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A Time Domain Reflectometry Method to Measure Immobile Water Content and Mass Exchange Coefficient

^a Dep. of Agronomy, Iowa State Univ., Ames, IA 50011 USA
^b USDA-ARS, National Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011 USA

View larger version (38K): [in a new window]   Fig. 1 Schematic diagram of time domain reflectometry (TDR) setup. A two-wire type 8-cm-long probe was diagonally installed in the surface 2-cm layer of the each soil column

View larger version (17K): [in a new window]   Fig. 2 (a) The relative resident concentrations obtained from TDR are plotted as ln(1 - C/Co) vs. t*, and the regression lines are fitted to the data using Eq. [3]. (b) The resident concentrations are plotted as ln(1 - C/Co) vs. t*, and the regression lines are fitted to the data using Eq. [3]. The data are obtained from surface 2-cm soil extracts sampled after applying a series of three different fluorobenzoate tracers

View larger version (25K): [in a new window]   Fig. 3 (a) Flux-averaged concentration BTCs of the three different tracers for Column C. (b) The BTCs are adjusted so that t = 0 when each tracer is first applied to Column C