A dual-probe heat pulse-based sensor that simultaneously determines soil thermal properties, soil water content and soil water matric potential
A dual-probe heat pulse-based sensor that simultaneously determines soil thermal properties, soil water content and soil water matric potential
复制标题
DOI：
10.1016/j.compag.2021.106331
复制
发表时间：
2021-07-28
影响因子：
8.3
通讯作者：
Horton, Robert
中科院分区：
文献类型：
--
作者：
Kojima, Yuki;Kawashima, Tomoyuki;Horton, Robert
双探头热脉冲（DPHP）传感器是一种强大的工具，可以测量土壤热特性和相关的土壤物理特性和过程。研制了一种新型DPHP传感器，可同时测量土壤热特性、土壤含水量和土壤基质水势。通过一系列实验对传感器的性能进行了评价。新的传感器能够以可接受的精度测量每种土壤性质。在对数尺度下，测定基质电位的准确度约为10%。w测量的有效范围是-1000到-2.5 m的水，w测定的精度在-350到-2.5 m的水之间是最好的，其中包括大多数土壤和作物的田间容量和枯萎点的值。该传感器设计包括一根加热丝，可同时向两种不同的材料（即土壤和传感器多孔介质）提供热量输入。只要土壤和传感器多孔介质的导热系数值不存在显著差异，单个电热丝对传感器精度没有影响。新的基于DPHP的传感器可以有效地测量各种土壤特性，包括土壤水基质势、土壤含水量和土壤热特性值。
A dual-probe heat pulse (DPHP) sensor is a robust tool that can measure soil thermal properties and associated soil physical properties and processes. A new DPHP based sensor was developed to simultaneously measure soil thermal properties, soil water content and soil water matric potential. A series of experiments were performed to evaluate the sensor performance. The new sensor was able to measure each soil property with acceptable accuracy. The accuracy of the matric potential determinations was approximately 10% in log scale. The effective range for w measurements was -1000 to -2.5 m of water, and the accuracy of the w determinations was best between -350 and -2.5 m of water, which included values of field capacity and wilting point for most soils and crops. The sensor design included a single heater wire to provide simultaneous heat inputs to two different materials, i.e., the soil and the sensor porous medium. The single heater wire did not influence sensor accuracy as long as the soil and the sensor porous medium thermal conductivity values were not significantly different. The new DPHP based sensor effectively measured various soil properties, including soil water matric potential, soil water content, and soil thermal property values.