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Oxidation-Reduction Potential of Saturated Forest Soils

ABSTRACT

Large decreases in redox potentials of saturated soil over a 25-day incubation period were favored by high temperature and the addition of sucrose, loblolly pine needles (Pinus taeda L.), or yellow-poplar leaves (Liriodendron tulipifera L.). The addition of a complete nutrient solution had no effect in soils incubated with sucrose, but it reduced the drop in potential in soils incubated with tree litter at 21–27C. The data suggest the need for care when evaluating soil aeration by means of redox potentials and the dominant role of soil microorganisms in activating redox systems.

¹ Silviculturist at the Southern Hardwoods Laboratory, which is maintained at Stoneville, Miss., by the Southern Forest Experiment Station, Forest Service, USDA, in cooperation with the Mississippi Agr. Exp. Sta. and the Southern Hardwood Forest Research Group.

² Professor of Forest Soils, Duke University, Durham, N. C.

Received for publication September 19, 1966. Accepted for publication July 28, 1967.