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Rhizosphere Iron (III) Deposition and Reduction in a Juncus effusus L.-Dominated Wetland

^a George Mason Univ., Fairfax, VA 22030, Present address: U.S. Geological Survey, Reston, VA 20142
^b American Type Culture Collection, Manassas, VA 20110
^c Smithsonian Environmental Research Center, Edgewater, MD 21037-0028

View larger version (17K): [in a new window]   Fig. 1. Physical and chemical characteristics of a Juncus-dominated wetland. Each data point in Panels A through C is the average of six duplicate readings along the transect, two at each end and in the middle. Measurements were taken at the standing water surface (SURFACE), at the water–soil interface (DEPTH), and in the pore water (where applicable).

View larger version (14K): [in a new window]   Fig. 2. Changes in root and soil biomass during anaerobic decomposition. All data points represent the average of five harvested bags ± 1 standard error. The m0 is the initial biomass and the m is biomass at each time point.

View larger version (28K): [in a new window]   Fig. 3. Changes in Fe fractions during anaerobic decomposition. All columns represent the average total Fe of five buried bags collected at each time interval ±1 standard error.

View larger version (17K): [in a new window]   Fig. 4. Fe(III) reduction of root and soil Fe pools during anaerobic incubation. The Fe measured at each data point was converted to mg Fe and then multiplied by the percentage of Fe(III) at each harvest time to obtain the ratio of Fe(III)t to Fe(III)0. Error bars represent ±1 standard error.

View larger version (64K): [in a new window]   Fig. 5. Changes in Fe bacteria during anaerobic decomposition. All columns represent the average number of FeOB or FeRB of five bags collected at each harvest ±1 standard error.