Environmental factors affecting temporal and spatial patterns of soil redox potential in Florida Everglades wetlands

Thomas, Cassondra R.; Miao, ShiLi; Sindhöj, Erik

doi:10.1672/08-234.1

Cited by 39 publications

(43 citation statements)

References 21 publications

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“…The major factors controlling carbon-release in peatlands and wetlands are organic-matter quality and hydrological conditions (Jauhiainen et al, 2005) that greatly influence nutrient availability (DeBusk and Reddy, 1998), oxidation-reduction potential (Thomas et al, 2009), and microbial community composition and activity (Bowling et al, 2002). In situ CO 2 efflux measurements are often the combination of heterotrophic and autotrophic respiration, which varies with plant species and other phenological factors (Tang et al, 2003).…”

Section: Soil Carbon Effluxmentioning

confidence: 99%

“…Frequent drying and wetting cycles have been proposed to limit methanogenic conditions necessary for methane production in wetlands (Knorr and Blodau, 2009). Investigations into how hydrology influences oxidationreduction with CO 2 and CH 4 can ultimately provide understanding in C storage (Thomas et al, 2009). …”

Section: Hydrologymentioning

confidence: 99%

“…Oxidation-reduction (redox) potential of wetland and peatland soils is important as an indicator of functions and processes occurring on multiple scales (Thomas et al, 2009). Saturation, or flooding, of soils limits the availability of oxygen (DeBusk and Reddy, 2003) because oxygen diffuses slower through water than through air, estimated at 10,000 times slower (Mitsch and Gosselink, 2007).…”

Section: Oxidation-reductionmentioning

confidence: 99%

“…Saturation, or flooding, of soils limits the availability of oxygen (DeBusk and Reddy, 2003) because oxygen diffuses slower through water than through air, estimated at 10,000 times slower (Mitsch and Gosselink, 2007). Understanding redox potential aids understanding of C storage (Thomas et al, 2009). Soils with freely dissolved oxygen have redox potentials between +400 and +700 millivolts (mV) and are considered aerobic.…”

Section: Oxidation-reductionmentioning

confidence: 99%

“…Methanogenesis, or the production of CH 4 , only occurs at redox potentials below -200 mV (Mitsch and Gosselink, 2007). Redox potentials increase either linearly or exponentially with exposure to oxygen depending on marsh type and nutrient availability (Thomas et al, 2009). …”

Section: Oxidation-reductionmentioning

confidence: 99%

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Soil Carbon Dioxide and Methane Efflux From an Everglades Tree Island and Ridge Landscape

Schroeder¹

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The influence water levels have on CO 2 and CH 4 efflux were investigated at the Loxahatchee Impoundment Landscape Assessment (LILA) research facility, located in Boynton Beach, FL, USA. Measurements of CO 2 efflux were taken for 24 h periods four times for one year from study plots. Laboratory incubations of intact soil cores were sampled for CO 2 , CH 4 , and redox potential. Additionally, soil cores from wet and dry condition were incubated for determination of enzyme activity and macronutrient limitation on decomposition of organic matter from study soils. Water levels had a significant negative influence on CO 2 efflux and redox, but did not significantly influence CH 4 efflux. Study plots were significantly different in CH 4 efflux and redox potential.Labile carbon was more limiting to potential CO 2 and CH 4 production than phosphorus, with the effect significantly greater from dry conditions soils. Enzyme activity results were variable with greater macronutrient responses from dry condition soils.

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Section: Soil Carbon Effluxmentioning

confidence: 99%

Section: Hydrologymentioning

confidence: 99%

Section: Oxidation-reductionmentioning

confidence: 99%

Section: Oxidation-reductionmentioning

confidence: 99%

Section: Oxidation-reductionmentioning

confidence: 99%

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Soil Carbon Dioxide and Methane Efflux From an Everglades Tree Island and Ridge Landscape

Schroeder¹

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Spectral analysis of continuous redox data reveals geochemical dynamics near the stream–aquifer interface

Wallace

Sawyer

Barnes

2018

Hydrological Processes

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Changes in streamflow and water table elevation influence oxidation–reduction (redox) conditions near river–aquifer interfaces, with potentially important consequences for solute fluxes and biogeochemical reaction rates. Although continuous measurements of groundwater chemistry can be arduous, in situ sensors reveal chemistry dynamics across a wide range of timescales. We monitored redox potential in an aquifer adjacent to a tidal river and used spectral and wavelet analyses to link redox responses to hydrologic perturbations within the bed and banks. Storms perturb redox potential within both the bed and banks over timescales of days to weeks. Tides drive semidiurnal oscillations in redox potential within the streambed that are absent in the banks. Wavelet analysis shows that tidal redox oscillations in the bed are greatest during late summer (wavelet magnitude of 5.62 mV) when river stage fluctuations are on the order of 70 cm and microbial activity is relatively high. Tidal redox oscillations diminish during the winter (wavelet magnitude of 2.73 mV) when river stage fluctuations are smaller (on the order of 50 cm) and microbial activity is presumably low. Although traditional geochemical observations are often limited to summer baseflow conditions, in situ redox sensing provides continuous, high‐resolution chemical characterization of the subsurface, revealing transport and reaction processes across spatial and temporal scales in aquifers.

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Heterogeneous oxygenation of wetland soils with increasing inundation: Redox potential, water depth, and preferential flow paths

Lahiri

Davidson

2020

Hydrological Processes

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Saturated wetland soils are typically depleted in oxygen due to rapid consumption by biological processes. Fine‐grained sediments limit the vertical flux of oxygenated surface water. In forested wetlands potential exists for advective transport along preferential flow pathways created by decomposing roots or tree remains, resulting in isolated zones of oxygenated pore water. This potential is enhanced in wetlands that are perched above the regional water table, where increases in surface‐water depth create significant downward hydraulic gradients. Along the Mississippi River floodplain, many wetlands are now perched as a result of groundwater mining. This study was conducted at Sky Lake, MS, through a growing season, with high temporal‐resolution monitoring of redox potential as a proxy for the delivery of oxygenated surface water at 30 and 60 cm depths at six locations. Results showed reducing conditions at all locations under moderate inundation, but redox potential rose significantly at a subset of locations when surface‐water exceeded one meter in depth. Rising redox potential is argued to represent localised advective transport of oxygen in excess of the rate of biological consumption. Wetland plants growing in perennially saturated soils may benefit from periodic increases in water depth and subsequent increase in the flux of oxygen along preferential flow paths.

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Environmental factors affecting temporal and spatial patterns of soil redox potential in Florida Everglades wetlands

Cited by 39 publications

References 21 publications

Soil Carbon Dioxide and Methane Efflux From an Everglades Tree Island and Ridge Landscape

Soil Carbon Dioxide and Methane Efflux From an Everglades Tree Island and Ridge Landscape

Spectral analysis of continuous redox data reveals geochemical dynamics near the stream–aquifer interface

Heterogeneous oxygenation of wetland soils with increasing inundation: Redox potential, water depth, and preferential flow paths

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