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Soil Solution Electrical Conductivity Measurements Using Different Dielectric Techniques

机译:使用不同介电技术的土壤溶液电导率测量

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摘要

Accurate measurements of soil solution electrical conductivity (w) are needed in various applications. One recently developed technique that measures w is the Sigma Probe (SP). The SP is supposed to give accurate readings only slightly dependent on water content () and soil type. To test the performance of the SP, it was compared with another dielectric technique, time domain reflectometry (TDR). Both techniques utilize the dielectric constant (Ka) and bulk electrical conductivity (a) to estimate the w. Measurements of w were obtained in a laboratory experiment using nine different soil types with in the range 0.05 to 0.50 m3 m-3. In each soil type, three different w were used (approximately 0.3, 1.2, and 3.0 dS m-1). The linear wa– model used by the SP contains only one soil specific parameter (K0). Using this model, the SP readings were constant over the encountered range in , whereas the TDR estimation calculated by the same model typically increased at Ka values below the range of 10 to 15. Using the SP with a default K0 value of 4.1 typically gave a w that was ±20% of the true w when w > 1 dS m-1. The error in the w estimation for w lower than 1 dS m-1 can be much larger except in sandy soils. The TDR measurements of w using a conventional wa– model were more accurate in all soil types at all , with root mean square errors that were lower by about 50% compared with the SP readings. However, this model requires soil specific parameters that have to be obtained during a calibration experiment.
机译:在各种应用中都需要准确测量土壤溶液的电导率 w )。 Sigma Probe(SP)是最近开发的一种测量 w 技术。 SP假定 给出准确的读数,但仅略微取决于 的含水量()和土壤类型。为了测试 SP的性能,将其与另一种介电技术(时间 域反射测量(TDR))进行了比较。两种技术都利用电介质 常数(K a )和体电导率( a )来估计 > w w 的测量值是通过实验室实验 使用九种不同的土壤类型获得的,范围在0.05到0.50 m 3 m -3 。在每种土壤类型中,使用了三种不同的 w (分别为 0.3、1.2和3.0 dS m -1 )。 SP使用的线性 w a –模型 仅包含一个土壤特定参数(K 0 )。 使用此模型,SP读数在遇到的 范围内是恒定的,而由同一<​​sup> 模型计算的TDR估计值通常在K < sub> a 的值低于10 到15的范围。使用SP的默认K 0 值为4.1(通常) gave当 w 时, w 等于真实 w 的±20%。 > w w 估计值小于1 dS m -1 的误差可以 除了在沙质土壤中要大得多。使用常规 w a –模型对 w 的TDR测量更准确>在所有土壤类型中,与SP读数相比,均方根误差 降低了约50%。但是, 该模型需要在校准实验期间必须获得 的土壤特定参数。

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  • 来源
    《Soil Science Society of America Journal》 |2003年第4期|1071-1078|共8页
  • 作者单位

    Dep. of Water Resources Engineering, Lund Univ., Box 118, 221 00 Lund, Sweden;

    Dep. of Water Resources Engineering, Lund Univ., Box 118, 221 00 Lund, Sweden;

    Dep. of Water Resources Engineering, Lund Univ., Box 118, 221 00 Lund, Sweden;

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