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10377. Pierson, F.B. and D.J. Mulla. 1990. Aggregate stability in the Palouse region of Washington: effect of landscape position.. Soil Sci. Soc. Amer. J. 54:1407-1412.
Spatial patterns of aggregate stability were studied in the steeply rolling Palouse hills. Aggregate stability and organic C content were highest in footslope and toeslope positions, and lowest at the summit. Clay content was just the opposite. Aggregate stability patterns were closely related to changes in a few key properties, namely, organic C content and landscape position. Soil erosion had removed topsoil and organic matter from the ridgetops, thus exposing subsoil horizons which are higher in clay content and lower in aggregate stability.