Movement of bacteria in unsaturated soil columns with macropores.
Rapid movement of bacteria through the soil has been observed after applications of manure to agricultural fields.
Preferential flow through macropores has been suggested as the main reasons for these observations.
Experiments with repacked soil columns were used to study the effect of artificially created macropores, soil type, soil water content, and simulated rain application on movement of a tracer bacterium, nalidixic acid-resistant Escherichia coli.
Results form these experiments showed a significant increase in the number of biotracer cells passing through a soil column when macropores were present and the soil was wet.
There was no passage of biotracer cells through a dry soil with macropore No biotracer cells were eluted from columns without macropores even when the soils were wet.
Simulated rainfall applied on the top of the soil columns caused bacteria to travel deeper into the soil.
These results confirm the important role that macropores play in the movement of bacteria through heterogenous soils.
Mots-clés Pascal : Macroporosité, Phénomène transport, Pluie, Translocation, Bactérie, Indicateur biologique, Traceur, Escherichia coli, Enterobacteriaceae, Pore, Colonne sol, Sol non saturé, Etude expérimentale, Simulation physique, Bactériologie, Contamination biologique, Environnement, Pollution sol, Milieu poreux, TRANSPORT DANS LE SOL, BIOLOGIE DU SOL
Mots-clés Pascal anglais : Macroporosity, Transport process, Rain, Translocation, Bacteria, Biological indicator, Tracers, Escherichia coli, Enterobacteriaceae, Pore, Soil column, Unsaturated soil, Experimental study, Physical simulation, Bacteriology, Biological contamination, Environment, Soil pollution, Porous medium, SOIL TRANSPORT PROCESSES, SOIL BIOLOGY
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0024237
Code Inist : 001D16D03. Création : 31/05/1999.