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Spatial Variability of Field-measured Soil-water Characteristics¹

ABSTRACT

One hundred neutron access pipes were placed 1-m apart along a 100-m transect together with tensiometers located at soil depths of 0.3 and 0.6 m. After ponding the experimental site with water for at least 4 d, the site was allowed to drain and covered with 0.3 m of straw to reduce evaporation. Measurements of soil-water content and soil-water pressure head (h) initially made at 2-h intervals were made less frequently as redistribution proceeded. The (,h|t)—observations were fitted to the five-parameter van Genuchten model. Spatial autocorrelations and cross-correlations of , h, and percentage sand manifested significant coefficients for distances as great as 10 m. The practical significance of this research is that it addresses the impact of the separation distance between a tensiometer and a neutron meter access tube on the precision of the measured soil-water characteristic curve. Greater precision is obtained for separation distances < 10 m.

¹ Contribution from Dep. of Land, Air and Water Resources, University of California, Davis.

² Visiting Research Soil Physicist, Swiss Federal Institute of Technology, Zurich; Research Fellow, Indian Agricultural Research Institute, Dehli, and Professor of Soil and Water Science, Univ. of California, Davis; Davis, CA 95616. This research was supported by the Kearney Foundation of Soil Science.

Received for publication October 12, 1984. Accepted for publication May 9, 1985.

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