Sediment and porewater nitrification and organic matter data in a Northern Gulf of Mexico marsh from 2021-05-26 to 2022-05-21 (NCEI Accession 0301084)

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: January 26, 2026 | Last Modified: 2025-02-05T00:00:00.000+00:00

We conducted a year-long study with the main objective of comparing denitrification, anammox, and dissimilatory nitrate reduction to ammonium (DNRA) across three different vegetation zones (Distichlis spicata, Juncus roemerianus, and Cladium mariscus Spp.) in the salt marsh at Weeks Bay National Estuarine Research Reserve (NERR) in Fairhope, AL., USA. Sediment samples were collected from each vegetation zone to measure rates of denitrification, anammox, and DNRA using a membrane inlet mass spectrometer. Percent nitrate removal was calculated as the product of denitrification plus anammox divided by the sum of all three nitrate reduction processes. Plant biomass and soil carbon and nitrate content were collected to characterize each zone. Nutrient stocks for phosphate, ammonium, nitrate + nitrite, and hydrogen sulfides from each marsh were measured from porewater samples taken from 10 cm depth within each vegetation zone. We also performed a laboratory manipulation where we subjected sediments from each vegetation zone with nitrate and organic matter (Spirulina cyanobacteria) in a full factorial design, giving us four total treatment conditions: control, + nitrate only, + organic matter only, and + nitrate + organic matter. We incubated sediments in anoxic tanks in their respective treatments for 28 days while periodically removing a subset of sediment over five timepoints during the incubation (days 1, 3, 7, 15, and 28). The removed sediments were used to measure denitrification, anammox and DNRA potentials with the objective to see how nitrate and organic matter influence nitrate reduction processes from sediments across the three vegetation types. Overlying water from each treatment tank was sampled every other day to monitor nutrient concentrations (phosphate, ammonium, nitrate + nitrite) throughout the incubation.

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description	We conducted a year-long study with the main objective of comparing denitrification, anammox, and dissimilatory nitrate reduction to ammonium (DNRA) across three different vegetation zones (Distichlis spicata, Juncus roemerianus, and Cladium mariscus Spp.) in the salt marsh at Weeks Bay National Estuarine Research Reserve (NERR) in Fairhope, AL., USA. Sediment samples were collected from each vegetation zone to measure rates of denitrification, anammox, and DNRA using a membrane inlet mass spectrometer. Percent nitrate removal was calculated as the product of denitrification plus anammox divided by the sum of all three nitrate reduction processes. Plant biomass and soil carbon and nitrate content were collected to characterize each zone. Nutrient stocks for phosphate, ammonium, nitrate + nitrite, and hydrogen sulfides from each marsh were measured from porewater samples taken from 10 cm depth within each vegetation zone. We also performed a laboratory manipulation where we subjected sediments from each vegetation zone with nitrate and organic matter (Spirulina cyanobacteria) in a full factorial design, giving us four total treatment conditions: control, + nitrate only, + organic matter only, and + nitrate + organic matter. We incubated sediments in anoxic tanks in their respective treatments for 28 days while periodically removing a subset of sediment over five timepoints during the incubation (days 1, 3, 7, 15, and 28). The removed sediments were used to measure denitrification, anammox and DNRA potentials with the objective to see how nitrate and organic matter influence nitrate reduction processes from sediments across the three vegetation types. Overlying water from each treatment tank was sampled every other day to monitor nutrient concentrations (phosphate, ammonium, nitrate + nitrite) throughout the incubation.
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identifier	gov.noaa.nodc:0301084
issued	2025-01-23T00:00:00.000+00:00
keyword	[ "0301084", "AMMONIUM (NH4)", "BIOMASS", "CARBON", "NITRATE", "nitrate + nitrite content (concentration)", "NITROGEN", "phosphate", "SEDIMENT - HYDROGEN SULPHIDE CONTENT", "SEDIMENT - POREWATER CHEMISTRY", "SEDIMENTS - TOTAL CARBON", "Vegetation Cover", "fluorometer", "spectrophotometer", "in situ", "laboratory analyses", "University of Alabama", "University of Alabama", "Coastal Waters of Alabama", "oceanography", "EARTH SCIENCE > BIOSPHERE > VEGETATION > BIOMASS", "EARTH SCIENCE > BIOSPHERE > VEGETATION > VEGETATION COVER", "EARTH SCIENCE > OCEANS > MARINE SEDIMENTS", "EARTH SCIENCE > OCEANS > MARINE SEDIMENTS > SEDIMENT CHEMISTRY", "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > AMMONIA", "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON", "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE", "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRITE", "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITROGEN", "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PHOSPHATE", "Aboveground Biomass", "Anaerobic Ammonium Oxidation", "Belowground biomass (0-15 cm depth)", "Belowground biomass (0-5 cm depth)", "Denitrification Potential", "Dissimilatory Nitrate Reduction to Ammonium", "Percent Nitrate Removal", "Porewater Ammonium", "Porewater Hydrogen Sulfide", "Porewater Phosphate", "Porewater nitrate + nitrite", "Sediment Carbon", "Sediment Nitrogen", "Total Nitrate Reduction", "Total sediment extractable ammonium", "carbon to nitrogen ratio", "FLUOROMETERS > FLUOROMETERS", "OPTSPEC > Optical Spectrometer", "Balance", "Membrane inlet mass spectrometer", "elemental analyzer", "OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF AMERICA", "OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF MEXICO", "K6ED3F" ]
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modified	2025-02-05T00:00:00.000+00:00
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spatial	-87.826089,30.41568,-87.829088,30.416272
temporal	2021-05-26T00:00:00+00:00/2022-05-24T00:00:00+00:00
title	Sediment and porewater nitrification and organic matter data in a Northern Gulf of Mexico marsh from 2021-05-26 to 2022-05-21 (NCEI Accession 0301084)

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