Original Articles

The relationship between soil morphology and soil water regime: preliminary results in the Weatherley catchment

Published in: South African Journal of Plant and Soil
Volume 21, issue 4, 2004 , pages: 240–244
DOI: 10.1080/02571862.2004.10635056
Author(s): C.W. van HuyssteenDepartment of Soil, Crop and Climate Sciences, Republic of South Africa, P., A.L. le RouxDepartment of Soil, Crop and Climate Sciences, Republic of South Africa, M. HensleyDepartment of Soil, Crop and Climate Sciences, Republic of South Africa

Abstract

Soil water contents were measured for five years at Weatherley, an intensively instrumented catchment in the north eastern part of the Eastern Cape Province. Soil water contents are expressed in terms of average duration of saturation with water above 0.7 of porosity (ADS>07 in days per year) and is related to soil morphology. Preliminary results indicate that different orthic A horizons can have ADS>0.7 from 3 to 356 days per year, depending on the nature of the underlying horizons. The E and soft plinthic B horizons in the Longlands profile had ADS>0.7 of 21 and 92 days per year, respectively. In the Kroonstad profile ADS>0.7 is 351 days in the E and 330 days per year in the G horizon. The red apedal B in the Bloemdal profile had ADS>0.7. = 0, while the underlying unspecified material with signs of wetness had ADS>0.7 of 203 days per year. Initial indications are that ADS>0.7 less than 10 days per year does not lead to mottling, while ADS>0.7 larger than 13 days per year results in mottling.

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