NDLI: Pyrite accumulation and sulfate depletion as affected by root distribution in aJuncus (needle rush) salt marsh

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Pyrite accumulation and sulfate depletion as affected by root distribution in aJuncus (needle rush) salt marsh

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Pyrite accumulation and sulfate depletion as affected by root distribution in aJuncus (needle rush) salt marsh

Content Provider	Springer Nature Link
Author	Hsieh, Y. P. Yang, C. H.
Copyright Year	1997
Abstract	This study was undertaken to investigate patterns of pyrite accumulation found in aJuncus roemerianus tidal marsh of north Florida. We speculate that the pattern of pyrite accumulation was caused mainly by the distribution of roots. Sediment cores from living stands (LS), dead stands (DS), and recently killed stands (RKS) were collected and analyzed for dissolved organic carbon (DOC), sulfate, chloride, Cr(II)-reducible sulfide, and biomass of roots and rhizomes. Living roots were distributed mainly in the upper 16 cm and concentrated 4–10 cm below the sediment surface. Pyrite accumulations were significantly different among the three types of sediment cores in the upper 16 cm sediment and follow the descending order of DS (615 μmol cm$^{−3}$)>RKS (547 μmol cm$^{−3}$)>LS (368 μmol cm$^{−3}$). Between 20 cm and 30 cm, pyrite contents approached values of 40 μmol cm$^{−3}$ and 55 μmol cm$^{−3}$ in all sediment cores. The degree of pyritization approaches 92–94% between 14 cm and 20 cm where pyrite accumulation was probably limited by available iron. Root distribution also affected the redistribution of iron through iron sulfide formation. Sulfate depletion in the upper 16 cm was higher in RKS (79.3 μmol cm$^{−3}$) than DS (49.1 μmol cm$^{−3}$). No significant sulfate depletion was found in LS. Sulfate reduction under DS was likely limited by the readily available substrates. Root distribution had a major influence on pyrite accumulation and sulfate reduction of the marsh, and its effects need to be addressed in studies of wetland sulfur dynamics.
Starting Page	640
Ending Page	645
Page Count	6
File Format	PDF
ISSN	01608347
Journal	Estuaries
Volume Number	20
Issue Number	3
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Environment Ecology Geosciences Freshwater & Marine Ecology Environmental Management Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Aquatic Science Environmental Science

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