利用CAME-Tibet野外工作期间所取得的藏北高原不同地点一个年周期土壤温度和含水量资料,初步分析了藏北高原不同地点土壤冻融过程及水热分布特征。表明,藏北高原土壤的冻融过程及水热分布存在较大的时空差异。大多数地点浅层土壤均在10月份左右开始冻结,次年4月份左右开始消融,但不同地点冻结与消融的开始时间及冻结持续时间也有所差别。土壤冻融过程的快慢和土壤温度的时空分布状况与土壤含水量的多少有关。各点土壤含水量的分布并不都是随深度的增加而增加,而是表现出一定的高含水层。这种分布特征对土壤的冻融过程及土壤温度的时空分布有较大影响。在夏季风期间,各点土壤含水量在10cm的浅层均较高,但也存在空间差异性。此外,地表状况(如积雪等)也对土壤温度的分布有较大影响。 Based on the data of soil temperature and water content of one year in different locations of the northern Tibet Plateau obtained during the field work in CAME-Tibet, the freeze-thaw process and the distribution of soil water and heat in different locations of the northern Tibet Plateau were analyzed. It shows that there is a big space-time difference in soil freeze-thaw process and hydrothermal distribution in the northern Tibet Plateau. Shallow soil in most locations began to freeze around October and began to melt around April of the following year, but the freezing and thawing durations and freezing durations at different sites varied. The speed of soil freezing and thawing and the temporal and spatial distribution of soil temperature are related to the amount of soil water content. Not all the distribution of soil water content increases with depth, but shows some aquifer. This distribution has a great influence on the soil freezing and thawing process and the spatial and temporal distribution of soil temperature. During the summer monsoon, the soil moisture content at each point was higher in the shallow layer of 10cm, but there was also spatial difference. In addition, the surface conditions (such as snow, etc.) also have a greater impact on the distribution of soil temperature.