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CO 2 emission and soil Eh responses to different hydrological conditions in fresh, brackish, and saline marsh soils
Author(s) -
Nyman J. A.,
DeLaune R. D.
Publication year - 1991
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1991.36.7.1406
Subject(s) - brackish water , brackish marsh , water table , marsh , drainage , soil water , environmental science , hydrology (agriculture) , salt marsh , soil salinity , vegetation (pathology) , soil science , groundwater , salinity , geology , ecology , oceanography , wetland , biology , medicine , geotechnical engineering , pathology
The effects of various water‐table depths during continuous and simulated tidal drainage on CO 2 emissions and soil Eh were examined in intact fresh, brackish, and saline marsh soil cores. CO 2 emissions did not differ between continuous and tidal drainage. CO 2 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 CO 2 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.