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Biogeochemistry

, Volume 121, Issue 3, pp 565–580 | Cite as

Stable isotopic evidence of enhanced export of microbially derived \({\text{NO}}_{3}^{ - }\) following active layer slope disturbance in the Canadian High Arctic

  • Nicole L. LouiseizeEmail author
  • Melissa J. Lafrenière
  • Meredith G. Hastings
Article

Abstract

Permafrost disturbance is expected to alter nitrogen (N) export in High Arctic watersheds by enhancing loads of dissolved inorganic N (DIN), particularly nitrate (\({\text{NO}}_{3}^{ - }\)), by enabling nitrification and/or the mobilization of N previously sequestered in deeper permafrost soils. Using chemical, isotopic, and hydrologic measurements, we compare the seasonal evolution of concentrations and sources of \({\text{NO}}_{3}^{ - }\) in a stream draining an undisturbed catchment with one that drains a catchment that has been affected by active layer detachments (ALDs) at the Cape Bounty Arctic Watershed Observatory (74°54′N, 109°35′W) on Melville Island, Nunavut. Oxygen stable isotope values of \({\text{NO}}_{3}^{ - }\)18O-\({\text{NO}}_{3}^{ - }\)) from streamwater indicate that \({\text{NO}}_{3}^{ - }\) in runoff predominantly originated from atmospheric sources in both catchments only during the first days of melt. In the undisturbed catchment, low \({\text{NO}}_{3}^{ - }\) concentrations and elevated streamwater δ18O-\({\text{NO}}_{3}^{ - }\) values relative to the disturbed catchment indicate that \({\text{NO}}_{3}^{ - }\) export was suppressed by sink mechanisms. In contrast, low δ18O-\({\text{NO}}_{3}^{ - }\) values and high \({\text{NO}}_{3}^{ - }\) concentrations in runoff from the disturbed catchment indicate that the supply of \({\text{NO}}_{3}^{ - }\) from microbial sources far outweighed sinks in the watershed. This research demonstrates that ALDs enhanced the export of microbially derived \({\text{NO}}_{3}^{ - }\) relative to undisturbed watersheds, and that this is likely a result of limited \({\text{NO}}_{3}^{ - }\) retention and enhanced nitrification in the mineral soils exposed in the scar zones of ALDs.

Keywords

Active layer detachments Atmospheric deposition Denitrification High Arctic Nitrate Nitrification 

Notes

Acknowledgments

This research was funded by the Arctic Net Network of Centres of Excellence of Canada. We also extend our gratitude to the Polar Continental Shelf Program (PCSP), for exceptional logistical support. Valuable field, laboratory, and GIS assistance was provided by K. Rutherford, G. Montross, S. Montross, D Lamhonwah and A. Rudy.

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Nicole L. Louiseize
    • 1
    Email author
  • Melissa J. Lafrenière
    • 1
  • Meredith G. Hastings
    • 2
  1. 1.Department of GeographyQueen’s UniversityKingstonCanada
  2. 2.Department of Geological SciencesBrown UniversityProvidenceUSA

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