祁连山中段新冰期以来的冰川序列及环境变化

The stage-division and environmental significance of moraine in Qiyi glacier, Qilian Shan

通过对七一冰川及其附近冰碛垅形态、植被覆盖、岩石种类及Schmidt hammer反弹R值、剖面内部组成的观测、对比和分析,认为新冰期时冰川扩张到海拔4 km处,较现代冰川末端降低约300 m,冰川前进约2 km左右．小冰期的三列冰碛垅形成时间间隔基本相同,规模依次减小,表明小冰期的三次冷期中以15世纪最冷,持续时间最长,而17世纪次之,19世纪持续时间最短．

The observations and comparisons of the features of debris, lichens, vegetation, soil weathering and R-values of Schmidt hammer indicate that the 7.1 glacier had advanced about 2 km and reached 4 km in the Neoglaciation. During the little ice age, three end moraines were formed in sequence, which demonstrates that the temperature in the 15th century was lowest and might have lasted a much longer time in little ice age. Moreover, the temperature in the 17th century was colder than that in the 19th century.