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Schlangen, Isabell; Löscher, Carolin Regina; Attard, Karl Michael; Sørensen, Lisbeth Fürst; Riemann, Lasse (2025): The effect of sediment resuspension on pelagic nitrogen fixation in a Danish fjord - Core incubations [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.983171

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Published: 2025-11-18 • DOI registered: 2025-12-17

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Abstract:
This dataset contains results from incubation experiments investigating the impact of sediment resuspension on nitrogen (N₂) fixation in a microtidal fjord environment. Experiments were conducted seasonally during June, July, August, and September 2023 using water and sediment from Kærby Fed in Odense Fjord, Denmark. The aim was to evaluate whether varying intensities of resuspension affect pelagic N₂ fixation activity. Measured parameters include: (i) N₂ fixation rates, determined using the 15N₂ tracer method following Mohr et al. (2010), (ii) particulate organic carbon (POC) and particulate organic nitrogen (PON) content of the added sediment, analyzed by Elemental Analysis–Isotope Ratio Mass Spectrometry, (iii) concentrations of dissolved inorganic nitrogen (DIN) and phosphorus (DIP) in the overlying water, measured using a spectrophotometer. Incubations involved sediment slurries subjected to different resuspension intensities, simulating a range of bed-shear stress conditions. All treatments were conducted in triplicates, and the dataset includes standard deviations for replicate measurements. The data support assessments of how sediment-driven processes influence microbial nitrogen cycling in coastal zones of the Danish Baltic Sea.
Keyword(s):
Coastal dynamics; diazotrophs; nitrogen cycling; nitrogen fixation; Resuspension; seasonal fluctuations
Supplement to:
Schlangen, Isabell; Riemann, Lasse; Attard, Karl Michael; Löscher, Carolin Regina (2025): The effect of sediment resuspension on pelagic nitrogen fixation in a Danish Fjord. Estuarine, Coastal and Shelf Science, 327, 109566, https://doi.org/10.1016/j.ecss.2025.109566
Related to:
Schlangen, Isabell; Löscher, Carolin Regina; Attard, Karl Michael; Sørensen, Lisbeth Fürst; Riemann, Lasse (2025): The effect of sediment resuspension on pelagic nitrogen fixation in a Danish fjord - Sediment characteristics [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.983163
References:
Großkopf, Tobias; Mohr, Wiebke; Baustian, Tina; Schunck, Harald; Gill, Diana; Kuypers, Marcel MM; Lavik, Gaute; Schmitz, Ruth A; Wallace, Douglas WR; LaRoche, Julie (2012): Doubling of marine dinitrogen-fixation rates based on direct measurements. Nature, 488, 361-364, https://doi.org/10.1038/nature11338
Mohr, Wiebke; Großkopf, Tobias; Wallace, Douglas WR; LaRoche, Julie (2010): Methodological Underestimation of Oceanic Nitrogen Fixation Rates. PLoS ONE, 5(9), e12583, https://doi.org/10.1371/journal.pone.0012583
Montoya, Joseph P; Voss, Maren; Kähler, Paul; Capone, D G (1996): A Simple, High-Precision, High-Sensitivity Tracer Assay for N2 Fixation. Applied and Environmental Microbiology, 62(3), 986-993, https://doi.org/10.1128/aem.62.3.986-993.1996
Funding:
Independent Research Fund Denmark (DFF), grant/award no. DFF-0217-00089B: Biogeochemical cycling and nitrogen fixation in Danish coastal regions
Coverage:
Latitude: 55.452444 * Longitude: 10.492889
Date/Time Start: 2023-06-19T00:00:00 * Date/Time End: 2023-09-05T00:00:00
Event(s):
Odense_Fjord_core_2023 * Latitude: 55.452444 * Longitude: 10.492889 * Date/Time Start: 2023-06-19T00:00:00 * Date/Time End: 2023-09-05T00:00:00 * Location: Kærby Fed, Odense Fjord, Denmark * Method/Device: Sediment corer (SEDCO)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Type of studyStudy typeSchlangen, Isabell
2 Location of eventLocationSchlangen, Isabell
3 Latitude of eventLatitudeSchlangen, Isabell
4 Longitude of eventLongitudeSchlangen, Isabell
5 Sampling date/time, experimentDate/time sampling expSchlangen, Isabell
6 MonthMonthSchlangen, Isabell
7 Experimental treatmentExp treatSchlangen, IsabellIncubation of sediment core, in situAddition of water or sediment (slurry)
8 Number of measurementsn#Schlangen, Isabell
9 Treatment: sedimentT:sedimentgSchlangen, IsabellAddition of marine sedimentAmount of added sediment (slurry)
10 Treatment: sediment, standard deviationT:sediment std dev±Schlangen, IsabellCalculatedAmount of added sediment (slurry)
11 Nitrogen fixation rateN2 fixnmol/l/daySchlangen, IsabellAccording to Montoya et al. (1996), modified after Mohr et al. (2010) and Großkopf et al. 2012)
12 Nitrogen fixation rate, standard deviationN2 fix std dev±Schlangen, IsabellCalculated
13 Nitrogen, inorganic, dissolvedDINµmol/lSchlangen, IsabellSpectrophotometer UV/VIS, Thermo Fisher Scientific, Genesys 10
14 Nitrogen, inorganic, dissolved, standard deviationDIN std dev±Schlangen, IsabellCalculated
15 Phosphorus, inorganic, dissolvedDIPµmol/lSchlangen, IsabellSpectrophotometer UV/VIS, Thermo Fisher Scientific, Genesys 10
16 Phosphorus, inorganic, dissolved, standard deviationDIP std dev±Schlangen, IsabellCalculated
17 Nitrogen, organic, particulatePONµmol/lSchlangen, IsabellElemental Analysis - Isotope Ratio Mass Spectrometry (EA-IRMS), Thermo Fisher Scientific, EA IsoLink CN - ConFlo IV - Delta V Plus
18 Nitrogen, organic, particulate, standard deviationPON std dev±Schlangen, IsabellCalculated
19 Carbon, organic, particulatePOCµmol/lSchlangen, IsabellElemental Analysis - Isotope Ratio Mass Spectrometry (EA-IRMS), Thermo Fisher Scientific, EA IsoLink CN - ConFlo IV - Delta V Plus
20 Carbon, organic, particulate, standard deviationPOC std dev±Schlangen, IsabellCalculated
21 Carbon/Nitrogen ratioC/NSchlangen, IsabellElemental analyzer, Thermo Scientific, Flash EA 1112; coupled with an isotope ratio mass spectrometer, Thermo Fisher, Finnigan Delta Plus XP
22 Carbon/Nitrogen ratio, standard deviationC/N std dev±Schlangen, IsabellCalculated
23 Nitrogen, inorganic, dissolvedDINµmol/lSchlangen, IsabellSpectrophotometer UV/VIS, Thermo Fisher Scientific, Genesys 10Overlying water (not incubated)
24 Nitrogen, inorganic, dissolved, standard deviationDIN std dev±Schlangen, IsabellCalculatedOverlying water (not incubated)
25 Phosphorus, inorganic, dissolvedDIPµmol/lSchlangen, IsabellSpectrophotometer UV/VIS, Thermo Fisher Scientific, Genesys 10Overlying water (not incubated)
26 Phosphorus, inorganic, dissolved, standard deviationDIP std dev±Schlangen, IsabellCalculatedOverlying water (not incubated)
27 Nitrogen, inorganic, dissolved/Phosphorus, inorganic, dissolved ratioDIN/DIPSchlangen, IsabellCalculatedOverlying water (not incubated)
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
248 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Study type		2 
Location		3 
Latitude		4 
Longitude		5 
Date/time sampling exp		6 
Month		7 
Exp treat
(Addition of water or sediment...)		8 
n [#]		9 
T:sediment [g]
(Amount of added sediment (slu...)		10 
T:sediment std dev [±]
(Amount of added sediment (slu...)		11 
N2 fix [nmol/l/day]
(According to Montoya et al. (...)		12 
N2 fix std dev [±]
(Calculated)		13 
DIN [µmol/l]
(Spectrophotometer UV/VIS, The...)		14 
DIN std dev [±]
(Calculated)		15 
DIP [µmol/l]
(Spectrophotometer UV/VIS, The...)		16 
DIP std dev [±]
(Calculated)		17 
PON [µmol/l]
(Elemental Analysis - Isotope ...)		18 
PON std dev [±]
(Calculated)		19 
POC [µmol/l]
(Elemental Analysis - Isotope ...)		20 
POC std dev [±]
(Calculated)		21 
C/N
(Elemental analyzer, Thermo Sc...)		22 
C/N std dev [±]
(Calculated)		23 
DIN [µmol/l]
(Overlying water (not incubate...)		24 
DIN std dev [±]
(Overlying water (not incubate...)		25 
DIP [µmol/l]
(Overlying water (not incubate...)		26 
DIP std dev [±]
(Overlying water (not incubate...)		27 
DIN/DIP
(Overlying water (not incubate...)
Field experimentKærby Fed, Odense Fjord, Denmark55.45244410.4928892023-06-19JuneWater30.0000.0000.3780.0880.5460.0841.3340.09517.5692.496102.5542.5325.8370.8200.7430.0101.4100.0050.527
Field experimentKærby Fed, Odense Fjord, Denmark55.45244410.4928892023-06-19JuneSlurry130.6520.0210.1610.0120.4690.0551.3960.35026.1503.282140.9758.6425.3910.760
Field experimentKærby Fed, Odense Fjord, Denmark55.45244410.4928892023-06-19JuneSlurry239.3330.4020.0500.0360.3570.0751.3330.152131.26138.003215.35922.3031.6410.540
Field experimentKærby Fed, Odense Fjord, Denmark55.45244410.4928892023-07-25JulyWater30.0000.0001.8470.2150.9440.1472.3810.37820.6501.49424.2701.3211.1750.1070.9440.0472.0390.0140.463
Field experimentKærby Fed, Odense Fjord, Denmark55.45244410.4928892023-07-25JulySlurry130.6740.0282.3120.4721.0200.2332.4100.23027.0501.91031.5582.2281.1670.116
Field experimentKærby Fed, Odense Fjord, Denmark55.45244410.4928892023-07-25JulySlurry2310.2340.2363.1111.5970.9220.1132.4150.30267.5026.437134.98513.7332.0000.279
Field experimentKærby Fed, Odense Fjord, Denmark55.45244410.4928892023-08-07AugustWater30.0000.0001.2390.0962.4350.3800.4750.11325.5733.08428.8123.3091.1270.1942.2990.2810.3220.0097.137
Field experimentKærby Fed, Odense Fjord, Denmark55.45244410.4928892023-08-07AugustSlurry130.6810.0661.0260.0643.2170.4520.3900.03226.2734.69331.8215.5361.2110.291
Field experimentKærby Fed, Odense Fjord, Denmark55.45244410.4928892023-08-07AugustSlurry239.7940.7061.1420.1032.4940.4380.4490.16995.20412.941180.46318.4261.8960.341
Field experimentKærby Fed, Odense Fjord, Denmark55.45244410.4928892023-09-05SeptemberWater30.0000.0000.7430.1212.8760.2421.2510.33012.0151.03014.0181.2011.1670.1413.0190.1111.2340.0072.447
Field experimentKærby Fed, Odense Fjord, Denmark55.45244410.4928892023-09-05SeptemberSlurry130.6860.0530.4610.1032.6980.4751.1670.12020.0037.35719.1181.7600.9560.442
Field experimentKærby Fed, Odense Fjord, Denmark55.45244410.4928892023-09-05SeptemberSlurry239.8880.0830.6800.1652.5190.2790.9080.09280.06322.336123.68231.0131.5450.683