土壤水分监测技术方法应用比较研究

Comparative Study on Soil Moisture Monitoring Methods

土壤墒情是反映旱情最直接的重要指标,土壤水分是植物水分的直接来源,决定着植物的生长状况的好坏,因此测量土壤水分有着重要的实际意义。近年来,随着抗旱工作的全面深入开展,土壤水分监测工作日益得到重视,土壤水分自动监测仪器逐步推广应用,但由于水利系统开展土壤水分自动监测较晚,对其工作原理认识不足。本文在概述土壤水分常用监测技术方法基础上,较为系统的介绍了频域反射法(FDR)和时域发射法(TDR)工作原理,以及有关数学公式,评述了主要监测技术方法的优缺点,并对今后有关工作开展提出了建议。

The soil moisture is the most direct and important index to reflect the drought, soil water is the direct source of the plant water, deciding the plant growth condition, so the measurement of soil water has important practical significance. In recent years, along with the drought relief developing, soil moisture monitoring has been paid attention on, and automatic instruments for soil moisture monitoring have been gradually used. Because of later creation of the soil moisture automatic monitoring in water re- sources departments, the people have not enough understanding of the working principle. Based on introduction to soil moisture monitoring technology, this paper described in detail the working principle of the Frequency Domain Reflectometry （FDR） and Time Domain Reflectometry （TDR）, and the relevant mathematical formulas. The advantages and disadvantages of the monitoring tech- nology were reviewed, and some suggestions were made for the future.