Abstract
Changes in redox potential, soil gas composition (O2 and CO2), and oxygen diffusion rate were studied in laboratory soil columns in the presence of different stagnating groundwater tables. Under steady-state moisture conditions, a decrease in O2 content was reflected by an increase in CO2 content. The redox potential was related to the soil pH. The oxygen diffusion rate increased when the water table was lowered. Only at water table depths of more than 50 cm did the oxygen diffusion rate at the 5-cm soil depth exceed the level at which aeration is considered sufficient to sustain vigorous rooth growth. Empirical relations are presented for calculating the aeration profile in soils from water pressure head measurements with tensiometers. Redox potential measurements did not reflect the soil aeration status in oxygen-rich environments.
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