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Published online 21 June 2006
Published in Soil Sci Soc Am J 70:1272-1280 (2006)
DOI: 10.2136/sssaj2005.0291
© 2006 Soil Science Society of America
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Hydraulic Conductivity, Immobile Water Content, and Exchange Coefficient in Three Soil Profiles

L. Allettoa, Y. Coquetb,*, P. Vachierb and C. Labatb

a Ecole Supérieure d'Agriculture de Purpan–75, voie du TOEC BP 57 611, 31 076 Toulouse Cedex 3, France
b UMR INRA/INAPG Environment and Arable Crops, Institut National de la Recherche Agronomique/Institut National Agronomique Paris-Grignon, BP 01, 78 850 Thiverval-Grignon, France


Figure 1
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  		Fig. 1. Resident concentration of the four anionic tracers (Br–, pentafluorobenzoate [PFBA], 2,6-diflurobenzoate [DFBA], and trifluoromethylbenzoate [TFBA]) at the end of experiment in surface layers (a) LA1, (b) LA2, and (c) LA3. Depth is relative to the infiltration surface, which was located 3 cm below the actual soil surface.

 

Figure 2
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  		Fig. 2. Normalized resident concentrations (C is the mean resident solution concentration and C0 is the input concentration) of each tracer vs. application time for all experiments. In each graph, points with the same symbol correspond to the same experiment (four tracers). Linear regression lines are shown for each experiment.

 

Figure 3
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  		Fig. 3. Mass exchange coefficient values ({alpha}) and immobile water fraction ({theta}im/{theta}) as a function of depth in (a and b) Plot 1, (c and d) Plot 2, and (e and f) Plot 3. Measured values are shown as open circles and error bars represent 95% confidence limits of the mean values.

 

Figure 4
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  		Fig. 4. Relationships between (a) the immobile volumetric water content and the total volumetric water content and (b) the logarithm of the mass exchange coefficient ({alpha}, h–1) and the logarithm of the average pore water velocity (v, cm h–1).

 




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