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A Cumulative Mass Coordinate to Determine Water Profile Changes in Variable Volume Soil¹

ABSTRACT

A method for calculating changes in soil water of variable volume soil using a cumulative mass coordinate is demonstrated. Water content on a mass basis is plotted against mass per unit area of soil solids rather than against depth, lines are fitted, and changes in soil water in zones of gain or loss are calculated from areas between lines. A second method is presented that assesses the need for the cumulative mass coordinate by demonstrating its relation to profile depth. Application of the methods is demonstrated through a worked example using field data taken from an experiment on a Typic Pellustert (Australia).

¹ Contribution from CSIRO, Australia.

² Research Scientist, CSIRO Division of Soils, Cunningham Laboratory, 306 Carmody Road, St. Lucia, Qld. 4067, Australia, and Experimental Scientist, CSIRO Division of Mathematics and Statistics, G.P.O. Box 1965, Canberra, A.C.T., 2601, Australia, (now with Bureau of Mineral Resources, G.P.O. Box 378, Canberra City, A.C.T. 2601, Australia), respectively.

Received for publication January 21, 1986.