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凡是具有零度或零度以下的土、土壤和岩石,其中的水全部或部分与矿物颗粒冰冻胶结时,统称作冻土。冬季冻结,夏季融化的,叫季节冻土;常年处于冻结状态的,叫多年冻土。季节冻土遍及我国长江以北及其以西地区,而多年冻土区大约占我国面积的25％(包括东北北部和青藏高原以及西北山地)。多年冻土,世界上主要分布在高纬度寒带地区。在中低纬度地带,青藏高原是唯一的大面
All soils, soils, and rocks that have a temperature of zero or below, where all or part of the water is frozen cemented with mineral particles, are collectively referred to as frozen soil. Frozen in winter, melting in summer, called seasonal frozen soil; perennial frozen, called permafrost. Seasonal frozen soil covers the north of the Yangtze River and the area to the west of the country, while the permafrost region accounts for about 25% of China’s area (including the northeastern northeast and the Qinghai-Tibet Plateau and the northwest mountainous regions). Permafrost is mainly distributed in the high latitude cold regions in the world. In the middle and low latitudes, the Qinghai-Tibet Plateau is the only major area