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Temporal Stability of Spatially Measured Soil Matric Potential Probability Density Function

^a USDA-ARS Plant Stress and Water Conservation Lab., Big Spring Field Station, 302 W I-20, Big Spring, TX 79720
^b Dep. of Soil and Water Science, Univ. of Arizona, 429 Shantz Bldg. 38, Tucson, AZ 85721

View larger version (49K): [in a new window]   Fig. 1. Diagram of the field used for the study showing location numbers. Instrumentation was placed at the center of each plot. Solid lines in the center of the diagram represent irrigation system manifolds, and the dashed lines through plots 94 through 96 represent subsurface trickle irrigation lines that ran through each plot

View larger version (21K): [in a new window]   Fig. 2. Ranked intertemporal relative difference from the spatial mean water storage. Means are represented by blocks, and the associated intertemporal standard deviations are represented by vertical bars. Numbers refer to measurement locations

View larger version (29K): [in a new window]   Fig. 3. Cumulative probability function of m for the day of the lowest spatial mean m (5/09) and the first day of measurement in the same irrigation cycle (4/30) for measurements representing the average across the three depths of measurement. Numbers refer to measurement locations

View larger version (39K): [in a new window]   Fig. 4. Ranked intertemporal relative difference from the spatial mean m for measurements representing the average across the three depths of measurement. Means are represented by blocks, and the associated intertemporal standard deviations are represented by vertical bars. Numbers refer to measurement locations

View larger version (25K): [in a new window]   Fig. 5. Comparison of soil water release characteristic curves from the 0.3-m depth at Locations 12 and 63 showing the different shapes and intercepts of the curves and the different volumes of water release between the limits shown. Of particular interest are the different ranges of m over which each curve exhibits maximum water release

View larger version (27K): [in a new window]   Fig. 6. Time behavior of measured m at selected field locations representing three mean estimators (5, 26, and 93) and two estimators of the extrema (35 and 62) for measurements representing the average across the three depths of measurement