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Dissolved Organic Carbon Dynamics in a Riparian Aquifer

Effects of Hydrology and Nitrate Enrichment

^a School of Natural Resources, 2021 Coffey Road, 210 Kottman Hall, Ohio State Univ., Columbus, OH 43210
^b Inst. of Ecosystem Studies, Millbrook, NY 12545
^c Dep. of Natural Resources Science, Univ. of Rhode Island, Kingston, RI 02881

View larger version (14K): [in a new window]   Fig. 1. Schematic representation of the mesocosm dosing setup.

View larger version (30K): [in a new window]   Fig. 2. Carbon dioxide (CO3) production in poorly drained (PD) and moderately well-drained (MWD) mesocosms as affected by soil drainage class, nitrate (NO-3), and dissolved organic C (DOC) addition. Vertical bars represent standard deviation of the mean (n = 6 to 27 observations).

View larger version (14K): [in a new window]   Fig. 3. Relationships between carbon dioxide (CO2) production and dissolved organic carbon (DOC) in mesocosm effluent.

View larger version (22K): [in a new window]   Fig. 4. Degradation rate constants (d-1) of dissolved organic carbon (DOC) and concentration of DOC (right scale) in extracts obtained through suspension in ground water (soil/water ratio 1:3) of forest floor materials taken from poorly drained (PD) and moderately well-drained (MWD) sections of the riparian forest. The DOC extracts were amended with NH4 (0.5 mg NH4-N L-1) and incubated aerobically in the dark for 14 d.

View larger version (42K): [in a new window]   Fig. 5. Dissolved organic carbon (DOC) concentrations in the inflow and outflow of poorly drained (PD) and moderately well-drained (MWD) mesocosms. Vertical bars represent standard deviation of the mean (n = 6 to 27 observations).

View larger version (42K): [in a new window]   Fig. 6. Sulfate (SO2-4) concentrations in the inflow and outflow of poorly drained (PD) and moderately well-drained (MWD) mesocosms. Vertical bars represent standard deviation of the mean (n = 6 to 27 observations).