Abstract
We have shown earlier that fresh and dead tissues of Spartina alterniflora, a plant species dominating Atlantic and Gulf coast salt marshes, contain humic substances which may be released into seawater. Carbon-13 NMR spectra have now been used to compare the chemical structures of these humic substances with humic matter extracted from mud in which S. alterniflora was growing. The results indicate that the mud humic matter differs from humic substances extracted from fresh plants primarily in the pattern of O-substitution of aromatic structures. However, humic substances associated with dead plants, or with fresh plants that had been incubated for a long time in seawater containing microorganisms indigenous to the mud, showed a great similarity to the humic matter from salt marsh mud.
Published Version
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