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Calibrating Hydric Soil Field Indicators to Long-Term Wetland Hydrology

^a Dep. of Soil Science, Box 7619, North Carolina State Univ., Raleigh, NC 27695
^b Dep. of Biological and Agricultural Engineering, Box 7625, North Carolina State Univ., Raleigh, NC 27695

View larger version (17K): [in a new window]   Fig. 1. Plan view of the site showing plot location in relation to soil boundaries.

View larger version (16K): [in a new window]   Fig. 2. Landscape cross-sections showing slope configurations of each transect. Plots in the depression of the north transect contained hydric soil field indicators, while in the south transect only plot 5S contained a field indicator.

View larger version (31K): [in a new window]   Fig. 3. Variation in redox potential over time for Plot 5N. The difference between the time saturation began and the start of Fe-reduction is termed a lag period for Fe reduction.

View larger version (20K): [in a new window]   Fig. 4. Relationships between saturation events and percentages of (A) redox depletions and (B) redox concentrations during the growing season. Data from all plots at the site were used for analysis.

View larger version (24K): [in a new window]   Fig. 5. Relationship between percentage of redox depletions and saturation events for the 15- and 30-cm depths. Lines were drawn using equations in Table 6 for the growing season. It was assumed that 2% redox concentrations occurred at both depths and remained constant while percentages of redox depletions varied. Wetland hydrology would be met for saturation events of 0.5 event yr–1 or above which correspond to a soil having approximately 30% depletions between the depths of 15 and 30 cm.