Boundary Location from Texture, Soil Moisture, and Infiltration Data
1986
Hendrickx, J. M. H. | Wierenga, P. J. | Nash, M. S. | Nielsen, D. R.
The objective was to ascertain how well different soil physical properties or parameters could be used to identify boundary locations along a soil transect. A transect was established with 91 positions, 1 m apart. The infiltration rate was measured along the transect with small (0.3-m diam) and large (1.0-m diam) infiltration rings. Thereafter, 91 soil samples were taken at a depth of 0.3 m for texture analysis. Also, 91 neutron access tubes and tensiometers were installed in two parallel lines 0.3 m apart. Soil-water content was measured 16 times at the 0.3-m depth before and after flooding the transect. Soil-water tension was measured 13 times after flooding. The moving split window technique was used as a numerical procedure for boundary location. Boundaries detected—based on soil texture, water content, and water tension data—nearly coincided. Under dry conditions, one set of water content measurements resulted in almost the same boundaries as detected with soil texture data. Under moist conditions, several sets of measurements were needed to detect boundaries. Boundary detection with infiltration data was less satisfactory. Window width had little effect on detection of boundaries. The moving split window technique appears to be a useful tool for establishing boundaries along transects, based on water content and tension data, or in combination with soil texture data.
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