西藏芜塘高原高寒草原的基本类型与特征

 羌塘高原，地势高亢，气候寒冷干旱，发育着面积广阔的高寒草原植被。本文论述了高寒草原的区系组成，地理成分、生活型和层片、生态类群与生长发育节律等方面的特点，描述了7个主要群落类型，并探讨了它们的生态地理分布规律。在对羌塘高寒草原与我国温带草原进行比较分析的基础上，将高寒草原作为植被亚型，与温带草原并列于草原植被型之下；在进行地植物学区划时，应该充分考虑羌塘高原高寒草原的广泛分布及其地带性景观意义。

Main Types and Characteristics of High-Cold Steppe in the Qingtang Platem of Xizang

The high-cold steppe is extensively distributed in the Qiangtang Plateau, Xizang autonomic region. This paper discusses the floristic composition, geographical elements of flora, life-forms and synusiae as well as ecological groups and growth rhythm of this type of vegetation. Seven groups of the steppe with reference to their ecological distribution principles are described. In comparison with the characteristics of the temperate steppe in the north, this type of steppe is remarkably distinct with the former. Both may be regarded as subtypes of the steppe.