【摘要】 武陵山地区位于湘鄂渝黔交界处 ,面积约 1 0万km2 。本文从科、属、种水平对武陵山地区种子植物区系特征和性质进行了统计分析 ,结果表明 :(1 )本区自产种子植物 2 0 1科、1 0 0 5属、41 1 9种 ,其中裸子植物 6科、1 9属、3 6种 ,双子叶植物 1 6 6科 781属、3 4 47种 ,单子叶植物 2 9科、2 0 5属、6 3 6种 ,含单种和少种的科和属及木本植物比较丰富 ;(2 )本区含世界广布科 40科 ,热带分布科 91科 ,温带分布科 70科。含种数较多的科为广布科和热带分布科 ,而主要特征科则是一些主产东亚 (包括中国特有 )的亚热带和温带分布科 ;(3 )本区的属含我国 1 5种分布区类型中的 1 4种 ,其中以北温带分布、泛热带分布和东亚分布三类成分比较集中。中国特有属 6 4属 (占 6 .83 %) ,其中不少可能就起源于本区 (或 )及其周围。温带分布属多于热带分布属 ;(4)种的地理成分有 1 5种类型 ,其中绝大多数属东亚和中国特有 ,它们具有明显的亚热带 -温带性质。中国特有种共计 2 6 82种 ,其中 1 2 6种为本区所特有 ,6 75种为华中区特有 ,其他 1 881种则广泛分布于我国各地并大体上可分为 1 0个亚型。种的地理成分决定了本区现代植物区系的基本特征和性质 ,即在旧的热带区系的基础上蜕化演变而成的温带性亚热带植物区系或亚热带更多还原

【Abstract】 Wulingshan region is located between 27°28′and 30°05′N, 109°02′and 111°33′E, from to 189.4m to 2570m above sea level, with an area of about 100,000km 2 . In this paper, some statistics and comparatively intensive analysis on native seed plants of Wulingshan region were given on family, genera and species, the results show that: (1) The flora is rather rich, there are 4119 species belonging to 1005 genera and 201 families. In which, 36 species belonging to 6 families and 19 genera are Gymnosperm plant, 3447 species belonging to 166 families and 781 genera are Dicotyledoneae plant, 636 species belonging to 29 families and 205 genera. Those families and genera which consits of one or less species takes lagest proportion. The tree plants are also rich (1972 species); (2) Geographical elements of family are dominant in tropical (91 families), 40 families belonging to Cosmopolitan family and 70 families to Temperatical family. Cosmopolitan family and Tropical family including a lot of species, but mostly typical families are subtropical and temperate familiy (especially E.Asia and Endemic to China); (3) there are 14 areal-types of 15 types of genera to China (C.Y.Wu, 1991), in which N. Temperate, Pantropic and E.Asia are dominant. 64 genera (takes 6.83% of total) are Endemic to China, some of them origin in Wulingshan region and its neighbors. Temperate genera are more over teopical genera; (4) There are 15 areal-types of species in the region, most of them belonging to E.Asia and Endemic to China which dominanted in subtropical. There are 2682 species belonging to China endemic elements. In which, 126 species belonging to endemic to Wulingshan region, 675 species belonging to endemic to C.China, other 1881 species can be divide into 10 subtypes distributed in every area of China. The geographical elements of species have decided the character and feature of Wulingshan region seed-plant flora: Based on archaic tropical flora and changed into temperate or subtropical mountanious flora of E.Asia. According to some East-Asian elements distribution patterns and migration routes, Wulingshan region is not only a part of the center of East-Asian elements but also a channel (Wulingshan hall) located on the middle of migration route in west-east direction of East-Asian elements, so we can think it a key region of E.Asia flora.更多还原