摘要
土壤含水量、温度、热特性以及其它物理参数的动态监测是描述土壤中各种物理、化学和生物过程的基础。本文利用热脉冲 -时域反射技术 (Thermo -TDR)对不同质地土壤的含水量、电导率、温度、容积热容量、导热率和热扩散系数进行了测定 ,并利用土壤容积热容量与容重和含水量的关系 ,计算了土壤容重、通气孔度和饱和度。结果表明 ,Thermo -TDR技术能够提供可靠的土壤含水量、温度、容重、通气孔度和饱和度的信息。本文也分析了Thermo
Abstract Dynamic information of soil water, temperature, thermal properties and other physical parameters is vital for de-scribing the physical, chemical, and biological processes in the vadose zone. Recent development of the thermo-Time Domain Reflectometry (Thermo-TDR) opens up an opportunity for such purposes. In this study, the Thermo-TDR technique is applied to simultaneously determine water content, electrical conductivity, heat capacity, thermal conductivity, and thermal diffusivity in soils of various textures. Soil bulk density, air-filled porosity, and degree of saturation are then obtained from the dependence of soil heat capacity on water content and bulk density. The results indicate that the Thermo-TDR measured soil water, electrical,and thermal properties, as well as other physical parameters, agree well with the results from theoretical models or gravimetric measurements. Further improvement in probe design, waveform interpretation, and determination of the effective probe length will increase the measurement accuracy of the Thermo-TDR technique.
出处
《土壤学报》
CAS
CSCD
北大核心
2004年第4期523-529,共7页
Acta Pedologica Sinica
基金
中国科学院知识创新项目(KZCX2411
U871)
国家自然科学基金项目(40025106)
河北省自然科学基金项目(300309)资助
