geographical relationships between Wulingshan region and West-Hubei and East-Sichuan Center(or Sanxia Center), we think that the flora is located at the core belt in West-Hubei and East-Sichuan Center(or Sanxia Center), which has a very important significant in floristic region of Central China.

关 键 词： 种子植物区系 特有现象 特有属 武陵山地区

领　　域： [生物学]