HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (9) Citing Articles via Google Scholar Google Scholar Articles by Köhne, J. M. Articles by Köhne, S. Search for Related Content PubMed Articles by Köhne, J. M. Articles by Köhne, S. GeoRef GeoRef Citation Agricola Articles by Köhne, J. M. Articles by Köhne, S. Related Collections Structure and Properties Soil Physics Vadose Zone Processes and Chemical Transport

Effective Diffusion Coefficients of Soil Aggregates with Surface Skins

^a Texas A&M University, Dep. of Biological & Agricultural Engineering 201 Scoates Hall, 2117 TAMU, College Station, TX 77843-2117
^b Centre for Agricultural Landscape and Land Use Research, Dep. of Soil Landscape Research, Eberswalder Str. 84, D-15374 Müncheberg, Germany
^c 1912 Vinewood, Bryan, TX 77802

View larger version (27K): [in a new window]   Fig. 1. Geometry of the imaginary diffusion experiment of Crank (1975).

View larger version (89K): [in a new window]   Fig. 2. Schematic drawing (top view and cross-section view) of the apparatus for measurement of salt tracer diffusion out of a well-stirred solution into water-saturated soil aggregates. The numbers beside the plugs indicate the sequence of tracer application through the respective holes in the lid.

View larger version (28K): [in a new window]   Fig. 3. Normalized anion mass in the solution during diffusion into 21 soil aggregates without (removed) and with skin (intact), and results of fitting F in an analytical diffusion equation (Eq. [5]) to data of aggregates without (dashed line) and with (solid line) surface. (a) Br-, (b) Cl-.

View larger version (20K): [in a new window]   Fig. 4. Temporal change of normalized anion mass M/M0 in the stirred free solution versus time during the diffusion experiment with surface skins-removed aggregates (data), numerical forward simulation (num.-samp) compared with analytical fitting (Eq. [5]) results, and numerical forward simulation not corrected (num.) for sampling, (a) Br-, (b) Cl-.

View larger version (18K): [in a new window]   Fig. 5. Temporal change of normalized anion mass M/M0 in the free solution during the diffusion experiment with intact aggregates (data), numerical calibration corrected (num.-samp) and not corrected (num.) for sampling, respectively, (a) Br-, (b) Cl-.