Biogeochemistry

, Volume 111, Issue 1–3, pp 647–660 | Cite as

Nitrate removal in two relict oxbow urban wetlands: a 15N mass-balance approach

  • Melanie D. Harrison
  • Peter M. Groffman
  • Paul M. Mayer
  • Sujay S. Kaushal
Article

Abstract

A 15N-tracer method was used to quantify nitrogen (N) removal processes in two relict oxbow wetlands located adjacent to the Minebank Run restored stream reach in Baltimore County (Maryland, USA) during summer 2009 and early spring 2010. A mass-balance approach was used to directly determine the flow of 15NO3 to plants, algae, and sediments, with unaccounted for 15N assumed to be denitrified. During the summer, plant and algal uptake accounted for 42%, of the added 15NO3 in oxbow 1, less than 1% remained in the water column and 57% was unaccounted for. In oxbow 2 during the summer, plant and algal uptake accounted for 63% of the added 15NO3 , with <1% remaining in the water column and 38% unaccounted for. During the early spring, plant and algal uptake were much lower in both oxbows, ranging from 0.05 to 13.3% of the 15N added, with 97 and 87% was unaccounted for in oxbow 1 and 2, respectively. The amount of unaccounted for 15N was equivalent to estimated areal denitrification rates of 12 and 6 mg N m−2 d−1 in the summer and 78 and 15 mg N m−2 d−1 in the spring, in oxbow 1 and oxbow 2, respectively. However, the uncertainty of these estimates is high as it was difficult to detect accumulation of 15N in the sediments which could have accounted for a very large percentage of the added 15N. Our results suggest that the two relict oxbow wetlands are sinks for NO3 during both summer and spring but that the pathways of removal vary with plants and algae playing a major role in summer but not in spring.

Keywords

Algae Denitrification Macrophytes Nitrogen Sediment 

Notes

Acknowledgments

This research was supported by grants from the U.S. Environmental Protection Agency (CR829676), the U.S. National Science Foundation (NSF) Long-Term Ecological Research program (DEB-0423476), the NSF Integrative Graduate Education and Research Traineeship Program (0549469), the NSF Division of Biological Infrastructure (DBI 06-40300), Maryland Sea Grant award (SA7528085-U), and the NOAA Educational Partnership Graduate Science Program (GSP). We thank Dan Dillon, Dave Lewis, Lisa Martel, Robin Schmidt, Daniel Jones, and Emma Noonan for assistance with field and laboratory work, and Andrew Miller and Christopher Swan for thoughtful comments and review of the manuscript. The research has not been subjected to EPA review and therefore does not necessarily reflect the views of any of the funding agencies, and no official endorsement should be inferred.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Melanie D. Harrison
    • 1
    • 5
  • Peter M. Groffman
    • 2
  • Paul M. Mayer
    • 3
  • Sujay S. Kaushal
    • 4
  1. 1.Marine Estuarine and Environmental Science ProgramUniversity of Maryland Baltimore CountyBaltimoreUSA
  2. 2.Cary Institute of Ecosystem StudiesNew YorkUSA
  3. 3.National Risk Management Research Lab, Ground Water and Ecosystems Restoration DivisionUS Environmental Protection AgencyOklahomaUSA
  4. 4.Department of Geology and Earth Systems Science Interdisciplinary CenterUniversity of MarylandCollege ParkUSA
  5. 5.Southwest Region, Protected Resources DivisionNational Oceanic and Atmospheric AdministrationSanta RosaUSA

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