摘要
对猛洞河河谷维管植物区系特征进行了研究,结果表明:猛洞河河谷共有维管植物129科、389属、670种(含变种),其中蕨类植物12科16属25种,裸子植物1科1属1种,被子植物116科372属644种;植物区系以热带性质为主,但温带性质明显,是一个从热带向温带过渡的区系,热带成分属占54.46%,温带成分属占40.06%;特有程度较高,有中国特有属19个,中国特有种有311种,武陵山特有种37种,猛洞河特有种5个;与同地域的区系相比,猛洞河河谷是本区域内泛热带、北温带、东亚分布和中国特有成分的重要分布区。与同类型的河谷区系相比,猛洞河河谷的泛热带成分低于干旱河谷,但高于干暖、干热河谷,温带成分均高于干热、干暖和干旱河谷。此外,中国特有分布属较其它类型的河谷占绝对优势。
The floristic characteristics of vascular plants in Mengdong river valley are analyzed and discussed in this ar- ticle,and five main conclusions are as follows： （1）There are 129 families,389 genera and 670 species （including sub- species） of vascular plants in this region. Among them, 12 families, 16 genera and 25 species belong to Pteridophyte, 1 family,1 genus and 1 species belong to Gymnospermeae,116 families,372 genera and 644 species are Angiosperm; （2）The flora in general display significant tropical distribution property, but the features of temperate zone are also obvious. It has a certain transitional nature with tropical and temperate,for it has 54.46% of tropical elements and 40.06o//00 of temperate elements; （3） The unique level of the plants are high,with 19 genera and 311 species to China and 37 species to Wuling Mountain, 5 species to Mengdong river valley; （4）Compared with the same types of regions, Mengdong River valley is an important distribution of pantropic, north temperate, east Asia and endemic to China in this section. But compared with the different types of valleys,this region has few pantropic distribution than dry val- leys, but more than dry--warm and dry--hot valleys. The temperate distribution are more than dry, dry--warm and dry--hot valleys. Besides, the endemic genera to china in Mengdong River valley occupy a dominant position for other types of valleys.
出处
《绿色科技》
2013年第1期179-185,共7页
Journal of Green Science and Technology
基金
科技部自然科技基础条件平台建设子项目(编号:2005DKA21006)资助
关键词
区系特征
维管植物
猛洞河河谷
floristic characteristics
Vascular plants, Mengdong River valley
