大通河流域植物区系
The Flora of Datong River Valley in Qinghai,China

吴玉虎

文摘	大通河流域共有野生种子植物77科、368属、1 154种.分别占本区所属的青藏高原植物亚区唐古特地区总科数的85.56%、总属数的72.44%、总种数的50.50%.区系特征如下:(1)本区是唐古特地区一个值得提倡大力保护的植物模式标本的集中产地,种类相对较丰富.(2)属的分析表明,本区属于以北温带成分,特别是欧亚大陆温、寒地带典型成分为优势的,兼具温性、寒温和高寒类型的温带区系性质.(3)区系具有年轻和衍生的性质.具体表现在木本类型较少,多年生草本多,缺乏古老的和原始的类群,一些中国特有属种为衍生类群.(4)作为青藏高原的边缘地带和过渡区系,本区系在受到我国华北区系和西南高山区系的双重影响的同时,保持了其高原、高山类型的区系性质.(5)为我国黄土高原植物区系向青藏高原植物区系过渡的代表区系之一.本文的分析表明,在中国种子植物区系分区中,本区属于青藏高原植物亚区中的唐古特地区.
其他语种文摘	The Datong River valley is situated in eastern Qinghai, China, and between latitude 36°45'-38°20' N and longitude 98°50' - 103°00' E. This area belongs to the transition zone between Qinghai-Ti-betan Plateau and Loess Plateau with altitudes ranging from 1 900 m to 5 254 m. The total area is 17 600 km~2. The features of climate are the type with the continent or alpine continent. There are 1 154 species of wild seed plants that belong to 77 families and 368 genera in this region, and it has 85.56% of total family, and of 72.44% of total genera and of 50.50% of total species of the Tangute Region from the Qinghai-Tibetan Plateau Subdivision respectively. The floristic characteristics in the area are as follows: (1) This area is a type locality of many species in the Tangute Region that is well worth protecting, and the species are relatively richer. (2) On the level of genera, the flora belongs to the nature of the temperate zone that mainly with the North Temperate elements, especially dominated with the typical elements from the warm and cold zone of Europe and Asia continents, and also with warm, cold warm and alpine ones. (3) The flora is a young and derivative one, i.e. most of the plants are perennial herbs and poorest on trees, short of the ancient type and primitive species, and some endemic elements of China are developed from their related taxa. (4) Being the area of the border of the Qinghai-Tibetan Plateau and the transition flora that far from the hinterland of the Qinghai-Tibetan Plateau, while the flora was affected by both alpine one of SW China and other one of N China. It keeps the floristic nature of plateau and alpine. (5) It is one of representative floras of the transition zone between the Loess Plateau and Qinghai-Tibetan Plateau of China. By the analysis of this study, it is indisputable that the flora of Datong River valley belongs to the Tangute Region, Qinghai-Tibetan Plateau subdivision.
来源	云南植物研究 ,2004,26(4):355-372 【核心库】
关键词	大通河流域 ; 植物区系 ; 区系特征 ; 区系分区
地址	中国科学院西北高原生物研究所, 青海, 西宁, 810001
语种	中文
文献类型	研究性论文
ISSN	0253-2700
学科	植物学
基金	中国科学院生物分类区系学科发展特别支持费项目
文献收藏号	CSCD:1612942