Anaerobic metabolism in Lake Washington sediments Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/h128ng045

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  • A method of measuring the dehydrogenase activity of sediments at lOC was calibrated by direct microcalorimetry at the same temperature. Field measurements of dehydrogenase activity of sediments in Lake Washington were converted to rates of metabolic heat release by means of the significant regression of dehydrogenase activity on metabolic heat release. Simultaneous field measurements at IOC of oxygen uptake by undistrubed sediment cores were coverted to rates of metabolic heat release by the factor 4.8 cal liberated per milliliter of oxygen consumed. Dehydrogenase activity varies from place to place and differs between layers of the same core. Although there is a general trend of decreasing activity with sediment depth, some subsurface layers have relatively high activity. Dehydrogenase activity, which was detected down to the deepest layers of the sediment cores, 21 to 31 cm, appears to be more a function of plankton remains than of total organic carbon in the sediment. The integrated metabolic heat release based on dehydrogenase activity of the entire core was invariably greater than the metabolic heat release calculated from the rates of oxygen uptake. Thus, it appears that the rate of total oxygen uptake by the sediment surface underestimates benthic community metabolism in the sediment column.
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  • Master files scanned at 600 ppi (256 Grayscale) using Capture Perfect 3.0 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (256 B&W), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 3.1 was used for pdf compression and textual OCR.
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  • description.provenance : Made available in DSpace on 2008-01-29T21:23:07Z (GMT). No. of bitstreams: 1 Internal Report_89.pdf: 442246 bytes, checksum: 9e412bed5c73a9a519552e0be27a37e7 (MD5) Previous issue date: 1972
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2008-01-29T21:23:07Z (GMT) No. of bitstreams: 1 Internal Report_89.pdf: 442246 bytes, checksum: 9e412bed5c73a9a519552e0be27a37e7 (MD5)
  • description.provenance : Submitted by Adam Powell (apscanner@gmail.com) on 2008-01-24T23:42:33Z No. of bitstreams: 1 Internal Report_89.pdf: 442246 bytes, checksum: 9e412bed5c73a9a519552e0be27a37e7 (MD5)

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