摘要
祁连山中东部地区多年冻土年平均地温、冻土厚度等基本特征参量与海拔具有明显的相关性,海拔越高,地温越低,厚度亦越厚.年平均地温、厚度与纬度、经度关系不明显,可能与工作范围较小有关.对比分析了地表植被、地层岩性、土层含水(冰)量等局域性(非地带性)因素对冻土年平均地温的影响,发现腐殖层较厚,下伏细粒土层,较高的含水(冰)量对保持多年冻土较低的温度有利.阐述了冻土厚度的变化及其影响因素.与前人工作比较,分析冻土层钻孔测温曲线,发现该地区多年冻土正处于退化之中.
Permafrost is widespread in the Qilian Mountains. Its essential parameters, such as the annual mean ground temperature and permafrost depth, are correlated with altitude obviously. The higher the elevation, the lower the ground temperature and the deeper the permafrost. The relations of annual mean ground temperature and depth of permafrost to latitude and longitude is inconspicuous because of less area being investigated. The influences of local factors on annual mean ground temperature, such as vegetation, stratum, water (ice) content etc., are analyzed. It is found that thicker humus and vegetation, fine grain soil, higher water content are the advantage for keeping lower temperature of permafrost. Contrasting to previous works in these area, it can be concluded that permafrost is degrading in the middle--east section of Qilian Mountains.
出处
《冰川冻土》
CSCD
北大核心
2007年第3期426-432,共7页
Journal of Glaciology and Geocryology
基金
国家自然科学基金项目(40471023)
国家自然科学基金对外交流与合作项目(40640420072)资助
关键词
祁连山
年平均地温
冻土退化
Qilian Mountains
annual mean ground temperature
degradation of permafrost