Nitrogen substrate–dependent nitrous oxide cycling in salt marsh sediments

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ID: 298860
2015
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Abstract
Nitrous oxide (N 2 O) is important to Earth's climate because it is a strong absorber of radiation and an important ozone depletion agent. Increasing anthropogenic nitrogen input into the marine environment, especially to coastal waters, has led to increasing N 2 O emissions. Identifying the nitrogen compounds that serve as substrates for N 2 O production in coastal waters reveals important pathways and helps us understand their control by environmental factors. In this study, sediments were collected from a long-term fertilization site in Great Sippewissett Marsh, Falmouth, Massachusetts. The 15 N tracer incubation time course experiments were conducted and analyzed for potential N 2 O production and consumption rates. The two nitrogen substrates of N 2 O production, ammonium and nitrate, correspond to the two production pathways, nitrification and denitrification, respectively. When measurable nitrate was present, despite ambient high ammonium concentrations, denitrification was the major N 2 O production pathway. When nitrate was absent, ammonium became the dominant substrate for N 2 O production, via nitrification and coupled nitrification-denitrification. Net N 2 O consumption was enhanced under low oxygen and nitrate conditions. N 2 O production and consumption rates increased with increasing levels of nitrogen fertilization in long-term experimental plots. These results indicate that increasing anthropogenic nitrogen input to salt marshes can stimulate sedimentary N 2 O production via both nitrification and denitrification, whereas episodic oxygen depletion results in net N 2 O consumption.
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Authors Qixing Ji, Andrew R. Babbin, Xuefeng Peng, Jennifer L. Bowen, Bess B. Ward
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Journal journal of marine research
Year 2015
DOI
10.1357/002224015815848820
URL
https://doi.org/10.1357/002224015815848820
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