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首页> 外文期刊>Vadose zone journal VZJ >Single-Probe Heat Pulse Method for Soil Water Content Determination: Comparison of Methods
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Single-Probe Heat Pulse Method for Soil Water Content Determination: Comparison of Methods

机译：土壤水含量测定的单探针热脉冲法：方法比较

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摘要

The estimation of soil thermal conductivity (lambda) using the single-probe heat pulse (SPHP) method is well known, but estimation of soil water content (theta) using the SPHP is poorly understood. In this study, we examined six methods-lambda, normalized cumulative temperature increase (TNcum), normalized maximum temperature increase (TNmax), and the reciprocals of each-for theta estimation using the SPHP. The temperature response curves of four soils at different theta were measured following 600-s heat pulses with heating strengths of about 6 W m(-1), from which lambda, TNcum, and TNmax values were determined. The maximum measurement errors of these three methods were 0.11 m3 m(-3) for the coarse sand and 0.01 m(3) m(-3) for the fine sand, sandy loam, and silty clay, except for 0.05 m(3) m(-3) for the fine sand by the lambda(theta) method. The predicted theta from all of the lambda, TNcum, and TNmax methods agreed well with that from the oven-dry method for all soils with the exception of the TNcum(theta) and TNmax(theta) methods for the coarse sand for theta > 0.20 m(3) m(-3). The measurement errors and theta predictions of the 1/lambda(theta) method were similar to that of the TNcum(theta) and TNmax(theta) methods, and that of the 1/TNcum(theta) and 1/TNmax(theta) methods were similar to that of the lambda(theta) method. Because each of the six methods worked well for only some soils, improved estimations were obtained when the lambda(theta) method was combined with the 1/TNcum(theta) [or 1/TNmax(theta)] method for coarse-textured soils and the 1/l(theta) method was combined with the TNcum(theta) [or TNmax(theta)] method for fine-textured soils.
机译：使用单探针热脉冲（SPHP）方法估算土壤热导率（lambda）是众所周知的，但使用SPHP估算土壤水分（θ）的方法知之甚少。在这项研究中，我们检查了六种方法-λ，归一化累积温度升高（TNcum），归一化最大温度升高（TNmax）以及使用SPHP估算theta的倒数。按照600 s的热强度约6 W m（-1）的热脉冲，测量了四种土壤在不同theta的温度响应曲线，从而确定了λ，TNcum和TNmax值。这三种方法的最大测量误差为：粗砂为0.11 m3 m（-3），细砂，沙壤土和粉质粘土为0.01 m（3）m（-3），除了0.05 m（3） λ法测量细砂的m（-3）。来自所有lambda，TNcum和TNmax方法的预测theta与针对所有土壤的烘箱干燥方法的预测theta吻合得很好，但theta> 0.20的粗砂的TNcum（theta）和TNmax（theta）方法除外m（3）m（-3）。 1 /lambdaθ方法的测量误差和theta预测类似于TNcumθ和TNmaxθ方法的测量误差和theta预测，以及1 / TNcumtheta和1 /TNmaxθ方法的测量误差和theta预测与lambdaθ方法相似。因为这六种方法中的每一种仅对某些土壤都适用，所以将lambdaθ方法与1 / TNcumtheta [或1 /TNmaxθ]方法结合用于粗糙结构土壤时，可以得到更好的估计。 1 /lθ方法与TNcumtheta [或TNmaxθ]方法结合用于细纹理土壤。

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