摘要
由于土壤特性的时空变异性 ,对土壤含水量、温度、热特性以及其它物理参数的动态监测是土壤学研究的重要课题。本文以热脉冲技术和时域反射技术的理论为基础 ,介绍了利用热脉冲技术 时域反射技术 (Thermo TDR)连续定位测定土壤含水量、电导率、温度和热特性的原理 ,并利用土壤热特性与容重和含水量的关系 ,导出了土壤容重、饱和度和通气孔度的计算公式。
The spatial and temporal variability of soil properties limits the determination of soil physical parameters in situ and in a dynamic way.In this paper the technique of Thermo Time Domain Reflectometry (Thermo TDR) is introduced to make measurements of a wide range of soil physical properties.We outline the theories of TDR technique for water content and electrical conductivity measurement, and heat pulse technique for determination of volumetric heat capacity, thermal conductivity, and thermal diffusivity.Furthermore, the parameters of soil bulk density, air filled porosity, and degree of saturation are derived from the theoretical relationship between heat capacity, bulk density, and water content.
出处
《土壤学报》
CAS
CSCD
北大核心
2004年第2期225-229,共5页
Acta Pedologica Sinica
基金
中国科学院知识创新项目 (KZCX2 411
U871)
国家自然科学基金项目 ( 40 0 2 5 10 6)
河北省自然科学基金项目 ( 3 0 0 3 0 9)资助
