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Spatial Dependence of Physical Properties of a Typic Torrifluvent Soil¹

ABSTRACT

The spatial structure of soil properties has been examined on a Typic Torrifluvent soil at The University of Arizona Experiment Station at Marana. Nine hundred samples from nine transects were collected in straight lines (100 locations for each transect), at 20-, 200-, and 2,000-cm intervals. All samples were at a 50-cm depth. Variables include 0.1 and 15 bar water content, available water, surface area, particle size distribution, pH, EC, bulk density, and moisture content in the field seven days after irrigation. Autocorrelation functions were evaluated for each parameter and found to be correlated over space with patterns of three basic types: typical, random, or with a large zone of influence. Generalizations were difficult, but the calculated zone of influence was strongly dependent on distance between samples, with larger intervals tending to give greater values. In a few cases, this could partially be explained on the basis of larger standard deviations measured on longer transects. Results indicate future difficulty in assigning scale lengths by parameter or soil.

¹ Arizona Agric. Exp. Stn., Paper no. 3368. Supported by Western Regional Project W-155.

² Graduate Student, Dep. of Soils, Water, and Engr.; Professor, Dep. of Soils, Water, and Engr.; and Professor, Dep. of Math. Address: University of Arizona, Tucson, AZ 85721.

Received for publication October 8, 1980. Accepted for publication March 30, 1981.

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