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Hydraulic Properties of a Desert Soil Chronosequence in the Mojave Desert, USA

M. H. Younga,*, E. V. McDonaldb, T. G. Caldwellb, S. G. Bennera,d and D. G. Meadowsa,c

a Desert Research Institute, Univ. and Community College System of Nevada, Las Vegas, NV 89119
b Desert Research Institute, Univ. and Community College System of Nevada, Reno, NV 89512
c Currently, Hydrologic Sciences Program, Univ. of Nevada, Reno, NV 89532
d Currently, Dep. of Geosciences, Boise State Univ., Boise, ID 83725


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  		Fig. 1. Conceptual diagram showing how the soil surfaces age with time. Qf indicates Quaternary fluvial deposits, ka indicates thousands of years old, Av indicates vesicular A horizon, Bw indicates a B horizon with some color or structural development, Bt indicates a B horizon with clay accumulation, and C horizon indicates material that has little pedogenic development. Note that Av horizon was not present on the younger surfaces (Qf7, Qf8).

 


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  		Fig. 2. Ternary diagram showing evolution of soil texture with time. Data points contained in circles refer to samples taken from the Av horizon, when that feature was present. Arrow points in direction of increasing soil age.

 


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  		Fig. 3. Comparison between Wooding's Ksw vs. van Genuchten's Ksvg, which was determined by inverse modeling. Symbols are data, and the line is the 1:1 line.

 


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  		Fig. 4. Results of analysis for (A) Ksw and (B) {alpha}w for different surface designations (x axis label) and soil layers (letter designations above error bars). Error bars represent standard deviations.

 


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  		Fig. 5. Plot showing the relationship between soil surface age and mean Ksw for soils ranging in designation from Qf8 (young) to Qf3 (old). Solid line is linear regression, and dashed line is predictive error (95% confidence).

 


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  		Fig. 6. (A) Sodium and (B) water content profiles for soils of different ages, taken 4 d after a 3.9-cm precipitation event. Soil ages are included in the legend for clarity.

 


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  		Fig. 7. Soil water storage measured in upper 50 cm of soil profile 4 d following a 3.9-cm precipitation event.

 




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