A model of phosphorus cycling to explore the role of biomass turnover in submerged aquatic vegetation wetlands for Everglades restoration

Juston, John; DeBusk, Thomas A.; Grace, Kevin A.; Jackson, Scott D.

doi:10.1016/j.ecolmodel.2012.12.001

Cited by 27 publications

(19 citation statements)

References 53 publications

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“…Weathering behavior in wetland situations may also be represented by a TIS model, where the hydraulic parameter (N) is relaxed to become a fitting parameter (see Equation (1)). Applications of this model for large constructed P wetlands may be found in, for instance, Kadlec et al (2011) [28] and Juston et al (2013) [74], and it is used in this work.…”

Section: Speciationmentioning

confidence: 99%

“…As an example, TP was measured on transects on 20 occasions over a span of four years, along five parallel paths in STA2 [74]. The average coefficient of variation perpendicular to flow was 25%.…”

Section: Internal Behavior Of the Stasmentioning

confidence: 99%

“…Such early misconceptions ignored the soil building that occurs in treatment wetlands, and were subsequently supplanted by acknowledgement of the sustainable P There is also spatial variability between parallel transects across the flow direction. As an example, TP was measured on transects on 20 occasions over a span of four years, along five parallel paths in STA2 [74]. The average coefficient of variation perpendicular to flow was 25%.…”

Section: Sustainability and Time Trendsmentioning

confidence: 99%

“…The contribution of SAV in STA2C3 has been calibrated at about one-third of the total C* [74]. The submerged aquatic vegetation phosphorus model (SAVPM) is a steady state model patterned after the PkC* model, but additionally containing interacting compartments for biomass, recently accreted sediments, and underlying soils [74]. The model was calibrated and exercised for STA2C3, an SAV wetland.…”

Section: Including Solid Compartmentsmentioning

confidence: 99%

“…Periodically, many of the STAs have been sampled internally for water quality, on grids that extend both parallel to flow and cross flow ( [48,[72][73][74]). This information is vitally useful in understanding STA performance.…”

Section: Internal Behavior Of the Stasmentioning

confidence: 99%

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Large Constructed Wetlands for Phosphorus Control: A Review

Kadlec¹

2016

Water

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This paper reviews aspects of the performance of large (>40 ha) constructed treatment wetlands intended for phosphorus control. Thirty-seven such wetlands have been built and have good data records, with a median size of 754 ha. All are successfully removing phosphorus from a variety of waters. Period of record median concentration reductions were 71%, load reductions 0.77 gP¨m´2¨year´1, and rate coefficients 12.5 m¨year´1. Large wetlands have a narrower performance spectrum than the larger group of all sizes. Some systems display startup trends, ranging to several years, likely resulting from antecedent soil and vegetation conditions. There are internal longitudinal gradients in concentration, which vary with lateral position and flow conditions. Accretion in inlet zones may require attention. Concentrations are reduced to plateau values, in the range of about 10-50 mgP¨m´3. Vegetation type has an effect upon performance measures, and its presence facilitates performance. Trends in the performance measures over the history of individual systems display only small changes, with both increases and decreases occurring. Such trends remove little of the variance in behavior. Seasonality is typically weak for steady flow systems, and most variability appears to be stochastic. Stormwater systems display differences between wet and dry season behavior, which appear to be flow-driven. Several models of system performance have been developed, both steady and dynamic.

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Section: Speciationmentioning

confidence: 99%

Section: Internal Behavior Of the Stasmentioning

confidence: 99%

Section: Sustainability and Time Trendsmentioning

confidence: 99%

Section: Including Solid Compartmentsmentioning

confidence: 99%

Section: Internal Behavior Of the Stasmentioning

confidence: 99%

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Large Constructed Wetlands for Phosphorus Control: A Review

Kadlec¹

2016

Water

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Comment on “Spatial and temporal phosphorus distribution changes in a large wetland ecosystem” by X. Zapata‐Rios et al.

Juston

DeBusk²,

Jerauld³

et al. 2014

Water Resources Research

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Persistence of legacy soil P and elevated background water P concentrations in Water Conservation Area 2A, a northern Everglades wetland

Juston

Kadlec²,

DeBusk³

et al. 2015

Water Resources Research

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Upstream source control and Stormwater Treatment Areas (STAs) have reduced phosphorus (P) loads to Water Conservation Area 2A (WCA-2A), a northern Everglades wetland, by three quarters since year 2000. Nevertheless, large storages of P remain in enriched peat soils and it is unclear how legacy stores will impact spatial and temporal scales of recovery. We remeasured soil P enrichment along a well-studied eutrophication gradient in WCA-2A and applied a profile modeling approach with uncertainty analysis to assess changes in longitudinal soil P gradients 13 years after load reductions. We then analyzed existing internal water P data, using a novel data screening approach, for evidence of lowest possible water P concentrations independent from inflows. We interpret such water P limits as evidence of the strength of internal loading at a location. Results indicate that soil P enrichment persists in the 7.5 km long ''impacted'' zone, with no significant evidence of net advancement or recession, while a large pool of labile P in the flocculent layer consolidated and diminished. There is indeed evidence, both spatial and temporal, that this extensive zone of enriched soil P continues to elevate lowest achievable water P concentrations. The corresponding gradient of elevated water P limits is both receding and diminishing since load reductions, thus providing further evidence toward recovery. However, results also suggest that these ''transitory P limits'' due to internal loading are likely to persist for decades above water quality targets. These results advance our understanding of recovery in impacted wetlands and are relevant to Everglades restoration.

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A model of phosphorus cycling to explore the role of biomass turnover in submerged aquatic vegetation wetlands for Everglades restoration

Cited by 27 publications

References 53 publications

Large Constructed Wetlands for Phosphorus Control: A Review

Large Constructed Wetlands for Phosphorus Control: A Review

Comment on “Spatial and temporal phosphorus distribution changes in a large wetland ecosystem” by X. Zapata‐Rios et al.

Persistence of legacy soil P and elevated background water P concentrations in Water Conservation Area 2A, a northern Everglades wetland

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