摘要
FDR (FrequencyDomainReflectometry)频域反射仪是一种用于测量土壤水分的仪器 ,它利用电磁脉冲原理、根据电磁波在介质中传播频率来测量土壤的表观介电常数 (ε) ,从而得到土壤容积含水量 (θv)。介绍了FDR系统的测量原理、系统安装、测量方法及其在土壤水分连续动态监测中的应用 ,并对实际测量结果进行了校正 ,可以作为FDR校正的参考。在半干旱区皇甫川流域的应用实践表明 ,FDR具有简便安全、快速准确、定点连续、自动化、宽量程、少标定等优点 ,是一种值得推荐的土壤水分测定仪器。
FDR (frequency domain reflectometry) is designed to measure the soil moisture content (θv) by using electromagnetic technique, that is, the travel frequency of electromagnetic waves in the soil matrix determines the apparent dielectric constant (ε) and hence the volumetric moisture content of the soil matrix. A set of FDR system and its principles of operation, installation, measurement and its application in the sequential dynamical monitoring of soil moisture content are introduced in this paper. Furthermore, the measured results of soil moisture content are calibrated, which can be used as the reference to calibrate the FDR systems. The practical application in the Huangfuchuan watershed, a semi-arid area, shows that the FDR system has the safe, simple, quick, accurate, dynamic and sequential advantages in measuring soil moisture content, and also has the large range and easy calibration. Therefore, the FDR system is recommendable for measuring soil moisture content.
出处
《干旱区研究》
CSCD
2003年第4期247-251,共5页
Arid Zone Research
基金
国家重点基础研究发展规划项目 (G2 0 0 0 0 1860 7)资助
