Monitoring of frozen soil hydrology in macro-scale in the Qinghai-Xizang Plateau

Monitoring of frozen soil hydrology in macro-scale was performed by Chinese and Japanese scientists from 1997 to 1998. Quality measured data were obta ined. Measured data on soil moisture and temperature are preliminarily anal yzed. Based on profiles of soil temperature and moisture in individual meas ured sites, intra-annual freezing and melting process of soil is discussed. Maximum frozen and thawed depths and frozen days in various depths are est imated. The work emphasized the spatial distribution on soil temperature an d moisture in macro-scale and the effect of topography on conditions of soi l water and heat.