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Soil Science Society of America Journal Abstract -

Measuring the Spatial Variability of Soil Hydraulic Conductivity Using an Automatic Neutron Moisture Gauge


This article in SSSAJ

  1. Vol. 52 No. 6, p. 1521-1526
    Received: Aug 11, 1987

    * Corresponding author(s):
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  1. P. Moutonnet ,
  2. E. Pluyette,
  3. P. Couchat and
  4. N. El Mourabit
  1. Nuclear Research Center of Cadarache, DB/SRA, 13108 Saint-Paul-lez-Durance Cedex, France
    INRA 79 Sidi Mohamed ben Abdallah Bvd, Tanger, Morocco



Soil internal drainage was measured along a 100-m transect with 20 neutron probe access tubes at 5-m intervals using an automatic neutron moisture gauge and a tensiometer data logger. Geostatistical analysis of the measurement results (in terms of hydraulic conductivity, K, vs. water content, θ) at depths of 60 and 90 cm, showed no autocorrelation among the sites. Measurement results related to depths of 120 and 150 cm were deleted because of the lack of a unit hydraulic gradient. Variance analysis indicated that the 60- and 90-cm layers values could be considered together as a unique soil layer. The exponential regression equation computed from 240 K(θ) pairs, gave correlation coefficient of 0.90 for this soil layer. The K variation coefficient between 32 and 40% θ was 75% for the 60- and 90-cm soil depths. This value is consistent with other published findings.

Contribution from the Atomic Energy Committee, Dep. of Biology, Radio-Agronomy Serv.

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