Size and density distribution of sulfide-producing microniches in lake sediments.

Size and density distribution of sulfide-producing microniches in lake sediments. Research Abstract Details 

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Size and density distribution of sulfide-producing microniches in lake sediments. Abstract Text:

Anders Widerlund,William Davison,Anders Widerlund,William Davison,

The technique of diffusive gradients in thin films (DGT) with measurements by computer-imaging densitometry (CID) was used to study the in situ, two-dimensional distribution of sulfide-producing microniches in sediments from a eutrophic lake (Esthwaite Water, UK). The DGT-CID technique precipitates and immobilizes the net pore-water flux of dissolved sulfide as black Ag2S by reaction with a AgI binding gel. The mass of accumulated sulfide is then determined from a scanned grayscale image of this gel. DGT probes deployed in laboratory mesocosms of homogeneously mixed sediment, then analyzed at high spatial resolution (approximately 0.1 mm), showed that apparent niche areas (operationally defined by DGT-CID) were <1 mm2 for 30% of the niches. In eight DGT probes deployed in undisturbed sediment cores, the proportion of microniche-related sulfide flux was > or =1-8% of the total horizontal net pore-water flux of sulfide. This study suggests that microniches that introduce local redox gradients are common in sediments. As fluxes within these microenvironments can considerably exceed background values, consideration of the dynamics of the biogeochemical processes occurring at these sites is likely to be key to improving our understanding of early diagenesis. Measurement procedures and three-dimensional reaction-transport models should be designed with the aim of furthering understanding of the complexities associated with locally supplied particles of reactive organic matter.

Size and density distribution of sulfide-producing microniches in lake sediments. Publishing Authors By Initials

A Widerlund,W Davison,A Widerlund,W Davison,

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Size and density distribution of sulfide-producing microniches in lake sediments. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Environmental science & technology

VOLUME: 41

Page Numbers: 8044-9

Journal Abbreviation: Environ. Sci. Technol.

ISSN: 0013-936X

DAY: 1

MONTH: Dec

YEAR: 2007

Size and density distribution of sulfide-producing microniches in lake sediments. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Size and density distribution of sulfide-producing microniches in lake sediments.

AFFILIATION: Department of Environmental Sciences, IENS, Lancaster University, Lancaster LA1 4YQ, UK. Anders.Widerlund@ltu.se

Country: United States

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MEDLINETA: Environ Sci Technol

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