Nutrient cycling between the water column and a marine sediment. I. Organic carbon |
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Authors: | E. O. Hartwig |
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Affiliation: | (1) Institute of Marine Resources, University of California, San Diego, La Jolla, California, USA;(2) Chesapeake Bay Institute, The Johns Hopkins University, 21218 Baltimore, Maryland, USA |
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Abstract: | The carbon flow through the sediments at a station located in 18.3 m of water off the Scripps Institution of Oceanography, San Diego, California (USA) was determined. The parameters studied [and their mean rates of input (+) or output (-) to the benthos] were macro-detritus (+0.028 gC m-2day-1), fallout of particulate debris (+3.3 gC m-2day-1), benthic net photosynthesis during the day (-0.06 gC m-2 daylight period-1), burial (0 gC m-2day-1), benthic respiration at night (-0.28 gC m-2 night period-1), and resuspension (-3.0 gC m-2day-1). Resuspension of sediment at this station was found to have a controlling effect on the sediment organic carbon content. Benthic photosynthesis was able to provide 79% of the organic carbon required by the benthos for respiration during the daylight hours. A carbon-flow diagram linking together all of the above measurements is presented. |
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