| 引用本文: | 胡慧玲,王 峰,冯泉清,等.盐分对土壤水分传感器测量精度的影响及适用性评价[J].灌溉排水学报,2023,42(9):102-109. |
| HU Huiling,WANG Feng,FENG Quanqing,et al.盐分对土壤水分传感器测量精度的影响及适用性评价[J].灌溉排水学报,2023,42(9):102-109. |
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| 摘要: |
| 【目的】探明盐分和水分对土壤水分传感器测量精确度和准确度的影响，并进行适用性评价。【方法】在新疆阿拉尔兵团第一师灌溉试验站开展室内试验，选用FDR、TDR型传感器，试验设置5个盐分梯度（分别为2、3、5、7、9 mS/cm），土壤含水率调至田间持水率之后自然蒸发，研究盐分和水分对土壤水分传感器测量精确度和准确度的影响。【结果】传感器的精确度和准确度受土壤盐分和水分的影响。标定前，CSF11、ML2x传感器的准确度较高且精确度表现稳定，EC-5、TDR305H传感器由于受土壤盐分和水分的双重影响，准确度和精确度较低。校准后，4种传感器的准确度和精确度明显改善。【结论】综合准确度、精确度和价格因素，资金充裕且含盐量不超过9 mS/cm时，可选用ML2x传感器；资金紧张时，低盐条件下选用CSF11传感器，中高盐条件下选用EC-5传感器；当土壤含水率不超过20%时可选用TDR305H传感器。 |
| 关键词: 土壤水分；FDR；TDR；土壤含盐量；精确度；准确度；校准 |
| DOI：10.13522/j.cnki.ggps.2023066 |
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| The Effect of Soil Salinity on Accuracy of Soil Moisture Sensors |
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HU Huiling, WANG Feng, FENG Quanqing, HAN Qisheng, NING Huifeng, LI Xiaogang, WANG Jinglei
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1. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences/
Key Laboratory of Crop Water Requirement and Regulation, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China;
2. Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China;
3. Xinjiang Production and Construction Corps First Division Hydrology and Water Resources Management Center, Alaer 843399, China
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| Abstract: |
| 【Objective】Soil moisture sensors have been increasingly used in different fields to measure soil water content at high temporal resolution, but its reliability depends on many factors. In this paper, we investigate the effect of soil salinity on their accuracy.【Method】The laboratory experiment was conducted at the Irrigation Test Station of the First Division of Xinjiang Alaer Corps. FDR and TDR sensors were used in the experiment. We compared five salinity treatments: 2, 3, 5, 7, 9 mS/cm; the soil moisture was adjusted to the field capacity followed by natural evaporation. The absolute error (AE), relative error (RE) and standard deviation (SD) were used to evaluate the accuracy and consistency of the sensors.【Result】Soil moisture and salinity both affected accuracy and consistency of the sensors. Without calibration, the accuracy of the CSF11 and ML2x sensors was high and measurements were consistent, while the EC-5 and TDR305H sensors were less accurate and consistent due to the combined influence of soil salinity and moisture. Calibration significantly improved the accuracy and consistence of all four sensors.【Conclusion】Considering accuracy and consistency, the expensive ML2x sensors worked best when salt content does not exceed 9 mS/cm. The less expensive CSF11 sensors also worked well when soil salt is low. The EC-5 sensors can measure soil moisture reasonably well for soil with moderate and high salinity. When the soil moisture is less than 20 cm3/cm3, TDR305H sensors is accurate and reliable. |
| Key words: soil moisture; FDR; TDR; soil salt content; precision; accuracy; calibration |
