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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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Hydrologic Connectivity Regulates Riverine N2O Sources and Dynamics.

Minpeng Hu1,2, Zhongjie Yu1, Timothy J Griffis3

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Environmental Science & Technology
|May 23, 2024
PubMed
Summary

Terrestrial ecosystems significantly contribute to riverine nitrous oxide (N2O) emissions, primarily through nitrification. Hydrologic connectivity is key, and current models may underestimate N2O due to overlooking this terrestrial input.

Keywords:
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Area of Science:

  • Environmental Science
  • Biogeochemistry
  • Ecology

Background:

  • Indirect nitrous oxide (N2O) emissions from streams and rivers are a significant, yet poorly understood, component of the global N2O budget.
  • Existing models often overemphasize denitrification as the primary source of riverine N2O, neglecting direct terrestrial inputs.

Purpose of the Study:

  • To investigate the sources and dynamics of riverine N2O emissions in a U.S. Corn Belt river network.
  • To assess the role of terrestrial-aquatic interactions and hydrologic connectivity in controlling riverine N2O production and transport.

Main Methods:

  • Utilized N2O isotope measurements to trace emission sources.
  • Employed spatial stream network modeling to analyze N2O dynamics across the river network.

Main Results:

  • Nitrification was identified as a substantial source (>30%) of riverine N2O across the network.
  • Direct delivery of soil-produced N2O to streams accounted for over 40% of total riverine emissions.
  • Hydrologic connectivity strongly influences N2O sources and dynamics.

Conclusions:

  • Terrestrial N2O input, particularly from nitrification, is a critical, often underestimated, factor in riverine N2O emissions.
  • Climate change (wetter, warmer) may amplify this terrestrial-aquatic N2O feedback loop.
  • Current models may underestimate riverine N2O emissions due to insufficient representation of hydrologic connectivity.