• 责任者：Jin Huijun (Cold and Arid Regions Environmental and Engineering Research Institute ; Chinese Academy of Sciences ; Lanzhou 730000 ; China) ; Wang Shaoling
• 刊名：Scientia Geographica Sinica
• 出版年：2009
• 卷期：29(2)
• 关键词：多年冻土 ; permafrost ; 环境退化 ; environmental degradation ; 大兴安岭 ; Greater Higgnan Mountains ; 小兴安岭 ; Xiao Hinggan Mountains
• 页码：p.223-228
• 图表：2 tables, 32 refs.
• 分类号：1800
• issnNo：ISSN1000-0690
• isbnNo：CN22-1124/P

Due to the combined influences of climate warming and anthropogenic activities, permafrost degradation has accelerated during the last decades. Permafrost has been degrading more rapidly in the southern parts and urbanized areas, and in the cultivated and felled or cleared woodlands than in the northern parts, countryside, forested areas, and primeval forests. Permafrost degrades sooner at higher elevation, on the mountains, and on sunny slopes than at lower elevation, in the valleys and on the shadowy slopes. Permafrost degrades more readily and more rapidly in the following order of the cultivated or barren land, grasslands, shrubs, woodlands, and wetlands. The latitudinal and elevational zoning controls permafrost degradation, but local factors also have important influences, resulting in abrupt changes in permafrost conditions.