摘要
若尔盖高原内部年平均气温0.6~3.3℃,气温年较差19.1~21.2℃,已不具备多年冻土形成和保存的气候条件。据1992年7月间试坑和钻孔测温,在1.0~2.2m深处地温为5~8.4℃,浅层地下水温6.0~7.8℃,由此判断不存在多年冻土,季节冻结深度为1.0~2.0m。据冻土现象和试坑资料判断,周围山地海拔4150~4200m以上发育山地岛状多年冻土。区内沼泽演化表明,部分沼泽已疏干或向疏干趋势发展,草场退化和草原沙化已成为本区生态环境的重要问题。
Field investigation shows no permafrost in the interior of the Zoige Plateau. The mean annual air temperature is 0.6~3.3℃, and the annual range of air temperature is 19.1~21 2℃ . It is not cold enough to form permafrost. According to the temperature measurement from pits and boreholes (in July 1992), the ground temperature is 5 0~8 4℃ in the depth of 1 0~2 2 m, and shallow ground water temperature is 6 0~7 8℃. The seasonal frozen depth is 1 0~2 0 m. Permafrost has formed above 4150~4200 m a.s.l. in the mountainous around the plateau according to a permafrost investigation and pit prospecting. The swamp evolution reveals that a part of swamp has been drained and another part will be drained. The degeneration and desertification of grass lands becomes an important problem to ecological environment, impacts livestock.
出处
《冰川冻土》
CSCD
北大核心
1997年第1期39-46,共8页
Journal of Glaciology and Geocryology
基金
国家自然科学基金