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Comparison of Redox Indicators in a Paddy Soil during Rice-Growing Season

^a Hydrology Program, Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616
^b Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616

View larger version (49K): [in a new window]   Fig. 1. A hierarchical scheme for the diagnosis of dominant terminal electron-accepting processes (TEAPs) in ground water system (Chapelle et al., 1995).

View larger version (43K): [in a new window]   Fig. 2. Piezometer installation and expected water flow directions while sampling soil pore waters.

View larger version (18K): [in a new window]   Fig. 3. Changes of parameters vs. pumping water volume for a piezometer installed at 10-cm depth.

View larger version (38K): [in a new window]   Fig. 4. Changes of redox parameters in soil pore water during the rice-growing season for three field plots.

View larger version (23K): [in a new window]   Fig. 5. The changes of EC in soil pore-water during the rice-growing season.

View larger version (21K): [in a new window]   Fig. 6. Corresponding redox potential to selective hypothetical redox couple ratio at equilibrium conditions.

View larger version (65K): [in a new window]   Fig. 7. Relationship among the redox species with pH and EH observed.

View larger version (33K): [in a new window]   Fig. 8. Correlation between measured redox potential and redox species.

View larger version (21K): [in a new window]   Fig. 9. Correlation between measured redox potential and oxidative capacity.