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武陵山地区种子植物区系特征及植物地理学意义 被引量:36

Characteristics of Spermatophyte Flora of Mt.Wulingshan Region from Central China and Its Phytogeographical Significance
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摘要 武陵山地区地处湘鄂川黔交界 ,面积约 10万km2 .从科、属、种水平对该区种子植物区系特征进行研究 ,结果表明 :①该区产种子植物 2 0 1科、 10 0 5属、 4119种 ;地理成分以亚热带 (至温带 )分布为主(占总属数的 5 6 8%和总种数的 90 49% ) ;中国特有属 6 4属 ,中国特有种达 2 6 82种 (其中武陵山地区特有12 6种、武陵山区以外的华中区特有 6 75种 ) .②该区保存有长苞铁杉、水杉、粗榧、厚朴、鹅掌楸、水青树、檫木、杜仲、领春木等大量古老属种 ,而且已证实该地区是青荚叶科、珙桐科以及台湾杉属、星果草属、八角莲属、马蹄芹属等的起源或重要分化地 ;③该区与邻近区系具广泛交流和渗透 ,经初步确定分别有 10 9种、 96种、 6 7种和 10 9种以武陵山地区为分布区东界、西界、南界和北界 ;另外所含东亚成分由西向东方向分布式样的 35 9种中 ,有 30 3种正处于该方向迁移和扩散的重要通道 (武陵山走廊 )上 .因此 ,武陵山地区在中国植物区系甚至整个东亚植物区系中具有十分重要的意义 . Mt Wulingshan region locate at 27°28′~30°05′N and 107°02′~111°33′E,covering an area of about 100 000 km\+2.The altitude ranges from 189 4 m to 2 570 m. This paper reported the results of study on floristic feature of the spermatophytic flora of Mt\^Wulingshan region.The results showed:① The flora was considerably rich.There are 4 119 species belonging to 1 005 genera and 201 families.The subtropical_temperate geographical elements of genera was dominant(56\^8% of the total genera and 90\^49% of total species),in which 64 genera and 2 682 species were Chinese endemic (among them 126 species are endemic to Mt\^ Wulingshan and 675 species were endemic to Central China);② The flora was rich of relic species and original taxa,e\^g\^Metasequoia glyptostroboides,Liriodendron chinense,Eucommia ulmoides,Euptelea pleiospermum,etc.Moreover,some families and genera,such as Helwiniaceae,Davidiaceae,Taiwania, Asteropyrum, Dysoma,etc Probably originated form Mt Wulingshan and its neighboring regions;③ The flora of Mt Wulingshan had extensive relationship with surrounding floras.Our analysis indicated that Mt Wulingshan was probably situated at a special distribution boundary, e g it was the east,west,south and north boundary of 109,96,67 and 109 species,respectively;④ Based upon the distribution patterns and migration routes of some East_Asian elements, Mt Wulingshan region was one of the key region of the East\|Asian elements.Among 359 species which migration patterns being mentioned by Wang Wen_cai as from the west to the east,303 species presented in this region.Further,Mt\^Wulingshan as an important floristic channel,i\^e\^Wulingshan channel is considered.
出处 《中山大学学报(自然科学版)》 CAS CSCD 北大核心 2001年第3期74-78,共5页 Acta Scientiarum Naturalium Universitatis Sunyatseni
基金 国家自然科学基金!资助项目 (3980 0 0 12 ) 广东省自然科学基金!资助项目 (970 187) 湖南省青年骨干教师基金
关键词 武陵山地区 种子植物区系特征 植物地理学意义 Mt Wulingshan region characteristics of spermatophyte flora phytogeographical significance
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