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Insights Into Marine Nitrogen Cycling in Coastal Sediments: Inputs: (English)

Insights Into Marine Nitrogen Cycling in Coastal Sediments: Inputs: (English)

          
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About the Book

Denitrification mechanisms and rates were determined in Georgia continental shelf and salt marsh sediments. Isotope tracer and membrane inlet mass spectrometry (MIMS) techniques were employed during all denitrification studies in this dissertation. MIMS measurements were also improved by investigating and optimizing experimental parameters. Canonical heterotrophic denitrification was measured in the oxygenated, organic-poor, sandy sediments of the Georgia continental shelf. Rates of denitrification were found to be low in the Georgia sands, as expected, but these rates would be significant globally if extrapolated over all sandy, continental shelf sediments. Heterotrophic denitrification was found to be the sole pathway of fixed N removal in these environments. The O2 effect, an instrument-specific phenomenon in which O2 and N2 interact within the ion source of the mass spectrometer to form NO+, was examined. This effect can adversely affect N2 measurements and subsequent denitrification estimates. An optimal flow rate was determined that minimized the O2 effect yet maintained analytically reasonable sampling times. Lastly, N2 fixation and denitrification were simultaneously measured in Georgia salt marsh sediments during the summer and winter. The mechanism of denitrification varies with the season and is consistent with previous findings of seasonal variations of anaerobic respiration rates. Rates of both denitrification and nitrogen fixation are low and almost equal. These findings suggest that denitrification and N2 fixation balance one another internally, preventing large fluxes of N from entering or leaving salt marsh ecosystems. The results of these studies show that direct measurements of N cycling processes are vital to understanding the nuances of local N cycling.


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Product Details
  • ISBN-13: 9781243623102
  • Publisher: Proquest, Umi Dissertation Publishing
  • Publisher Imprint: Proquest, Umi Dissertation Publishing
  • Height: 254 mm
  • No of Pages: 112
  • Series Title: English
  • Weight: 240 gr
  • ISBN-10: 1243623101
  • Publisher Date: 01 Sep 2011
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 7 mm
  • Width: 203 mm


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