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TEMPORAL PERSISTENCE IN VERTICAL DISTRIBUTIONS OF SOIL MOISTURE CONTENTS

^a USDA-ARS Environmental Microbial Safety Laboratory, Beltsville, MD 20705
^b SCK•CEN, Boeretang 200, 2400 Mol, Belgium

View larger version (61K): [in a new window]   Fig. 1. Time domain reflectometry (TDR) probe locations and numbering. Filled rectangles show Ap, C1, and C2 horizons top to bottom. Dashed lines show the average position of the horizon boundary, and white bands show the observed range of horizon boundary depths. Average values of clay, silt, and sand content are given for the probe installation depths.

View larger version (30K): [in a new window]   Fig. 2. Time series of time domain reflectometry (TDR)–measured water contents at the 15-cm depth (a–d) and precipitation (e) during the period when all probes worked at this depth. Probe numbers top to bottom: (a) 2, 3, 1; (b) 5, 6, 4; (c) 7, 8, 9; and (d) 11, 12, 10. Probe numbering is shown in Fig. 1.

View larger version (43K): [in a new window]   Fig. 3. Simulated effect of the correction for temporal persistence on the relationship between actual and estimated layer-average water contents at the 15-cm depth. Number of probes removed: (a, b) from one to eight; (c, d) from one to four; (e, f) from one to two. Average water content over remaining probes before (a, c, e) and after (b, d, f) the correction application. Values of R2 are the determination coefficients and RSMD is the root-mean square differences of the linear regression actual vs. estimated average water contents.

View larger version (30K): [in a new window]   Fig. 4. Saturated soil water content measured at the adjacent site along the 30-m-long transect at three depths (adapted from Mallants et al., 1996).