The Effects of Salinity on Nitrogen Losses from an Oligohaline Estuarine Sediment

Anne E. Giblin, Nathaniel B. Weston, Gary Thomas Banta, Jane Tucker, Charles S. Hopkinson

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Benthic respiration, sediment–water nutrient
fluxes, denitrification and dissimilatory nitrate reduction to
ammonium (DNRA) were measured in the upper section
of the Parker River Estuary from 1993 to 2006. This site
experiences large changes in salinity over both short and
long time scales. Sediment respiration ranged from 6
to 52 mmol m−2 day−1 and was largely controlled by
temperature. Nutrient fluxes were dominated by ammonium
fluxes, which ranged from a small uptake of −0.3 to an
efflux of over 8.2 mmol N m−2 day−1. Ammonium fluxes
were most highly correlated with salinity and laboratory
experiments demonstrated that ammonium fluxes increased
when salinity increased. The seasonal pattern of DNRA
closely followed salinity. DNRA rates were extremely low
in March, less than 0.1 mmol m−2 day−1, but increased to
2.0 mmol m−2 day−1 in August. In contrast, denitrification
rates were inversely related to salinity, ranging from 1 mmol
m−2 day−1 during the spring and fall to less than 0.2 mmol
m−2 day−1 in late summer. Salinity appears to exert a major
control on the nitrogen cycle at this site, and partially
decouples sediment ammonium fluxes from organic matter
decomposition.
OriginalsprogEngelsk
TidsskriftEstuaries and Coasts
Vol/bind33
Udgave nummer5
Sider (fra-til)1054-1068
Antal sider15
ISSN1559-2723
DOI
StatusUdgivet - 2010

Citer dette

Giblin, Anne E. ; Weston, Nathaniel B. ; Banta, Gary Thomas ; Tucker, Jane ; Hopkinson, Charles S. / The Effects of Salinity on Nitrogen Losses from an Oligohaline Estuarine Sediment. I: Estuaries and Coasts. 2010 ; Bind 33, Nr. 5. s. 1054-1068.
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title = "The Effects of Salinity on Nitrogen Losses from an Oligohaline Estuarine Sediment",
abstract = "Benthic respiration, sediment–water nutrientfluxes, denitrification and dissimilatory nitrate reduction toammonium (DNRA) were measured in the upper sectionof the Parker River Estuary from 1993 to 2006. This siteexperiences large changes in salinity over both short andlong time scales. Sediment respiration ranged from 6to 52 mmol m−2 day−1 and was largely controlled bytemperature. Nutrient fluxes were dominated by ammoniumfluxes, which ranged from a small uptake of −0.3 to anefflux of over 8.2 mmol N m−2 day−1. Ammonium fluxeswere most highly correlated with salinity and laboratoryexperiments demonstrated that ammonium fluxes increasedwhen salinity increased. The seasonal pattern of DNRAclosely followed salinity. DNRA rates were extremely lowin March, less than 0.1 mmol m−2 day−1, but increased to2.0 mmol m−2 day−1 in August. In contrast, denitrificationrates were inversely related to salinity, ranging from 1 mmolm−2 day−1 during the spring and fall to less than 0.2 mmolm−2 day−1 in late summer. Salinity appears to exert a majorcontrol on the nitrogen cycle at this site, and partiallydecouples sediment ammonium fluxes from organic matterdecomposition.",
keywords = "Benthic respiration , Benthic fluxes , Salinity, Ammonium, Denitrification, Dissimilatory nitrate reduction to ammonium (DNRA), Estuary, Sediments",
author = "Giblin, {Anne E.} and Weston, {Nathaniel B.} and Banta, {Gary Thomas} and Jane Tucker and Hopkinson, {Charles S.}",
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The Effects of Salinity on Nitrogen Losses from an Oligohaline Estuarine Sediment. / Giblin, Anne E.; Weston, Nathaniel B.; Banta, Gary Thomas; Tucker, Jane; Hopkinson, Charles S.

I: Estuaries and Coasts, Bind 33, Nr. 5, 2010, s. 1054-1068.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - The Effects of Salinity on Nitrogen Losses from an Oligohaline Estuarine Sediment

AU - Giblin, Anne E.

AU - Weston, Nathaniel B.

AU - Banta, Gary Thomas

AU - Tucker, Jane

AU - Hopkinson, Charles S.

PY - 2010

Y1 - 2010

N2 - Benthic respiration, sediment–water nutrientfluxes, denitrification and dissimilatory nitrate reduction toammonium (DNRA) were measured in the upper sectionof the Parker River Estuary from 1993 to 2006. This siteexperiences large changes in salinity over both short andlong time scales. Sediment respiration ranged from 6to 52 mmol m−2 day−1 and was largely controlled bytemperature. Nutrient fluxes were dominated by ammoniumfluxes, which ranged from a small uptake of −0.3 to anefflux of over 8.2 mmol N m−2 day−1. Ammonium fluxeswere most highly correlated with salinity and laboratoryexperiments demonstrated that ammonium fluxes increasedwhen salinity increased. The seasonal pattern of DNRAclosely followed salinity. DNRA rates were extremely lowin March, less than 0.1 mmol m−2 day−1, but increased to2.0 mmol m−2 day−1 in August. In contrast, denitrificationrates were inversely related to salinity, ranging from 1 mmolm−2 day−1 during the spring and fall to less than 0.2 mmolm−2 day−1 in late summer. Salinity appears to exert a majorcontrol on the nitrogen cycle at this site, and partiallydecouples sediment ammonium fluxes from organic matterdecomposition.

AB - Benthic respiration, sediment–water nutrientfluxes, denitrification and dissimilatory nitrate reduction toammonium (DNRA) were measured in the upper sectionof the Parker River Estuary from 1993 to 2006. This siteexperiences large changes in salinity over both short andlong time scales. Sediment respiration ranged from 6to 52 mmol m−2 day−1 and was largely controlled bytemperature. Nutrient fluxes were dominated by ammoniumfluxes, which ranged from a small uptake of −0.3 to anefflux of over 8.2 mmol N m−2 day−1. Ammonium fluxeswere most highly correlated with salinity and laboratoryexperiments demonstrated that ammonium fluxes increasedwhen salinity increased. The seasonal pattern of DNRAclosely followed salinity. DNRA rates were extremely lowin March, less than 0.1 mmol m−2 day−1, but increased to2.0 mmol m−2 day−1 in August. In contrast, denitrificationrates were inversely related to salinity, ranging from 1 mmolm−2 day−1 during the spring and fall to less than 0.2 mmolm−2 day−1 in late summer. Salinity appears to exert a majorcontrol on the nitrogen cycle at this site, and partiallydecouples sediment ammonium fluxes from organic matterdecomposition.

KW - Benthic respiration

KW - Benthic fluxes

KW - Salinity

KW - Ammonium

KW - Denitrification

KW - Dissimilatory nitrate reduction to ammonium (DNRA)

KW - Estuary

KW - Sediments

U2 - 10.1007/s12237-010-9280-7

DO - 10.1007/s12237-010-9280-7

M3 - Journal article

VL - 33

SP - 1054

EP - 1068

JO - Estuaries and Coasts

JF - Estuaries and Coasts

SN - 1559-2723

IS - 5

ER -