Regulators of heterotrophic microbial potentials in wetland soils

D’Angelo, Elisa M.; Reddy, K. R.

doi:10.1016/s0038-0717(98)00181-3

Cited by 133 publications

(50 citation statements)

References 67 publications

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“…This occurred despite evidence that the dominant microbial process was strongly controlled by incubation site (Table 2). These results agree with those of D'Angelo and Reddy (1999) who found no significant effect of the dominant TEA process on organic carbon mineralization rates.…”

Section: Role Of Electron Acceptorssupporting

confidence: 93%

“…Similarly, mineralization of barley and diatom particles under sulfate-reducing conditions was greater than, or equal to, mineralization under denitrifying conditions (Kristensen and Holmer, 2001). D'Angelo and Reddy (1999) reported no differences in carbon mineralization in wetland soil incubations as TEA pathways changed. Yet, other studies suggest that the free energy yield of TEAs does influence mineralization rates in anaerobic environments.…”

Section: Role Of Electron Acceptorsmentioning

confidence: 98%

“…Among studies that have manipulated the TEA pathway through substrate amendments, some report greater rates of carbon mineralization in the presence of NO 3 À compared to methanogenesis (Pallud et al, 2007;Abell et al, 2009) or SO 4 2À compared to methanogenesis (Reddy and Graetz, 1988;Weston et al, 2006;Pallud et al, 2007). However, in a comparison of 10 different wetland soils, D'Angelo and Reddy (1999) did not observe a difference in organic carbon mineralization rates under denitrifying, sulfate-reducing or methanogenic conditions. One possible explanation for this apparent discrepancy is that the importance of TEAs in determining overall anaerobic mineralization is mediated by electron donor availability (e.g., organic carbon quality).…”

Section: Introductionmentioning

confidence: 94%

“…Concomitantly, sea level rise will also influence the supply of specific TEAs, such as SO 4 2À , with uncertain effects on mineralization. It is already well established that the availability of TEAs affects the last (terminal) step of anaerobic decomposition (Capone and Kiene, 1988;Reddy and D'Angelo, 1994;D'Angelo and Reddy, 1999;Megonigal et al, 2004) by acting through interspecific competition for electron donors (acetate and H 2 ). Indeed, previous work has demonstrated that sea level rise can lead to a shift of electron flow from methanogens to the competitively superior sulfate reducers (Neubauer et al, 2005;Weston et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Electron donors and acceptors influence anaerobic soil organic matter mineralization in tidal marshes

Sutton‐Grier

Keller

Koch

et al. 2011

Soil Biology and Biochemistry

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Section: Role Of Electron Acceptorssupporting

confidence: 93%

Section: Role Of Electron Acceptorsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Electron donors and acceptors influence anaerobic soil organic matter mineralization in tidal marshes

Sutton‐Grier

Keller

Koch

et al. 2011

Soil Biology and Biochemistry

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“…Wetland soil properties that influence spatial patterns in denitrifying bacterial communities are pH, redox potential, temperature, soil texture, labile organic carbon, and nitrogen (D'Angelo and Reddy, 1999;Hill and Cardaci, 2002;Bruland and Table 6 Sample mean, statistical groupings and maximum measured denitrification potential for specific depths and hydrologic zones in the wetland (n = 12). Richardson, 2006;Burchell et al, 2007;Hernandez and Mitsch, 2007).…”

Section: Denitrification In Wetlandsmentioning

confidence: 99%

Fate of nitrate in seepage from a restored wetland receiving agricultural tailwater

Brauer

Maynard

Dahlgren

et al. 2015

Ecological Engineering

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A B S T R A C TConstructed and restored wetlands are a common practice to filter agricultural runoff, which often contains high levels of pollutants, including nitrate. Seepage waters from wetlands have potential to contaminate groundwater. This study used soil and water monitoring and hydrologic and nitrogen mass balances to document the fate and transport of nitrate in seepage and surface waters from a restored flow-through wetland adjacent to the San Joaquin River, California. A 39% reduction in NO 3 -N concentration was observed between wetland surface water inflows (12.87 AE 6.43 mg L À1 ; mean AE SD) and outflows (7.87 AE 4.69 mg L À1 ). Redox potentials were consistently below the nitrate reduction threshold ($250 mV) at most sites throughout the irrigation season. In the upper 10 cm of the main flowpath, denitrification potential (DNP) for soil incubations significantly increased from 151 to 2437 mg NO 3 -N m À2 d À1 when nitrate was added, but showed no response to carbon additions indicating that denitrification was primarily limited by nitrate. Approximately 72% of the water entering the wetland became deep seepage, water that percolated beyond 1-m depth. The wetland was highly effective at removing nitrate (3866 kg NO 3 -N) with an estimated 75% NO 3 -N removal efficiency calculated from a combined water and nitrate mass balance. The mass balance results were consistent with estimates of NO 3 -N removed (5085 kg NO 3 -N) via denitrification potential. Results indicate that allowing seepage from wetlands does not necessarily pose an appreciable risk for groundwater nitrate contamination and seepage can facilitate greater nitrate removal via denitrification in soil compared to surface water transport alone.

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