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The dynamics of pore-water dissolved...

Seagle, Carol Ann.

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The dynamics of pore-water dissolved organic carbon and the fate of organic matter in anoxic marine sediments: An assessment using carbon isotopes and ultrafiltration.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	The dynamics of pore-water dissolved organic carbon and the fate of organic matter in anoxic marine sediments: An assessment using carbon isotopes and ultrafiltration./
作者:	Seagle, Carol Ann.
面頁冊數:	123 p.
附註:	Director: Marc J. Alperin.
Contained By:	Dissertation Abstracts International63-03B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3047073
ISBN:	0493610464

The dynamics of pore-water dissolved organic carbon and the fate of organic matter in anoxic marine sediments: An assessment using carbon isotopes and ultrafiltration.
Seagle, Carol Ann.

The dynamics of pore-water dissolved organic carbon and the fate of organic matter in anoxic marine sediments: An assessment using carbon isotopes and ultrafiltration. - 123 p.

Director: Marc J. Alperin.

Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2002.

Pore-water DOC plays a significant role in the microbial degradation of organic matter in anoxic environments, the preservation of organic matter in marine sediment, and may contribute to the global oceanic DOC reservoir. The primary focus of this work was to elucidate the role pore-water DOC plays in the biogeochemical cycling of organic matter in marine sediments.

ISBN: 0493610464Subjects--Topical Terms:

545717
Biogeochemistry.

The dynamics of pore-water dissolved organic carbon and the fate of organic matter in anoxic marine sediments: An assessment using carbon isotopes and ultrafiltration.
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100 1 $a Seagle, Carol Ann. $3 1251721
245 1 0 $a The dynamics of pore-water dissolved organic carbon and the fate of organic matter in anoxic marine sediments: An assessment using carbon isotopes and ultrafiltration.
300 $a 123 p.
500 $a Director: Marc J. Alperin.
500 $a Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1514.
502 $a Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2002.
520 $a Pore-water DOC plays a significant role in the microbial degradation of organic matter in anoxic environments, the preservation of organic matter in marine sediment, and may contribute to the global oceanic DOC reservoir. The primary focus of this work was to elucidate the role pore-water DOC plays in the biogeochemical cycling of organic matter in marine sediments.
520 $a Four experiments were conducted. In the first, fresh organic matter was added to anoxic sediment; methanogenic and sulfate-reducing treatments were established; and the transformation of carbon from the particulate form, to dissolved organic intermediates and inorganic end products was traced. This experiment showed that the source of organic matter, not the terminal metabolic community, was the primary determinant of remineralization efficiency; and, through measurements of the isotopic signature of the degradation intermediates, that a fraction of the organic matter which was unreactive in situ, was degraded as a result of the addition of fresh substrate.
520 $a In the second experiment, methanogenic sediment was amended with fresh phytoplankton, and the concentration of DOC was measured as a function of time. Additionally, DOC was size fractionated using stirred-cell ultrafiltration. Designed to elucidate the relationship between reactivity and size, this experiment showed that net production of DOC occurred in the 10–100 kDa size range.
520 $a The third and fourth experiments were field experiments. <super>13</super>C-labelled diatoms were placed on the seafloor, and samples were collected at t = 0, 1.5 days and 14 months. <super>13</super>C-enriched POC at depths >10 cm indicated that the activities of macrobenthic organisms subducted labeled substrate in 1.5 days, and enriched DOC and dissolved inorganic carbon (DIC) isotopic signatures at depth 1.5 d after the carbon addition was evidence of rapid remineralization. After 14 months, <super>13</super>C-labeled carbon remained at both sites, providing evidence of the importance of internal recycling of carbon and the profound effect that infauna can have on sediment geochemistry.
520 $a The fourth experiment utilized bomb <super>14</super>C as a tracer for modern carbon in continental slope sediment. Unfortunately, beyond successful methods-development, this experiment failed to produce meaningful results due to a contamination problem.
590 $a School code: 0153.
650 4 $a Biogeochemistry. $3 545717
650 4 $a Engineering, Marine and Ocean. $3 1019064
650 4 $a Environmental Sciences. $3 676987
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690 $a 0547
690 $a 0768
710 2 0 $a The University of North Carolina at Chapel Hill. $3 1017449
773 0 $t Dissertation Abstracts International $g 63-03B.
790 $a 0153
790 1 0 $a Alperin, Marc J., $e advisor
791 $a Ph.D.
792 $a 2002
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