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Biogeochemistry

, Volume 124, Issue 1–3, pp 387–404 | Cite as

Benthic nitrogen metabolism in a macrophyte meadow (Vallisneria spiralis L.) under increasing sedimentary organic matter loads

  • Elisa SoanaEmail author
  • Mariachiara Naldi
  • Stefano Bonaglia
  • Erica Racchetti
  • Giuseppe Castaldelli
  • Volker Brüchert
  • Pierluigi Viaroli
  • Marco Bartoli
Article

Abstract

Organic enrichment may deeply affect benthic nitrogen (N) cycling in macrophyte meadows, either promoting N loss or its recycling. This depends upon the plasticity of plants and of the associated microbial communities, as those surrounding the rhizosphere. Rates of denitrification, dissolved inorganic N fluxes and N uptake were measured in sediments vegetated by the submerged macrophyte Vallisneria spiralis L. under increasing organic matter loads. The aim was to investigate how the combined N assimilation and denitrification, which subtract N via temporary retention and permanent removal, respectively, do vary along the gradient. Results showed that V. spiralis meadows act as regulators of benthic N cycling even in organic enriched sediments, with negative feedbacks for eutrophication. A moderate organic load stimulates N uptake and denitrification coupled to nitrification in the rhizosphere. This is due to a combination of weakened competition between macrophytes and N cycling bacteria and enhanced radial oxygen loss by roots. An elevated organic enrichment affects N uptake due to hostile conditions in pore water and plant stress and impairs N mineralisation and its removal via denitrification coupled to nitrification. However, the loss of plant performance is almost completely compensated by increased denitrification of water column nitrate, resulting in a shift between the relative relevance of temporary and permanent N removal processes.

Keywords

Organic enrichment Vallisneria spiralis Radial oxygen loss N fluxes Denitrification N uptake 

Notes

Acknowledgments

ES was supported by a doctoral scholarship within the 25th PhD program in Ecology (2010–2012), University of Parma. The authors would like to thank Fabio Vincenzi (Department of Life Sciences and Biotechnology, University of Ferrara) for helping with laboratory analyses.

Supplementary material

10533_2015_104_MOESM1_ESM.docx (17 kb)
Supplementary material 1 (DOCX 18 kb)

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Elisa Soana
    • 1
    • 2
    Email author
  • Mariachiara Naldi
    • 2
  • Stefano Bonaglia
    • 3
  • Erica Racchetti
    • 2
  • Giuseppe Castaldelli
    • 1
  • Volker Brüchert
    • 3
  • Pierluigi Viaroli
    • 2
  • Marco Bartoli
    • 2
  1. 1.Department of Life Sciences and BiotechnologyUniversity of FerraraFerraraItaly
  2. 2.Department of Life SciencesUniversity of ParmaParmaItaly
  3. 3.Department of Geological SciencesStockholm UniversityStockholmSweden

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