| 吕国华,李子忠,赵炳祥,赵晓燕,肖志广.频率域反射仪测定土壤含水量的校正与田间验证[J].干旱地区农业研究,2008,(4):33~37 |
| 频率域反射仪测定土壤含水量的校正与田间验证 |
| Calibration and verification of Frequency Domain Reflectometry to measure soil water content |
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| DOI：10.7606/j.issn.1000-7601.2008.04.07 |
| 中文关键词: 频率域反射仪 土壤含水量 校正 |
| 英文关键词:FDR soil water content calibration |
| 基金项目:北京市科委资助项目(D0605001040291) |
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| 中文摘要: |
| 为了获得精确的土壤含水量测定数据,在室内和田间分别进行了频率域反射仪(FDR)测定土壤含水量的校正,并在田间运用土钻取样和烘干法对模型参数进行了验证。结果表明,室内试验获得了较好的模型参数,均方根误差平均达到了0.023 m3/m3,但是应用到田间条件下误差很大,均方根误差平均为0.066 m3/m3;田间条件下也间接获得了较好的模型参数,均方根误差的平均值为0.026 m3/m3,应用于田间时测定含水量的精确度较高,均方根误差的平均值为0.026 m3/m3。因此,对于构成复杂的城市或园林土壤,在不挖剖面或土钻取样破坏土壤的前提下,建议采用田间间接法进行校正。 |
| 英文摘要: |
| Frequency Domain Reflectometry （FDR） is an effective instrument of measuring soil volumetric water content but it need a good calibration. The experi ments were carried out to calibrate FDRin the lab and field and calibration equations were verified by oven-dried method for soil samples obtained by augers. The result showed that good calibrating equations with average RMSE 0．023m3／m3 were fitted in the lab but they had poor RMSE 0．066m3／m3 when used in the field. Other calibrating equations with average RMSE 0．026 m3／m3 were also fitted by indirect field calibration method and they had good RMSE 0．026 m3／m3 when used in the field. Therefore theindirect filed calibration method can be usedin complex soils in a garden or a city to avoid destroying soil. |
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