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Dissolution of Phosphate in a Phosphorus-Enriched Ultisol as Affected by Microbial Reduction

Department of Soil Science, Box 7619, North Carolina State University, Raleigh, NC 27695-7619

View larger version (26K): [in a new window]   Fig. 1. Trends in redox potential (Eh), pH, and cumulative evolved CO2(g) over a 40-d anaerobic reduction period for silt + clay suspensions with control, 0-d, and spiked-addition treatments. Arrows denote times of dextrose addition, and error bars represent standard deviations for duplicate reactors.

View larger version (24K): [in a new window]   Fig. 2. Trends in dissolved organic carbon (DOC) and dissolved reactive phosphorus (DRP) over a 40-d anaerobic incubation period for silt + clay suspensions with control, 0-d, and spiked-addition treatments. Included are data for DOC and DRP from an aerobic control experiment for the 0-d treatment. Arrows denote times of dextrose addition, and error bars represent standard deviations for duplicate reactors.

View larger version (27K): [in a new window]   Fig. 3. Trends in dissolved organic carbon (DOC), Fe(II), total Fe (FeT), and total Al (AlT) over a 40-d anaerobic incubation period for silt + clay suspensions with control, 0-d, and spiked-addition treatments. Data for AlT at 26 and 40 d were not obtained due to insufficient sample volume. Included are data for FeT from the aerobic control experiment for the 0-d treatment. Arrows denote times of dextrose addition, and error bars represent standard deviations for duplicate reactors.

View larger version (24K): [in a new window]   Fig. 4. Normalized X-ray absorption near-edge structure (XANES) spectra comparing the pre-edge regions for a silt + clay sample versus standards of PO4 sorbed to ferrihydrite or noncrystalline Al-hydroxide.

View larger version (18K): [in a new window]   Fig. 5. Dissolved reactive phosphorus (DRP), dissolved organic carbon (DOC), total Fe (FeT), and total Al (AlT) as affected by pH for silt + clay suspensions reacted in a batch experiment for 48 h. Error bars represent standard deviations in measurements between duplicate samples.

View larger version (21K): [in a new window]   Fig. 6. Dissolved reactive phosphorus (DRP), total Fe (FeT), and total Al (AlT) as affected by increasing concentration of dissolved organic carbon (DOC) for silt + clay suspensions reacted with different inputs of citrate for 19 h at pH 6.93 ± 0.06. Error bars represent standard deviations in measurements between duplicate samples.