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Temporal changes and spatial variation of soil oxygen consumption, nitrification and denitrification rates in a tidal salt marsh of the Lagoon of Venice, Italy

Eriksson, Peder (author)
Lund University,Lunds universitet,Biologiska institutionen,Naturvetenskapliga fakulteten,Department of Biology,Faculty of Science
Svensson, J.M. (author)
Högskolan i Halmstad,Våtmarkscentrum
Carrer, M. (author)
Dipto. Proc. Chimici dell'Ingegneria, Université di Padova, Padua, Italy
 (creator_code:org_t)
Elsevier, 2003
2003
English.
In: Estuarine, Coastal and Shelf Science. - : Elsevier. - 0272-7714 .- 1096-0015. ; 58:4, s. 861-871
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The aim of the present study was to investigate seasonal and spatial patterns of soil oxygen consumption, nitrification, denitrification and fluxes of dissolved inorganic nitrogen (DIN) in a tidal salt marsh of the Lagoon of Venice, Italy. In the salt marsh, intact soil cores including overlying water were collected monthly at high tide from April to October in salt marsh creeks and in areas covered by the dominant vegetation, Limonium serotinum. In May, cores were also collected in areas with vegetation dominated by Juncus maritimus and Halimione portulacoides. In laboratory incubations at in situ temperature in the dark, flux rates of oxygen and DIN were monitored in the overlying water of the intact cores. 15N-nitrate was added to the overlying water and nitrification and denitrification were measured using isotope-dilution and -pairing techniques. The results show that highest soil oxygen consumption coincided with the highest water temperature in June and July. The highest denitrification rates were recorded in spring and autumn coinciding with the highest nitrate concentrations. Soil oxygen consumption and nitrification rates differed between sampling sites, but denitrification rates were similar among the different vegetation types. The highest rates were recorded in areas covered with L. serotinum. Burrowing soil macrofauna enhanced oxygen consumption, nitrification and denitrification in April and May. The data presented in this study indicate high temporal as well as spatial variations in the flux of oxygen and DIN, and nitrogen transformations in the tidal salt marshes of the Venice lagoon during the growth season. The results identify the salt marshes of the Venice lagoon as being metabolically very active ecosystems with a high capacity to process nitrogen.

Subject headings

NATURVETENSKAP  -- Biologi -- Ekologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences -- Ecology (hsv//eng)
NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)

Keyword

isotope-technique
vegetation
macrophyte
nitrogen
limonium
juncus
halimione
Freshwater ecology
Limnisk ekologi
macrophyte
isotope-technique
vegetation
Halimione
Limonium
nitrogen
Juncus

Publication and Content Type

ref (subject category)
art (subject category)

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By the author/editor
Eriksson, Peder
Svensson, J.M.
Carrer, M.
About the subject
NATURAL SCIENCES
NATURAL SCIENCES
and Biological Scien ...
and Ecology
NATURAL SCIENCES
NATURAL SCIENCES
and Earth and Relate ...
and Environmental Sc ...
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Estuarine, Coast ...
By the university
Halmstad University
Lund University

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