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2 edition of Microenvironmental modelling of redox chemistry in salt marsh sediments. found in the catalog.

Microenvironmental modelling of redox chemistry in salt marsh sediments.

Gavin Ruddy

Microenvironmental modelling of redox chemistry in salt marsh sediments.

by Gavin Ruddy

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  • 30 Currently reading

Published by University of East Anglia in Norwich .
Written in English


Edition Notes

Thesis (Ph.D.), University of East Anglia, School of Environmental Sciences, 1993.

ID Numbers
Open LibraryOL21712792M

Ecological Applications, 7(3), , pp. – q by the Ecological Society of America MONITORING PACIFIC COAST SALT MARSHES USING REMOTE SENSING M. ZHANG,1 S. L. USTIN,1,3 E. REJMANKOVA,2 AND E. W. SANDERSON1 1Department of Land, Air and Water Resources, University of California, Davis, California USA 2Division of Environmental Studies, . consider the redox chemistry of the groundwater. The same is true of data on the ability of the subsurface sediments to chemically reduce nitrate. Sediment chemistry The thickness and distribution of suitable clay cover layers above an aquifer plays a .

The addition of a sterilized, sludge‐based fertilizer to experimental salt marsh plots increased both the nitrogen and the heavy metal content of the surface sediment. Aerobic heterotrophic microorganisms collected from these plots differed from microbes collected from control plots in their oxygen uptake rates on a uniform sediment medium. The extended version of the salt marsh and sediment model was integrated in an ecological model (EcoWin, Ferreira, ) previously developed for the Tagus estuary. GIS tools and field data information collected for C 3 and C 4 species in the Tagus salt marsh were used to set up and calibrate the model. 2. Methodology Model concept.

Salt Mflrsh Cortltnliizitics Figure (A) Keenan Field marsh (Sapelo Island, Georgia). (E) Wrack cover in a New England marsh.(F) Feral horses graz- (n) Salt pan in a Sapelo Island marsh.(C) Oyster reefs in a ing on barrier island marshes. (korgia marsh. (D) Rumstick Cove marsh (Rhode Island). will respond to these changes, which sites are most at risk,File Size: 2MB. Sediment anoxia and associated low redox potential (Eh) are important influences on the distribution of saltmarsh plants. Nevertheless, the detailed variation of Eh in space and time is poorly understood, especially on managed realignment (MR) saltmarshes where anoxia may be a significant constraint on the establishment of characteristic perennial : Denis Skelly.


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Microenvironmental modelling of redox chemistry in salt marsh sediments by Gavin Ruddy Download PDF EPUB FB2

Measurements of O 2, Fe (II), Mn (II)and HS 5 in salt marshsediments in the Tagus Estuary, Portugal, made with a voltammetric microelectrode, reveal strong seasonal differences in pore water composition within the 20~cm deep root zone.

In spring, oxygen was below detection limit except close to the sediment by: Microenvironmental modelling of redox chemistry in salt marsh sediments.

Author: Ruddy, Gavin. (a) Sediment redox potential in planted plots with differing topographic treatments; (b) variation in redox potential with tidal height in experimental plots.

N = plots. Each data point is the mean of nine values per plot taken between June and October Cited by: 2. Mercury methylation in sediments of a riverine marsh: the role of redox conditions sulfur chemistry and microbial communities Article (PDF Available) January with 68 Reads How we measure.

THE CHEMISTRY of salt marsh sediments should be largely characterized, as in any sedimentary environ- ment, by the diffusion and flux of pore water ions Cited by:   Steep and fluctuating redox gradients in salt marshes Hobbie, J.

et al. Salt marsh sediment diversity: a test of the variability of the rare biosphere among environmental by:   Salt marsh sediments and autocompaction are discussed prior to a description of salt marsh accretion models.

The latter is used to give examples of salt marsh stability in relation to different tidal conditions and sea-level-rise scenarios. The chapter concludes with a description of salt marshes in the geological by: tial of salt marsh sediments at sites that model specific ion meter which re- corded the measured potentials (mV).

The platinum electrodes were inserted from the surface to the proper depths and allowed to equilibrate for I5 min before Salt marsh redox potentials i5 30 Fig.

by: A gold−mercury amalgam microelectrode was used in situ to measure Pb(II) by anodic stripping voltammetry and O2, Fe(II), Mn(II), and HS- by square-wave voltammetry in sediment pore water in a Haliomione portulacoides stand in a Tagus estuary salt marsh.

The measurements were made in spring, summer, and fall, and were supplemented with analysis of Pb in solid phases and stable isotope Cited by: The goals for this research were to (1) determine if salt marsh sediment bacterial communities show extrinsically controlled synchronous patterns that exist across all salt marsh habitats or if.

Abstract. Mitigation of petroleum hydrocarbons was investigated during a 5-month greenhouse experiment, to assess the rhizoremediation (RR) potential in sediments with different characteristics colonized by Juncus maritimus, a salt marsh plant commonly found in temperate rmore, the efficiency of two bioremediation treatments namely biostimulation (BS) by the addition of.

Abiotic control modelling of salt marsh sediments respiratory CO 2 fluxes: Application to increasing temperature scenarios Article in Ecological Indicators – November with Reads.

The growth (or decay) of salt marshes depends on suspended-sediment flux into and out of the marsh. Suspended-sediment concentration (SSC) is a key element of the flux, and SSC-based metrics reflect the long-term sediment-flux trajectories of a variety of salt marshes.

One metric, the flood–ebb SSC differential, correlates with area-normalized sediment flux and can indicate salt-marsh Cited by: 2. Redox Chemistry of Hydric Soils.

with changes in sediment oxidation-reduction potential resulting in a rapid sediment color shift The soils of the salt marsh may be considered a sink for. Modeling Nutrient Availability in Salt Marsh Soil of salt marsh ecosystems. We approximated the soil solution in salt marshes by a standard seawater composition and a simulated model for.

Simple Metrics Predict Salt-Marsh Sediment Fluxes Daniel J. Nowacki1 and Neil K. Ganju2 1U.S. Geological Survey, Santa Cruz, including the elevation-based Marsh Equilibrium Model (e.g., Byrd et al., ; Schile et al., ) and WARMER models (Swanson et Cited by: 2.

Physicochemical (organic matter content, relative humidity, humic acid content, carbon, nitrogen and phosphorous content) and microbiological activities (extracellular enzymatic activities, basal and substrate induced respiration and bioenergetical parameters) were evaluated in salt marsh degraded sediments, during a 1 year revegetation trial starting at the end of the growing by:   The relationships between sediment redox potential and (a) elevation relative to UK reference mean sea level (ODN); and (b) gravimetric sediment water content at Brancaster managed realignment salt marsh, Norfolk, in (r s = −, P Cited by: Production and dynamics of experimentally enriched salt marsh vegetation: Belowground biomass1 Ivan Valiela Boston University Marine Program, Marine Biological Laboratory, Woods IIole, Massachusetts John M.

Teal and Norma Y. Persson Woods Hole Oceanographic Institution, Woods Hole, Massachusetts Cited by: Variation of electrochemical oxidation-reduction (redox) potential was examined in surface salt march sediments under conditions of flooding and tidal simulation in mesocosms and field sites.

Time series were generated of redox potential measured in sediment profiles at cm depth using combination Pt-Ag/AgCl (ORP) electrodes. Redox potential data were acquired at rapid rates ( samples. Finally, because much of the recent salt marsh modeling work has been in response to concerns regarding the effects of rising sea levels on salt marsh evolution and resilience [Kirwan et al., ], we review how numerical models have been used to determine the fate of salt marshes under different scenarios of sea level rise.Abstract.

Belowground growth in coastal plants is critical for marsh stability and the ability of coastal wetlands to keep pace with sea‐level rise. Quantifying the effects of nutrient loading on belowground plant growth is an ongoing controversy in wetland research, with previous experiments demonstrating both positive and negative by: 8.Experiment-supported modelling of salt marsh establishment Applying the Windows of opportunity concept to the Marconi pioneer salt marsh design By D.W.

(DAAN) POPPEMA In partial fulfilment of the requirements for the degree of Master of Science in Water Engineering and Management at the University of Twente June Delft.