搜索结果: 1-15 共查到“海洋生物学 sediments”相关记录30条 . 查询时间(0.125 秒)
Exploration of Life in Deep Subseafloor Sediments
Exploration of Life Deep Subseafloor Sediments
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2015/7/24
The scientific ocean drilling community has been retrieving cores from hundreds of meters below the seafloor since the inception of the Deep Sea Drilling Project (DSDP) in 1968. While microbiological ...
Constrained microbial processing of allochthonous organic carbon in boreal lake sediments
Constrained microbial processing allochthonous organic carbon boreal lake sediments
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2014/4/2
We investigated sediment bacterial metabolism in eight lakes with different inputs of allochthonous and autochthonous organic carbon in south-central Sweden. Sediment bacterial production, mineralizat...
Role of sulfate reduction and methane production by organic carbon degradation in eutrophic fjord sediments (Limfjorden, Denmark)
Role of sulfate reduction methane production organic carbon degradation eutrophic fjord sediments
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2014/4/17
The anaerobic mineralization of buried organic matter through sulfate reduction and methanogenesis was studied in 2-m-long piston cores of organic-rich, silty-clay sediment from two sites in Limfjorde...
Direct determination of nitrogen cycling rates and pathways in Arctic fjord sediments (Svalbard, Norway)
pathways nitrogen cycling rates
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2014/4/16
Results from a study of benthic nitrogen cycling in two Arctic fjords are presented. Intact sediment core
incubations were used to quantify net fluxes of dissolved inorganic nitrogen, organic nitroge...
Molecular evidence for anaerobic ammonium–oxidizing (anammox) bacteria in continental shelf and slope sediments off northwest Africa
Molecular evidence anaerobic ammonium–oxidizing bacteria in continental shelf slope sediments off northwest Africa
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2014/4/16
The presence and abundance of anaerobic ammonium–oxidizing (anammox) bacteria was investigated in continental shelf and slope sediments (300–3000 m water depth) off northwest Africa in a combined appr...
The role of organic acid exudates in liberating phosphorus from seagrass-vegetated carbonate sediments
The role of organic acid exudates liberating phosphorus seagrass-vegetated carbonate sediments
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2014/4/21
Sediment-bound phosphorus (P) is a potential nutrient source for P-limited seagrasses inhabiting carbonate sediments. We explored the role of organic acid (OA) exudation by seagrasses in liberating mi...
Microscale mineralization pathways in surface sediments: A chemical sensor study in Lake Baikal
Microscale mineralization pathways surface sediments A chemical sensor study Lake Baikal
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2014/5/4
We used an array of ion-selective electrodes (oxygen [O2], hydrogen [H+], carbonate [CO32-], calcium [Ca2+], ammonium [NH4+], and nitrate [NO3-]) with a micromanipulator to study mineralization proces...
Changes in accumulation of organic matter and stable carbon and nitrogen isotopes in sediments of two Slovenian mountain lakes (Lake Ledvica and Lake Planina), induced by eutrophication changes
organic matter table carbon
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2014/4/30
We measured accumulation rates of organic carbon (OC) and total nitrogen (TN) and stable carbon (d
13
Corg
) and
nitrogen isotopes (d
15
N) in the sediments of two mountain lakes (Lake Ledvica a...
Effect of macrozoobenthos on two-dimensional small-scale heterogeneity of pore water phosphorus concentrations in lake sediments: A laboratory study
Effect of macrozoobenthos two-dimensional small-scale heterogeneity pore water phosphorus concentrations lake sediments A laboratory study
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2014/5/9
We used mesocosms equipped with two-dimensional (2D) pore water samplers (24 rows X 24 columns, 9-mm spatial resolution) to resolve and quantify some of the complex spatial patterns in diagenetic reac...
Quantification of macrobenthic effects on diagenesis using a multicomponent inverse model in salt marsh sediments
Quantification of macrobenthic effects diagenesis using multicomponent inverse model salt marsh sediments
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2014/5/19
Using a multicomponent inverse model, we quantified the rates of organic matter (OM) remineralization and the relative importance of major terminal electron acceptors [Fe(III)-(oxy)hydroxides and SO4-...
Denitrification and anammox activity in Arctic marine sediments
Denitrifi cation anammox activity
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2014/5/19
We measured rates of N2
production through anaerobic NH oxidation with NO (anammox) and denitrification 1 2
4 2
in permanently cold (from 21.78C to 48C) sediments off the east and west coasts...
Oxygen dynamics in permeable sediments with wave-driven pore water exchange
Oxygen dynamics permeable sediments wave-driven pore water exchange
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2014/5/14
The effects of advective pore water exchange driven by shallow water waves on the oxygen distribution in a permeable (k = 3.3 x 10-12 to 4.9 x 10-11 m2) natural sediment were studied with a planar oxy...
Transmission of oxygen concentration fluctuations through the diffusive boundary layer overlying aquatic sediments
oxygen concentration fluctuations diffusive boundary layer aquatic sediments
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2014/5/14
Even though the O2 concentration in the diffusive boundary layer overlying natural aquatic sediments usually varies over time, microprofiles with little or no error bars are abundant in the literature...
Benthic primary production and nutrient cycling in sediments with benthic microalgae and transient accumulation of macroalgae
Benthic primary production nutrient cycling sediments benthic microalgae transient accumulation of macroalgae
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2014/5/22
Annual rates of sediment denitrification and sediment-water fluxes of oxygen and nutrients were quantified at two shallow locations, Virksund and Ulbjerg, in the Limfjorden, Denmark. The sediment was ...
Submillimeter life positions of bacteria, protists, and metazoans in laminated sediments of the Santa Barbara Basin
Submillimeter life positions of bacteria, protists, and metazoans in laminated sediments of the Santa Barbara Basin
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2014/5/20
To provide insights into the biogeochemistry of environments where steep chemical gradients place anaerobes, microaerophiles, and aerobes in close proximity, it might be necessary to survey biotic dis...