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Comparison of denitrification characteristics among three habitat types of a large river floodplain: Atchafalaya River Basin, Louisiana

  • ATCHAFALAYA RIVER
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Abstract

Mobile forms of nitrogen leach from upland environments into aquatic systems, often discharging to coastal zones. Addition of nitrogen to once N-limited systems results in a host of changes ranging from eutrophication to loss of biodiversity. Floodplains can ameliorate these changes by removing and sequestering nitrogen. In many coastal floodplains, sedimentation causes lakes to transition to baldcypress swamps, and ultimately to bottomland hardwood (BLHW) forests. These habitats differ in their contact with floodwater, which directly and indirectly affects their ability to process nutrients, but the effects of habitat change on denitrification at the floodplain scale cannot be predicted because of lack of suitable data. This study compared denitrification characteristics among the aforementioned habitats within the Atchafalaya River Basin (ARB). Microcosms were established in the laboratory, and the acetylene block technique was used to estimate four denitrification characteristics: background denitrification rates, maximum rates, time to reach maximum rates, and the linear response of denitrification to nitrate concentration. There were significant differences in denitrification characteristics among the three habitat types; specifically, all habitats differed in the time required for denitrification to respond to nitrate in the overlying water, and denitrification in lake habitats differed from both BLHWs and baldcypress swamps. Landscape-scale models should account for different linear relationships between denitrification and nitrate concentrations, and different response times to nitrate concentrations for different habitats. Because denitrification characteristics differ across habitats within the ARB, continued habitat change within the floodplain will alter nutrient discharge to coastal waters.

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Acknowledgements

This study was funded by the Louisiana Board of Regents Research Competitiveness Subprogram. We thank D. Heckman, R. Cleary, V. Tobias, J. Conkle, and H. Brand for their assistance in the field and laboratory.

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Authors and Affiliations

  1. School of Renewable Natural Resources, Louisiana State University Agricultural Center, Louisiana State University, Baton Rouge, LA, 70803, USA

    Amy E. Scaroni & John A. Nyman

  2. School of the Coast and Environment, Louisiana State University, Baton Rouge, LA, 70803, USA

    Charles W. Lindau

Authors
  1. Amy E. Scaroni
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  2. John A. Nyman
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  3. Charles W. Lindau
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Corresponding author

Correspondence to Amy E. Scaroni.

Additional information

Guest editors: M. Ford & J.A. Nyman / Interactions among rivers, floodplains, and coastal areas examined at the Atchafalaya River

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Scaroni, A.E., Nyman, J.A. & Lindau, C.W. Comparison of denitrification characteristics among three habitat types of a large river floodplain: Atchafalaya River Basin, Louisiana. Hydrobiologia 658, 17–25 (2011). https://doi.org/10.1007/s10750-010-0471-9

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  • DOI: https://doi.org/10.1007/s10750-010-0471-9

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