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

Elisa Soana*, Mariachiara Naldi, Stefano Bonaglia, Erica Racchetti, Giuseppe Castaldelli, Volker Brüchert, Pierluigi Viaroli, Marco Bartoli

*Kontaktforfatter for dette arbejde

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

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.

OriginalsprogEngelsk
TidsskriftBiogeochemistry
Vol/bind124
Udgave nummer1-3
Sider (fra-til)387-404
Antal sider18
ISSN0168-2563
DOI
StatusUdgivet - 10. maj 2015
Udgivet eksterntJa

Fingeraftryk

Denitrification
macrophyte
Metabolism
Biological materials
meadow
denitrification
Nitrogen
metabolism
organic matter
nitrogen
Nitrification
nitrification
rhizosphere
Sediments
Eutrophication
Water
Nitrates
sediment
Plasticity
plasticity

Citer dette

Soana, E., Naldi, M., Bonaglia, S., Racchetti, E., Castaldelli, G., Brüchert, V., ... Bartoli, M. (2015). Benthic nitrogen metabolism in a macrophyte meadow (Vallisneria spiralis L.) under increasing sedimentary organic matter loads. Biogeochemistry, 124(1-3), 387-404. https://doi.org/10.1007/s10533-015-0104-5
Soana, Elisa ; Naldi, Mariachiara ; Bonaglia, Stefano ; Racchetti, Erica ; Castaldelli, Giuseppe ; Brüchert, Volker ; Viaroli, Pierluigi ; Bartoli, Marco. / Benthic nitrogen metabolism in a macrophyte meadow (Vallisneria spiralis L.) under increasing sedimentary organic matter loads. I: Biogeochemistry. 2015 ; Bind 124, Nr. 1-3. s. 387-404.
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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.",
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Soana, E, Naldi, M, Bonaglia, S, Racchetti, E, Castaldelli, G, Brüchert, V, Viaroli, P & Bartoli, M 2015, 'Benthic nitrogen metabolism in a macrophyte meadow (Vallisneria spiralis L.) under increasing sedimentary organic matter loads', Biogeochemistry, bind 124, nr. 1-3, s. 387-404. https://doi.org/10.1007/s10533-015-0104-5

Benthic nitrogen metabolism in a macrophyte meadow (Vallisneria spiralis L.) under increasing sedimentary organic matter loads. / Soana, Elisa; Naldi, Mariachiara; Bonaglia, Stefano; Racchetti, Erica; Castaldelli, Giuseppe; Brüchert, Volker; Viaroli, Pierluigi; Bartoli, Marco.

I: Biogeochemistry, Bind 124, Nr. 1-3, 10.05.2015, s. 387-404.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Benthic nitrogen metabolism in a macrophyte meadow (Vallisneria spiralis L.) under increasing sedimentary organic matter loads

AU - Soana, Elisa

AU - Naldi, Mariachiara

AU - Bonaglia, Stefano

AU - Racchetti, Erica

AU - Castaldelli, Giuseppe

AU - Brüchert, Volker

AU - Viaroli, Pierluigi

AU - Bartoli, Marco

PY - 2015/5/10

Y1 - 2015/5/10

N2 - 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.

AB - 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.

KW - Denitrification

KW - N fluxes

KW - N uptake

KW - Organic enrichment

KW - Radial oxygen loss

KW - Vallisneria spiralis

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U2 - 10.1007/s10533-015-0104-5

DO - 10.1007/s10533-015-0104-5

M3 - Journal article

AN - SCOPUS:84930272786

VL - 124

SP - 387

EP - 404

JO - Biogeochemistry

JF - Biogeochemistry

SN - 0168-2563

IS - 1-3

ER -