魏鸿怡,孟繁佳.基于四端法和时域反射法的土壤电导率测量研究[J].农业机械学报,2019,50(Supp):237-242.
WEI Hongyi,MENG Fanjia.Soil Electrical Conductivity Measurement Based on Four-terminal Method and Time Domain Reflectometry Method[J].Transactions of the Chinese Society for Agricultural Machinery,2019,50(Supp):237-242.
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基于四端法和时域反射法的土壤电导率测量研究   [下载全文]
Soil Electrical Conductivity Measurement Based on Four-terminal Method and Time Domain Reflectometry Method   [Download Pdf][in English]
投稿时间:2019-04-20  
DOI:10.6041/j.issn.1000-1298.2019.S0.037
中文关键词:  土壤电导率  四端法  时域反射法  测量
基金项目:国家自然科学基金项目(31401294)和国家重点研发计划项目(2018YFD010100202)
作者单位
魏鸿怡 中国农业大学 
孟繁佳 中国农业大学 
中文摘要:为探究电流-电压四端法和时域反射法两种接触式测量方法在不同质地土壤和不同含盐量、含水率土壤的适用性,设计基于“电流-电压”四端法的土壤电导率测量仪,对其标定并与时域反射法进行对比试验。标定结果表明,当电导率在0~14mS/cm范围内时,该仪器具有较高准确度。不同含水率的对比试验结果表明,四端法和时域反射法在一定含盐量范围内都具有较好的线性度;而当砂质壤土含水率为20%、含盐量大于0.6%时,四端法电导率测量仪测得的电导率基本保持不变;当粉质黏土含水率较低和较高时,电导率均变化不大,因此在使用时应尽量避免在土壤含水率较低和较高时进行测量。不同质地土壤的对比试验表明,四端法和时域反射法均在含盐量较低时受土壤质地影响较小,在含盐量较高时受土壤质地影响较大。
WEI Hongyi  MENG Fanjia
China Agricultural University and China Agricultural University
Key Words:soil electrical conductivity  four terminal method  time domain reflectrometry  measurement
Abstract:Obtaining farmland information quickly and efficiently is the basis of precision agriculture.“Current voltage” four terminal method and time domain reflectrometry (TDR) are two main methods for contact measurement of soil conductivity. A soil conductivity instrument based on the principle of “current voltage” four terminal method was designed, which was calibrated and compared with TDR to explore the applicability of the two methods. The calibration results showed that when the electrical conductivity was in the range of 0 and 14mS/cm, the determination coefficient R2 reached 0.960, and the instrument had high accuracy in this range. The results of soil contrast test showed that the four terminal method and TDR had good linearity under the condition of low salt content and water content, but when the salt content of sandy loam was more than 0.6%, the change of conductivity measured by four terminal method tended to be smooth. When the moisture content of silty clay was 20% and 25%, the measurement data of the two instruments were basically the same, so it was needed to try best to avoid measuring when the soil moisture content was high. The comparative experiments under different texture soils showed that the four terminal method and TDR were greatly affected by the soil type, and the higher the clay content of the soil was, the smaller the conductivity of the soil was. During the test, the four terminal conductivity meter can measure in real time, but the time of each TDR measurement was about 20s, which was not conducive to real time measurement.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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