東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Organic matter cycling and nutrient ...

University of Hawai'i at Manoa.

FindBook

Google Book

Amazon

博客來

Organic matter cycling and nutrient dynamics in marine sediments.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Organic matter cycling and nutrient dynamics in marine sediments./
作者:	Hannides, Angelos K.
面頁冊數:	468 p.
附註:	Adviser: Francis J. Sansone.
Contained By:	Dissertation Abstracts International69-05B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3312592
ISBN:	9780549632306

Organic matter cycling and nutrient dynamics in marine sediments.
Hannides, Angelos K.

Organic matter cycling and nutrient dynamics in marine sediments. - 468 p.

Adviser: Francis J. Sansone.

Thesis (Ph.D.)--University of Hawai'i at Manoa, 2008.

This dissertation explores two recently recognized pathways of organic matter supply to marine sediments and their impact on sedimentary biogeochemistry: The entrapment and decomposition of particulate organic matter in permeable sediments and the resulting nutrient dynamics were investigated with a specially designed experimental laboratory microcosm that allows permeable sediment incubation under controlled physical forcing. Microcosm generated enhanced solute transport rates were roughly proportional to sediment column permeability. Comparison with field observations revealed that the enhanced transport rates induced by the experimental conditions were lower than those observed in the field, and this was also reflected in the enhanced buildup of pore water nutrients relative to concentrations in field sediments. Particulate organic matter and nutrient enrichment experiments, conducted with the microcosm, demonstrated the rapid uptake of both particles and solutes by the permeable sediment column under physical forcing, the rapid decomposition of the removed particles, and the lack of regenerated nutrient build-up. Nutrient enrichment experiments with sediment plug chambers demonstrated the rapid uptake and retention of nutrients by surface permeable sediments, as well as the loss of nitrogen though benthic denitrification in sediment grain microzones. The processing of large organic matter packages on the deepsea floor by deep-sea communities was investigated using natural and experimental whale, kelp and wood falls in the California Borderland Basins region, focusing on their quality and its impact on sedimentary organic enrichment and redox shifts. Labile organic material generated by the processing of whale falls and kelp falls generated substantial pore water sulfide levels in impacted sediment, despite a small organic enrichment signal. In contrast, wood derived material input did not result in sulfidic conditions, despite generating very high organic enrichment in impacted sediments, due to its refractory nature. A constructed model incorporating metazoan processing and dispersal of fragmented material revealed that whale fall processing is characterized by higher rates of tissue removal, organic carbon release, and carbon sedimentation rates than wood fall processing. However, organic carbon release rates, when normalized to fall weight, are similar between the two types of falls, due to differences in their carbon content and in absorption rates during metazoan ingestion.

ISBN: 9780549632306Subjects--Topical Terms:

545717
Biogeochemistry.

Organic matter cycling and nutrient dynamics in marine sediments.
LDR:03431nmm 2200289 a 45 001 890511
005 20101103
008 101103s2008 eng d
020 $a 9780549632306
035 $a (UMI)AAI3312592
035 $a AAI3312592
040 $a UMI $c UMI
100 1 $a Hannides, Angelos K. $3 1064458
245 1 0 $a Organic matter cycling and nutrient dynamics in marine sediments.
300 $a 468 p.
500 $a Adviser: Francis J. Sansone.
500 $a Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 2831.
502 $a Thesis (Ph.D.)--University of Hawai'i at Manoa, 2008.
520 $a This dissertation explores two recently recognized pathways of organic matter supply to marine sediments and their impact on sedimentary biogeochemistry: The entrapment and decomposition of particulate organic matter in permeable sediments and the resulting nutrient dynamics were investigated with a specially designed experimental laboratory microcosm that allows permeable sediment incubation under controlled physical forcing. Microcosm generated enhanced solute transport rates were roughly proportional to sediment column permeability. Comparison with field observations revealed that the enhanced transport rates induced by the experimental conditions were lower than those observed in the field, and this was also reflected in the enhanced buildup of pore water nutrients relative to concentrations in field sediments. Particulate organic matter and nutrient enrichment experiments, conducted with the microcosm, demonstrated the rapid uptake of both particles and solutes by the permeable sediment column under physical forcing, the rapid decomposition of the removed particles, and the lack of regenerated nutrient build-up. Nutrient enrichment experiments with sediment plug chambers demonstrated the rapid uptake and retention of nutrients by surface permeable sediments, as well as the loss of nitrogen though benthic denitrification in sediment grain microzones. The processing of large organic matter packages on the deepsea floor by deep-sea communities was investigated using natural and experimental whale, kelp and wood falls in the California Borderland Basins region, focusing on their quality and its impact on sedimentary organic enrichment and redox shifts. Labile organic material generated by the processing of whale falls and kelp falls generated substantial pore water sulfide levels in impacted sediment, despite a small organic enrichment signal. In contrast, wood derived material input did not result in sulfidic conditions, despite generating very high organic enrichment in impacted sediments, due to its refractory nature. A constructed model incorporating metazoan processing and dispersal of fragmented material revealed that whale fall processing is characterized by higher rates of tissue removal, organic carbon release, and carbon sedimentation rates than wood fall processing. However, organic carbon release rates, when normalized to fall weight, are similar between the two types of falls, due to differences in their carbon content and in absorption rates during metazoan ingestion.
590 $a School code: 0085.
650 4 $a Biogeochemistry. $3 545717
650 4 $a Biology, Oceanography. $3 783691
650 4 $a Environmental Sciences. $3 676987
690 $a 0416
690 $a 0425
690 $a 0768
710 2 0 $a University of Hawai'i at Manoa. $3 1017511
773 0 $t Dissertation Abstracts International $g 69-05B.
790 $a 0085
790 1 0 $a Sansone, Francis J., $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3312592