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- W2018332692 abstract "The capacity of riparian soils to remove nitrate (NO3) from ground water is well established, but the effects of ground water NO3(-)-enrichment on C dynamics are not well studied. We incubated horizontal cores of aquifer material extracted from beneath moderately well-drained (MWD) and poorly drained (PD) soils in a riparian forest in Rhode Island, USA for 132 d, and dosed (flow rate, 170 mL d(-1); dissolved O2, 2 in PD and 5 mg L(-1) in MWD cores) with ground water amended with either Br-, Br(-)+ NO3- (10 mg N L(-1)), or Br(-) + NO3(-) + DOC (20 mg C L(-1)). The DOC was extracted from forest floor material and added during the first 56 d of the experiment. Addition of NO3- had limited effect on CO2 production while DOC amendment had a significant effect in the PD but not in the MWD mesocosms. Total CO2 production (mg CO2-C kg(-1) soil) was 6.3, 7.0, and 10.1 in the PD and 3.6, 4.0, and 4.5 in the MWD cores amended with Br-, Br(-) + NO3-, and Br(-) + NO3(-) + DOC, respectively. Carbon balance (C(bal) = DOC(in) - (DOC(out) + CO2-C) showed a net C retention of 8.0 mg C kg(-1) soil in the DOC-amended MWD cores (equivalent to 50% of the DOC added), and a net C loss of 8.3 mg C kg(-1) soil in similarly treated PD cores. The lack of C retention in the PD cores was ascribed to reductive dissolution of minerals implicated in DOC sorption. These findings underscore that there is marked variation in C dynamics in riparian aquifers that has the potential to influence the fate of NO3- and DOC in the landscape." @default.
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- W2018332692 date "2003-07-01" @default.
- W2018332692 modified "2023-10-18" @default.
- W2018332692 title "Dissolved Organic Carbon Dynamics in a Riparian Aquifer" @default.
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- W2018332692 doi "https://doi.org/10.2134/jeq2003.1365" @default.
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