Hydrologic responses of compacted forest soils
1991
Gardner, B.D. | Chong, S.K.
Soil cores were constructed in the laboratory under different antecedent moisture content, theta, and degrees of compaction. Sorptivity, So, effective hydraulic conductivity, Ke, and the Boltzmann constant, lambda, were measured using the unsaturated sorptivity device. Subsequently, the bulk density, BD, and degree of saturation, S, were also determined. S, and Ke were found to be log-linearly and inversely related to BD at same level of theta. lambda was also inversely proportional to BD but in a linear fashion. The study found unexpectedly low values of Se, Ke, and lambda at theta. Cores with theta and BD also had relatively low S indicating a large degree of water unfillable porosity. This unfillable porosity was mostly attributable to entrapped air which caused the unexpected results. The results show that soil hydrologic properties such as So are sensitive to currently unpredictable factors such as entrapped air. An example application where measured soil hydrologic properties are used to estimate the variation in runoff potential for different portions of a logging skid trail is included.
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