Landscape-Level Estimation of Nitrogen Removal in Coastal Louisiana Wetlands: Potential Sinks under Different Restoration Scenarios

Victor H. Rivera-Monroy; Benjamin Branoff; Ehab Meselhe; Alex McCorquodale; Mark Dortch; Gregory D. Steyer; Jenneke Visser; Hongqing Wang

doi:10.2112/SI_67_6

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1 August 2013 Landscape-Level Estimation of Nitrogen Removal in Coastal Louisiana Wetlands: Potential Sinks under Different Restoration Scenarios

Victor H. Rivera-Monroy, Benjamin Branoff, Ehab Meselhe, Alex McCorquodale, Mark Dortch, Gregory D. Steyer, Jenneke Visser, Hongqing Wang

Author Affiliations +

Victor H. Rivera-Monroy, Benjamin Branoff
Louisiana State University, Department of Oceanography and Coastal Sciences, Baton Rouge, LA 70803, U.S.A., vhrivera@lsu.edu
Ehab Meselhe
The Water Institute of the Gulf, 301 N Main Street, Suite 2000, Baton Rouge, LA 70825, U.S.A.
Alex McCorquodale
University of New Orleans, Pontchartrain Institute for Environmental Sciences, New Orleans, LA 70122, U.S.A.
Mark Dortch
Moffatt & Nichol, 1905B Mission 66, Suite 1, Vicksburg, MS 39180, U.S.A.
Gregory D. Steyer
U.S. Geological Survey, National Wetlands Research Center, c/o Livestock Show Office, Parker Coliseum, Louisiana State University, Baton Rouge, LA 70803, U.S.A.
Jenneke Visser
University of Louisiana-Lafayette, Institute for Coastal Ecology and Engineering,, Lafayette, LA 70504, U.S.A.
Hongqing Wang
U.S. Geological Survey, National Wetlands Research Center, c/o Livestock Show Office, Parker Coliseum, Louisiana State University, Baton Rouge, LA 70803, U.S.A.

J. of Coastal Research (JCR), 67(sp1):75-87 (2013). https://doi.org/10.2112/SI_67_6

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Abstract

Rivera-Monroy, V.H.; Branoff, B.; Meselhe, E.; McCorquodale, A.; Dortch, M.; Steyer, G.D.; Visser, J., and Wang, H., 2013. Landscape-level estimation of nitrogen removal in coastal Louisiana wetlands: potential sinks under different restoration scenarios.Coastal eutrophication in the northern Gulf of Mexico (GOM) is the primary anthropogenic contributor to the largest zone of hypoxic bottom waters in North America. Although biologically mediated processes such as denitrification (Dn) are known to act as sinks for inorganic nitrogen, it is unknown what contribution denitrification makes to landscape-scale nitrogen budgets along the coast. As the State of Louisiana plans the implementation of a 2012 Coastal Master Plan (MP) to help restore its wetlands and protect its coast, it is critical to understand what effect potential restoration projects may have in altering nutrient budgets. As part of the MP, a spatial statistical approach was developed to estimate nitrogen removal under varying scenarios of future conditions and coastal restoration project implementation. In every scenario of future conditions under which MP implementation was modeled, more nitrogen () was removed from coastal waters when compared with conditions under which no action is taken. Overall, the MP increased coast-wide average nitrogen removal capacity (NRC) rates by up to 0.55 g N m−2 y−1 compared with the “future without action” (FWOA) scenario, resulting in a conservative estimate of up to 25% removal of the annual load of the Mississippi-Atchafalaya rivers (956,480 t y−1). These results are spatially correlated, with the lower Mississippi River and Chenier Plain exhibiting the greatest change in NRC. Since the implementation of the MP can maintain, and in some regions increase the NRC, our results show the need to preserve the functionality of wetland habitats and use this ecosystem service (i.e. Dn) to decrease eutrophication of the GOM.

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Victor H. Rivera-Monroy, Benjamin Branoff, Ehab Meselhe, Alex McCorquodale, Mark Dortch, Gregory D. Steyer, Jenneke Visser and Hongqing Wang "Landscape-Level Estimation of Nitrogen Removal in Coastal Louisiana Wetlands: Potential Sinks under Different Restoration Scenarios," Journal of Coastal Research (JCR) 67(sp1), (1 August 2013). https://doi.org/10.2112/SI_67_6

Received: 16 November 2012; Accepted: 4 February 2013; Published: 1 August 2013

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coastal modeling

denitrification

hypoxia

Louisiana

Mississippi River

nitrogen uptake

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"Landscape-Level Estimation of Nitrogen Removal in Coastal Louisiana Wetlands: Potential Sinks under Different Restoration Scenarios," 67(sp1)
Victor H. Rivera-Monroy, Benjamin Branoff, Ehab Meselhe, Alex McCorquodale, Mark Dortch, Gregory D. Steyer, Jenneke Visser, Hongqing Wang
Journal of Coastal Research (JCR) (1 August 2013)

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