热脉冲法测定土壤热性质的研究进展*

LATEST ADVANCE OF THERMO-PULSE METHOD FOR MEASURING SOIL THERMAL PROPERTIES

土壤热性质包括土壤热容量、热扩散率和导热率等,是决定土壤热状况的内在因素,与土壤水分状况之间关系密切。热脉冲—时域反射仪方法所用成本低,对土壤扰动小,测试时间短,具有很多优点,因此在测定土壤热性质方面具有很大的潜力。该方法在国外已得到了大量应用,在国内应用却很有限。本文综述了土壤热性质的计算模型及研究现状,重点针对近年来国内外研究土壤热性质的新方法———热脉冲法的理论和技术发展,及其在土壤水和其他物理性质应用方面的进展。该方法在国内相关研究领域里有进一步推广的意义。

Soil thermal properties include thermal capacity, thermal diffusivity and thermal conductivity. They are intrinsic factors for determining soil thermal conditions and closely associated with soil water conditions. Thermo-Time Domain Reflectometry has many advantages, such as low cost, less disturbance of the soil and time-saving, thus showing great potential in soil research. In this paper, we introduced calculation models for and status of the research on soil thermal properties, with emphasis on development of the theory and technology of a new method. Thermo-Time Domain Reflectometry, for determination of soil thermal properties, and advances in its application to the research on soil water and other soil physical properties. The new method has recently been extensively used abroad but quite limitedly at home. It is worth further popularizing in related research fields in the country.