The influence of light and nutrient addition upon the sediment chemistry of iron in an arctic lake |
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Authors: | Susan F Sugai George W Kipphut |
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Institution: | (1) Institute of Marine Science, University of Alaska, 99775-1080 Fairbanks, AK, USA;(2) Present address: Center for Reservoir Research, Murray State University, 42071 Murray, KY, USA |
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Abstract: | The geochemical response of sediments to increased nutrient input to an Alaskan, arctic lake was examined using direct measurements
of sediment-water chemical fluxes. An unexpected increase in Fe flux occurred when sediments were exposed to high incident
radiation and nutrient concentrations. Correlation between light and acid-soluble Fe concentrations suggests that photoreduction
of Fe(III) oxides may occur, but nutrient addition enhanced the effect indicating that primary productivity was also important.
The processes controlling the flux of Fe from sediments in this lake were complex and included the redox potential (dissolved
oxygen concentration) of the water, quality of organic matter present in the sediment, light, and nutrients supplied from
the sediments and/or water column. These four factors together with the possibility of direct uptake of Fe by phytoplankton
and the possible release of algal reductants may contribute to Fe cycling in this lake. |
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Keywords: | iron sediment nutrients photoreduction arctic |
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