【摘要】 利用地理信息系统技术和数理统计学方法,分析了青海高原冻土分布的时空演变规律,揭示了其退化的若干事实.研究表明:季节冻土和多年冻土在青海高原分布十分广泛;季节冻土具有显著的年内变化特征,冻土的融化过程通常较冻结过程复杂的多,且与地形因子和土壤特性等具有密切的关系.近几十年来,冻土表现为地温显著升高、冻结持续日数缩短、最大冻土深度减小和多年冻土面积萎缩、季节冻土面积增大以及冻土下界上升等总体退化的趋势.更多还原

【Abstract】 By using a mathematical statistic methods, geographical information system technology, the space-time evolution of permafrost in Qinghai province is analyzed,and some evidence of permafrost degradation is found. The area of seasonal frozen soils and permafrost is rather wide in the province. The monthly variation of seasonal frozen soils is significant. Usually,the thawing process of permafrost is more complicated than its freezing process,and has a very close relationship with soil characteristics and topographic factors. In the last 10 years,permafrost is in degradation due to distinct increasing of ground temperature, shortening of freezing period,decreasing of the maximum frozen depth,shrinking of permafrost area, enlarging of seasonal frozen soil area, and arising of permafrost base.更多还原