CO2emission and soil Eh responses to different hydrological conditions in fresh, brackish, and saline marsh soils

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Abstract
The effects of various water‐table depths during continuous and simulated tidal drainage on CO2 emissions and soil Eh were examined in intact fresh, brackish, and saline marsh soil cores. CO2 emissions did not differ between continuous and tidal drainage. CO2 emissions were greatest in fresh cores and least in brackish cores at all water‐table depths tested. Eh was higher in brackish cores and lower in fresh and saline cores at all water‐table depths tested. Eh increased with decreasing water‐table depth and increased more during continuous drainage than during tidal drainage. These results exclude the possibility that reported differences in field measurements of CO2 emission among fresh, brackish, and saline marsh soils relate to different hydrological conditions in the marsh types; they also indicate that fundamental differences in decomposition processes and soil Eh exist among these marsh types. Although not tested, differences were attributed to the different species of emergent vegetation occupying the different marsh types and which are the sources of soil organic matter.

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