2021年12月8日 星期三
鹅掌楸致濒的生态因素研究
A study on the ecological factors of endangering mechanism of Liriodendron chinense (Hemsl. ) Sarg.
1996年 第5卷 第1期 页码[1-8]    下载全文[1MB]  
摘要

鹅掌楸(Liriodendron chinense(Hemsl.)Sarg.)为古老残遗植物,该属植物在第三纪曾广布于北半球。由于第四纪冰川的压力,现存中国鹅掌楸局限星散分布于被称作“避难所”的长江流域以南亚热带山地,其种群大小和结构,受到与其共存的优势树种的竞争压力及人为干扰等多方面因素影响。目前天然分布的鹅掌楸,其种群规模小,在原生境中往往种子饱满率偏低,尤其是位于分布区东部的种群,正处于非适宜的“濒危生境”中。如果物种陷入了因地质历史变化、种间竞争或其他灾难引起的“濒危生境”中,运用迁地保护手段,可有效地保护该物种。

Abstract

Liriodendron chinense (Hemsl. ) Sarg . is an archaic plant native to eastern Asia. This genus was once widely distributed in the North Hemisphere in the Tertiary period.Because of the pressure from glacier movement in the Quaternary period, populations of L. chinense had been restricted in southern areas of Yantze River in so-called "refuges". Population size and structure gre effected by different factors, such as, forest canopy density and artificial interference etc. According to the obvious character of the small populations with low viability of seeds, especially those located in the eastern part of its distribution area in China they are now really in a non-suitable habitat-" endangering habitat ". For species' falling into " endangering habitat " caused by geohistorical changes, interspecific competition or other disasters, the exsitu
conservation is especially important.

关键词鹅掌楸; 种群; 濒危生境;
Key wordsLiriodendron chinense (Hemsl. ) Sarg.; population; endangering habitat
作者贺善安 ,郝日明 ,汤诗杰
所在单位江苏省中国科学院植物研究所江苏省植物迁地保护重点实验室,南京市210014
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基金项目国家自然科学基金;