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首页> 外文期刊>International journal of soil science >Comparison Between Particle Size Distribution as a Predictor of Pedotransfer Functions using Laser Diffraction and Sedimentation Methods
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Comparison Between Particle Size Distribution as a Predictor of Pedotransfer Functions using Laser Diffraction and Sedimentation Methods

机译：使用激光衍射和沉降法比较粒径分布作为Pedotransfer函数的预测指标

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Background and Objective: Particle size distribution (PSD) is the main predictor variable used in Pedotransfer functions (PTFs). Verification of PTF requires a specialized database. These databases contain PSD measured by sedimentation methods either using pipette or hydrometer method. Recently, laser diffraction method (LDM) is widely used for particle size distribution measurement. The aim of the research was to validate usage of laser diffraction method instead of pipette method for estimating soil saturated hydraulic conductivity, using PTFs. Materials and Methods: Soil saturated hydraulic conductivity (KS) was measured by constant head method technique and calculated by PTFs. The calculated PTFs were based on PSD measured by laser diffraction method (LDM) and by pipette method (PM) for estimating KS. Saturated hydraulic conductivity (KSPM) was calculated by pipette methods (PM), while KSLDM was calculated by LDM, using PTFs. Results: The results observed that lower clay fraction measured by LDM than that measured by the PM, while higher silt fraction measured by LDM than that measured by PM. In spite of, there is no agreement between the PSD obtained by LDM and PM. However, it didn't change soil type texture. The root mean square error (RMSE) of KSLDM (2.41×10?6 m sec?1) was relatively close to RMSE of KSPM (2.63×10?6 m sec?1). Conclusion: LDM technique can be successfully used for estimating soil hydraulic properties using PTFs, without any modification or recalculations for silty loam and silty clay loam soils under study.
机译：背景与目的：粒度分布（PSD）是Pedotransfer函数（PTF）中使用的主要预测变量。 PTF的验证需要专门的数据库。这些数据库包含使用移液器或比重计法通过沉降法测量的PSD。近年来，激光衍射法（LDM）被广泛用于粒度分布测量。该研究的目的是验证使用激光衍射法代替移液管法利用PTF估算土壤饱和导水率的方法。材料与方法：采用恒压头法测定土壤饱和导水率，并采用PTFs计算。计算出的PTF基于通过激光衍射法（LDM）和移液器法（PM）测量的PSD估计KS。饱和水力传导率（KSPM）通过移液器方法（PM）计算，而KSLDM通过LDM使用PTF计算。结果：结果观察到，用LDM测得的粘土含量比用PM测得的要低，而用LDM测得的泥沙含量要比用PM测得的高。尽管如此，LDM和PM获得的PSD之间没有协议。但是，它并没有改变土壤类型的质地。 KSLDM的均方根误差（RMSE）（2.41×10 ？6 m sec ？1 ）相对接近KSPM的RMSE（2.63×10 ？ 6 m sec ？1 ）。结论：LDM技术可以成功地用于使用PTF估算土壤水力特性，而无需对正在研究的粉质壤土和粉质粘土壤土进行任何修改或重新计算。

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