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

Nuclear Research Center of Cadarache, DB/SRA, 13108 Saint-Paul-lez-Durance Cedex, France

N. El Mourabit

INRA 79 Sidi Mohamed ben Abdallah Bvd, Tanger, Morocco

*Corresponding author.

ABSTRACT

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, ) 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() pairs, gave correlation coefficient of 0.90 for this soil layer. The K variation coefficient between 32 and 40% 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.

Received for publication August 11, 1987.