中文摘要：

土壤热参数是耦合包气带水汽热的重要参数,准确赋值热参数对研究地表能量守恒具有重要意义。文章利用旱区风积沙介质土壤剖面温度和湿度资料,采用谐波法计算了不同水位埋深条件下,土壤剖面上5-10 cm、5-20 cm、5-30 cm间的土壤热扩散率;同时,利用3种理论模型对热传导率和热扩散率与土壤湿度的关系进行了研究。结果表明：谐波法在一定程度上高估了土壤热扩散率;校正的Zhaogz模型和Chung＆Horton方程中,随着含水量的增大,热传导率先增加后趋于稳定,热扩散率先增加后减小;而幂函数则是热传导率随着含水量的增加而增大,含水量越大,热传导率偏差越大,热扩散率先增加后趋于稳定。校正的Zhaogz模型能够较好地描述陕北风积沙的土壤热扩率与含水率的关系,可以作为计算热参数的替代方法。

英文摘要：

Soil parameters are very important in the energy balance of surface soil. In this paper, the soil thermal diffusivity at different depths was estimated by the harmonic method using temperature data at depths of 5-10 cm, 5-20 cm and 5-30 cm, respectively, in 3 observation wells with different water tables. The relationship between the thermal parameters and soil moisture were also studied in this paper. The results show that （1） the soil thermal diffusivity was overestimated to some extent by the harmonic method; （2） in Zhaogz-amended and Chung ＆ Horton equations, the thermal conductivity increases and then becomes steady while the thermal diffusivity increases and then decreases with the increasing soil moisture. However, the thermal conductivity increases continuously in a power function while the thermal diffusivity increases and then becomes steady with the increasing soil moisture; （3） the Zhaogz-amended equation is a better method to describe soil moisture and thermal parameters and is recommended to estimate thermal parameters in northern of Shaanxi.