Oxygen dynamics in permeable sediments with wave‐driven pore water exchange

Precht, Elimar; Franke, Ulrich; Polerecký, Lùbos; Huettel, Markus

doi:10.4319/lo.2004.49.3.0693

Cited by 219 publications

(183 citation statements)

References 51 publications

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“…The setup and principles for planar optode oxygen measurements using the MOLLI system were previously described in detail in Holst et al (1998) and Holst and Grunwald (2001), and only the main features are outlined here. Optode foils were prepared several months in advance as described by Precht et al (2004) coating a polyethylene terephthalate (PET) foil with a~20-μm-thick sensing layer consisting of the luminophore, platinum(II) mesotetra (pentafluorophenyl) porphyrin (Frontier Scientific, Inc.), immobilized in a polystyrene matrix. The foils were stored in the dark until use.…”

Section: Planar Optode Studies Of Rhizosphere Oxygen Dynamicsmentioning

confidence: 99%

The Dynamics of Plant-Mediated Sediment Oxygenation in Spartina anglica Rhizospheres—a Planar Optode Study

Koop-Jakobsen

Wenzhöfer

2014

Estuaries and Coasts

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Belowground sediment oxygenation in rhizospheres of wetland plants promotes nutrient uptake, serve as protection against toxic reduced compounds and play an important role in wetland nutrient cycling. The presence of 1.5-mm-wide oxic zones around roots of the intertidal marsh grass Spartina anglica was demonstrated below the sediment surface using planar optode technology recording 2D images of the sediment oxygen distribution. Oxic root zones were restricted to the root tips stretching up to 16 mm along the roots with an oxygen concentration up to 85 μmol L −1 detected at the root surface. Radial oxygen loss across the root surface ranged from 250 to 300 nmol m −2 s −1 , which is comparable to other wetland plants. During air exposure of the aboveground biomass, atmospheric oxygen was the primary source for belowground oxygen transport, and light availability only had a minor effect on the belowground sediment oxygenation. During inundations completely submerging the aboveground biomass cutting off access to atmospheric oxygen, oxic root zones diminished significantly in the light and were completely eliminated in darkness. Within the time frame of a normal tidal inundation (~1.5 h), photosynthetic oxygen production maintained the presence of oxic root zones in light, whereas oxic root zones were eliminated within 1 h in darkness. The results show that the sediment oxygenation in Spartina anglica rhizospheres is temporally dynamic as well as spatially variable along the roots.

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Section: Planar Optode Studies Of Rhizosphere Oxygen Dynamicsmentioning

confidence: 99%

The Dynamics of Plant-Mediated Sediment Oxygenation in Spartina anglica Rhizospheres—a Planar Optode Study

Koop-Jakobsen

Wenzhöfer

2014

Estuaries and Coasts

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“…Oxygen sensitive foils (Glud et al 1996; prepared as described by Precht et al 2004) were attached to the inner side of the aquarium wall opposite the pressure sensors. Luminescence lifetime images with an effective pixel size of approximately 0.2 mm 2 were taken at 30 s intervals with a luminescence lifetime imaging system (see planar optode imaging below).…”

Section: Assessment Of Porewater Flow Patterns By Oxygen Imagingmentioning

confidence: 99%

Mechanical imitation of bidirectional bioadvection in aquatic sediments

Matsui¹,

Volkenborn²,

Polerecký³

et al. 2011

Limnology & Ocean Methods

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Measuring the effects of bioirrigating infauna on sediment properties and geochemistry is often problematic due to the unpredictable nature of the animal activity. This can be overcome by the use of mechanical systems that mimic bioirrigation in a controlled and reproducible manner. A realistic mimic must allow both qualitative and quantitative imitation of the complex infaunal activities, i.e., generate both positive and negative porewater pressure waveforms in a realistic range of amplitudes and frequencies using biologically realistic water volumes. We developed a mechanical irrigation system (Robolug) that meets these criteria and used it to mimic a set of specific hydraulic behaviors of the common lugworm Arenicola marina. The resultant porewater pressure waveforms had realistic shapes and amplitudes and were realized by pumping biologically realistic volumes of water. The porewater flow patterns at depth and at the sediment water interface, induced by bidirectional bioadvection, were comparable to those observed with live lugworms. Additionally, we were able to reproduce the formation of sedimentary cracks, a phenomenon also observed with real lugworms. The Robolug irrigation system is a promising tool for a wide range of biogeochemical and ecological studies, as it (1) allows the exploration of bio-hydraulically induced disruption of sediment integrity and transient geochemical conditions in a controlled and reproducible manner; (2) avoids the uncertainties of animal performance; (3) permits manipulative experimental conditions that could potentially be harmful for organisms or alter their behaviors; and (4) allows for the investigation of energy requirements associated with bio-hydraulic behaviors.

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“…Variability in a pH profile is, therefore, affected by temporal or spatial changes in site specific conditions. In particular, the grain size distribution, and permeability, which has a large effect on the depth and mechanism of transport of solutes in the sediment (Huettel and Rusch 2000;Huettel et al 2003;Precht and Huettel 2003;Precht et al 2004). Grain size also affects other parameters that are important for setting the geochemical zonations related to the processes listed above, such as organic carbon distribution, redox state and bioturbation (Huettel and Webster 2001;Volkenborn et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Benthic pH gradients across a range of shelf sea sediment types linked to sediment characteristics and seasonal variability

et al. 2017

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This study used microelectrodes to record pH profiles in fresh shelf sea sediment cores collected across a range of different sediment types within the Celtic Sea. Spatial and temporal variability was captured during repeated measurements in 2014 and 2015. Concurrently recorded oxygen microelectrode profiles and other sedimentary parameters provide a detailed context for interpretation of the pH data. Clear differences in profiles were observed between sediment type, location and season. Notably, very steep pH gradients exist within the surface sediments (10-20 mm), where decreases greater than 0.5 pH units were observed. Steep gradients were particularly apparent in fine cohesive sediments, less so in permeable sandier matrices. We hypothesise that the gradients are likely caused by aerobic organic matter respiration close to the sediment-water interface or oxidation of reduced species at the base of the oxic zone (NH 4 ? , Mn 2? , Fe 2? , S -). Statistical analysis suggests the variability in the depth of the pH minima is controlled spatially by the oxygen penetration depth, and seasonally by the input and remineralisation of deposited organic phytodetritus. Below the pH minima the observed pH remained consistently low to maximum electrode penetration (ca. 60 mm), indicating an absence of sub-oxic processes generating H ? or balanced removal processes within this layer. Thus, a climatology of sediment surface porewater pH is provided against which to examine biogeochemical processes. This enhances our understanding of benthic pH processes, particularly in the context of human impacts, seabed integrity, and future climate changes, providing vital information for modelling benthic response under future climate scenarios.

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Oxygen dynamics in permeable sediments with wave‐driven pore water exchange

Cited by 219 publications

References 51 publications

The Dynamics of Plant-Mediated Sediment Oxygenation in Spartina anglica Rhizospheres—a Planar Optode Study

The Dynamics of Plant-Mediated Sediment Oxygenation in Spartina anglica Rhizospheres—a Planar Optode Study

Mechanical imitation of bidirectional bioadvection in aquatic sediments

Benthic pH gradients across a range of shelf sea sediment types linked to sediment characteristics and seasonal variability

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