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Dissolved Solute Sampling Across an Oxic-Anoxic Soil-Water Interface Using Microdialysis Profilers
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Manganese-Driven Carbon Oxidation at Oxic-Anoxic Interfaces.

Morris E Jones1, Peter S Nico2, Samantha Ying3

  • 1School of Earth & Sustainability and Stockbridge School of Agriculture , University of Massachusetts , Amherst , Massachusetts 01003 , United States.

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|September 28, 2018
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Summary

Reactive manganese species drive soil carbon oxidation at oxygen-limited interfaces. This study shows manganese(III) formation directly enhances carbon breakdown and CO2 release in soils and sediments.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Soil Science

Background:

  • Reactive manganese species regulate carbon oxidation and CO2 emissions in soils and sediments.
  • Oxic-anoxic interfaces in subsurface environments facilitate manganese redox cycling.

Purpose of the Study:

  • To investigate the impact of manganese(II) aqueous (Mn(II)aq) oxidation on carbon oxidation at oxic-anoxic interfaces in soils.
  • To elucidate the relationship between manganese redox cycling and carbon breakdown processes.

Main Methods:

  • Laboratory-based diffusion reactors were employed to simulate soil conditions.
  • Cyclic voltammetry, X-ray absorption spectroscopy, and X-ray microprobe imaging were used for analysis.
  • Quantified lignin oxidation, carbon solubilization, and oxidation rates.

Main Results:

  • A strong coupling was observed between Mn(II)aq oxidation and carbon oxidation at the oxic-anoxic interface.
  • Zones of Mn(II)aq oxidation showed heightened lignin oxidation potential, carbon solubilization, and oxidation.
  • Manganese(III)-dominated precipitates were found to coincide with active carbon oxidation.

Conclusions:

  • Biotic Mn(II)aq oxidation, particularly the formation of manganese(III) species, significantly contributes to carbon oxidation at soil oxic-anoxic interfaces.
  • Carbon oxidation rates are influenced by microenvironments that promote the formation of oxidants like manganese(III), not solely by molecular composition.
  • Understanding manganese cycling is crucial for predicting soil carbon turnover and CO2 emissions.