Effect of Measurement Scales on Measured Soil Hydraulic Properties and Their Spatial Variability
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    Abstract:

    A field experiment was conducted to study the spatial variability and scale dependence of soil hydraulic properties. Infiltrometers with three disc diameters (14. 4,20,and 30 cm)and 2 tensions(1 and 10 cm)were used to measure infiltration at 65 locations. With the infiltration data,hydraulic conductivity and macroscopic capillary length were calculated. The frequency distribution of hydraulic conductivity and macroscopic capillary length was log-normal. The spatial continuity of soil hydraulic conductivity and macroscopic capillary length was better displayed by measurements with large disc sizes. When tension was 1cm and disc diameter was 14. 4 cm,the spatial structure of hydraulic conductivity was not displayed. The mean of hydraulic conductivity and macroscopic capillary length tended to decrease as measurement scale (disc sizes)increased. The values of nuggets and sills of the sample variograms of hydraulic conductivity and macroscopic capillary length decreased as measurement scale increased.

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薛绪掌,张仁铎,桂胜祥.测定尺度对所测土壤导水参数及其空间变异性的影响[J].水土保持通报英文版,2001,(3):47-50

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History
  • Received:January 15,2001
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  • Online: November 28,2014
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