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The High Water-Holding Capacity of Petrocalcic Horizons

^a USDA-ARS, Jornada Experimental Range, Las Cruces, NM 88003-8003
^b Dep. of Plant and Environmental Sciences, New Mexico State Univ., Las Cruces, NM 88003-8003

View larger version (77K): [in this window] [in a new window]   Fig. 1. Samples were collected from two locations in the Chihuahuan Desert (Schmidt, 1979) near Las Cruces, NM.

View larger version (141K): [in this window] [in a new window]   Fig. 2. Site 2 sampling trench showing laminar and plugged zones.

View larger version (18K): [in this window] [in a new window]   Fig. 3. Measured points and fitted van Genuchten (1980) equation lines of soil-water potential as a function of gravimetric water content in testing soil-water release curve method repeatability before oven drying (closed circles, solid line) and after oven drying (open circles, dotted line).

View larger version (26K): [in this window] [in a new window]   Fig. 4. Measured and average fitted values of all samples for Sites 1 (left) and 2 (right) and laminar (top) and plugged (bottom) zones.

View larger version (27K): [in this window] [in a new window]   Fig. 5. Average fitted curves from Sites 1 and 2, laminar and plugged zones plotted against a calcic horizon curve (Baumhardt and Lascano, 1993) and pectrocalcic material curve (Hennessy et al. (1983). Ranges plotted represent the range of soil water potential measured in each study.

View larger version (27K): [in this window] [in a new window]   Fig. 6. (a) Volumetric water retained by two morphologies of petrocalcic horizon at field capacity (FC) and two wilting points (–1.5 MPa and –4.0 MPa) and (b) available water holding capacity (AWHC) based on –1.5 MPa and –4.0 MPa. Fisher's protected LSD ( = 0.05) within measurement by letters, error bars represent sample standard deviations.