Decomposition dynamics of six salt marsh halophytes as determined by cupric oxide oxidation and direct temperature-resolved mass spectrometry

Article Abstract:

Decomposition dynamics of six salt marsh halophytes is discussed based on measurement over 2 years using cupric oxide oxidation and direct temperature-resolved mass spectrometry. The goal is finding out whether the lignin moiety of halophytic herbaceous plants shows high resistance to biodegradation relative to bulk organic matter and if so to find a chemically defined endmember of biodegraded lignin, a suitable tracer for halophytic material exported from salt marshes into the ocean. Likely microbial N-acetylglucosamine is incorporated into the complex decomposition residue, and humification is via condensation of small degradation products.

Canada, Netherlands, Usage, Physiological aspects, Copper oxide, Copper oxides, Lignin, Tidal marsh ecology, Salt marsh ecology, Halophytes

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Patterns of groundwater discharge into Florida Bay

Article Abstract:

Patterns of groundwater discharge into Florida Bay are discussed based on research to evaluate the significance of the discharge and the potential of groundwater as a contributor to the surface-water nutrient pool. An effort was made to locate areas in the bay where groundwater seepage was most pronounced by using reconnaissance surveys of radon and methane concentrations. Results indicate more groundwater flow along the bay side of the Florida Keys, and the eastern part of Florida may provide as much N and P as Everglades surface freshwater sources, but inputs are not uniform.

Florida, Measurement, Sewage, Water pollution, Everglades, Groundwater flow, Florida Keys, Bays

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