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This article in SSSAJ

  1. Vol. 26 No. 3, p. 297-300
     
    Received: June 9, 1961


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doi:10.2136/sssaj1962.03615995002600030028x

The Effects of Rainfall Intensity on Soil Structure and Migration of Colloidal Materials in Soils1

  1. A. R. Bertrand and
  2. Kamil Sor2

Abstract

Abstract

This paper presents the effects of rainfall energy on the clay content, specific surface, aggregate stability, and organic matter content of the several layers of three soil types.

After 30 minutes of simulated rainfall at an intensity of 1.6 inches per hour the magnitudes of the above properties of the first layer (0 to 1.5 cm.) decreased considerably, while these properties of the sublayers (1.5 to 12.0 cm.) did not change. After 30 minutes of rainfall at 2.8 and 4.0 inches per hour, the decrease in the magnitudes of these soil properties in the first layer was greater than that occurring under the 1.6 inches per hour rainfall. Thirty minutes of rainfall with intensities of 2.8 and 4.0 inches per hour changed the physical properties of the second layer (1.5 to 3.0 cm.) somewhat, although not of the same magnitude as they were changed in the top layer. The effects of 2.8 and 4.0 inches per hour rainfall were about equal in magnitude, while the effects of 1.6 inches per hour were lower.

Clays labeled with Rb86 migrated in soil profiles during the application of rainfall. About 1% of the clay migrated to a depth of 3 cm. At about 7.5 cm. the radioactivity of the soil was equal to the background.

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