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Coupled Microbial and Transport Processes in Soils

M. L. Rockhold*,a, R. R. Yarwoodb and J. S. Selkerc

a Pacific Northwest National Lab., P.O. Box 999/MS K9-36, Richland, WA 99352
b Dep. of Crop and Soil Sciences, Oregon State Univ., Corvallis, OR 97331
c Dep. of Bioengineering, Oregon State Univ., Corvallis, OR 97331


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  		Fig. 1. Effective diffusion coefficients for O2 in the gas phase of a sand porous medium as a function of aqueous-phase saturation for different values of the respiration quotient, r.

 


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  		Fig. 2. Effective diffusion coefficients for O2 in the aqueous and gas phases of a sand porous medium as a function of aqueous-phase saturation.

 


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  		Fig. 3. Conceptual model of possible sorption sites for bacterial cells in variably saturated porous media and corresponding rate coefficients.

 


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  		Fig. 4. Gas–liquid interfacial surface area per bulk volume of a 40/50 grade of quartz sand as a function of effective aqueous-phase saturation, calculated using the Brooks–Corey water retention model with n = 0.332, {lambda}bc = 8.85, hb = 26.5 cm, {rho} = 0.993 g cm–3, g = 981 cm s–2, and {sigma} = 72.8 mN m–1.

 




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 2004 by the Soil Science Society of America.