土壤热性质的研究是分析地表能量平衡的重要途径之一,土壤热扩散率是表征土壤热性质的重要参数。根据非稳态一维热传导方程的差分解计算了不同质地土壤的热扩散率。结果表明,风干土热扩散率小于1.4×10-3cm2.s-1,并随着时间的推移逐渐减小;土壤质地越轻土墒条件越好热量传输速度越慢。 The study of soil thermal properties is one of the important ways to analyze the balance of surface energy. Soil thermal diffusivity is an important parameter to characterize soil thermal properties. The thermal diffusivities of soils with different textures were calculated according to the difference solution of the unsteady one-dimensional heat conduction equation. The results showed that the thermal diffusivity of dried soil was less than 1.4 × 10-3cm2.s-1, and gradually decreased with the passage of time. The lighter the soil texture was, the better the moisture transfer was.