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首页> 外文期刊>Vadose Zone Journal >Laboratory Evaluation of the Dual-Probe Heat-Pulse Method for Measuring Soil Water Content
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Laboratory Evaluation of the Dual-Probe Heat-Pulse Method for Measuring Soil Water Content

机译：双探针热脉冲法测量土壤含水量的室内评价

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摘要

The dual-probe heat-pulse (DPHP) method provides a means of estimating volumetric soil water content () and change in volumetric water content () from measurements of volumetric heat capacity. The purpose of this investigation was to characterize the accuracy and precision that can be achieved in measuring and with the DPHP method. Tempe pressure cells fitted with DPHP sensors were used to conduct desorption experiments in which DPHP-based estimates of and were compared with values estimated by the gravimetric method. For water contents corresponding to soil water pressure potentials below -100 kPa, comparisons were made by packing the pressure cells with soil wetted to known water contents. The investigation was conducted with seven soil materials representing a wide range of physical properties for mineral soils. The DPHP sensors slightly overestimated at low water contents, but it was shown that the bias could be removed by using an empirical calibration equation, = 1.09 DPHP - 0.045. This relationship appears to be general inasmuch as it was shown to be applicable for all seven soil materials and for water contents ranging from 0.02 to 0.59 m3 m-3. The general calibration equation was also shown to be effective in removing bias in estimates. Pooled regression analysis (all soil materials) showed that can be measured with a root mean square error (RMSE) of 0.022 m3 m-3. Greater precision can be achieved with measurements (RMSE = 0.012 m3 m-3); however, the results indicated a decrease in precision with increasing magnitude of .
机译：双探针热脉冲（DPHP）方法提供了一种 估算土壤体积水含量（）和通过测量体积热容量来估算体积 含水量（）的方法。 。 本研究的目的是表征使用 DPHP方法可以实现的精度 和精度。 使用装有DPHP传感器的坦佩压力传感器进行解吸实验，在该实验中，基于DPHP的估算值 并与重量法估算的值 进行比较。方法。对于与低于-100 kPa的土壤水分压力 相对应的水分含量，通过用浸有已知水分含量的土壤的压力容器装填 进行比较。 >使用代表 矿物土壤的多种物理特性的七种土壤材料进行了研究。 DPHP 传感器在低水含量下略有高估，但它显示通过使用经验性的 校准方程可以消除偏差，该校准方程= 1.09 DPHP -0.045。该关系 似乎是通用的，因为它被证明适用于所有七种土壤材料和 0.02至0.59 m的水含量 3 m -3 。通用校准方程式 还显示出可以有效地消除估计偏差。合并 回归分析（所有土壤材料）显示，可以 进行测量，均方根误差（RMSE）为0.022 m 3 m -3 。 通过测量可以实现更高的精度（RMSE = 0.012 m 3 m -3 ）;但是，结果表明 的精确度随着。 的增加而降低

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  • 来源
    《Vadose Zone Journal》 |2003年第3期|389-399|共11页
  • 作者

    J. M. Basinger; G. J. Kluitenberg; J. M. Ham; J. M. Frank; P. L. Barnes; M. B. Kirkham;

  • 作者单位

    Plant and Soil Science Department, Texas Tech University, Lubbock, TX 79409;

    Department of Agronomy, Kansas State University, Manhattan, KS 66505;

    Department of Agronomy, Kansas State University, Manhattan, KS 66505;

    Rocky Mountain Research Station, U.S. Forest Service, 240 W. Prospect Rd., Fort Collins, CO 80526;

    Department of Biological and Agricultural Engineering, Kansas State University, Manhattan, KS 66505;

    Department of Agronomy, Kansas State University, Manhattan, KS 66505;

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