祁连山西段喀克图地区冻土和冰缘的基本特征

考察区属中亚极大陆型干寒区,水分是区内植被、多年冻土的分布、发育和冰缘作用过程及其地貌类型组合的关键因素。与同纬度的祁连山东、中段相比,本区降水少、植被稀疏,雪线、冰缘带下界和多年冻土下界均高,而且冰缘带下界高于多年冻土下界。

BASIC FEATURES OF FROZEN GROUND AND PERIGLACIAL IN THE KAKITU REGION OF WESTERN PART OF THE QILIAN MOUNTAINS

The investigated region is located in extreme continental, arid and fri- gid area in the Mid-Asia.The moisture condition is the key factor for the development and distribution of permafrost and periglacial action and the formation of the periglacial landform.Compared with the east and mid Qi- lian mountains with same latitute zone, the Kakitu region shows that the precipitation is little and the vegetation is rare,meanwhile, the snow-line and the lowest limit of periglacial zone and permafrost are higher, and the periglacial zone higher than permafrost.