Internal phosphorus loading rate (iPLR) in a low-P stormwater treatment wetland

Jerauld, Mike; Juston, John; DeBusk, Tom; Ivanoff, Delia; King, J. W. B.

doi:10.1016/j.ecoleng.2020.105944

Cited by 13 publications

(4 citation statements)

References 55 publications

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“…Similar trends were also reported in WCA-2A with a shift from P limitation to N limitation in periphyton, plant tissue, and surface soils in the upstream areas (Inglett et al 2004(Inglett et al , 2008. Upstream areas with low N/P ratios in biotic components suggest potential P surplus or P saturated conditions in floc and RAS, which resulted in the accumulation of labile (unstable) P pools creating conditions for internal P loading or flux into water column and transport to downstream (Fisher and Reddy 2001, Jerauld et al 2020, Reddy et al 2020.…”

Section: Accumulation Of Macro-elementssupporting

confidence: 77%

Long‐term accumulation of macro‐ and secondary elements in subtropical treatment wetlands

Reddy

Villapando

et al. 2021

Ecosphere

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The Everglades Stormwater Treatment Areas (STAs) are a complex of large constructed wetlands that are an integral component of the State and Federal efforts to restore the Everglades ecosystem. The overall objective of this study was to determine the accumulation rates of macro-elements including carbon (C), nitrogen (N), phosphorus (P), sulfur (S), and associated secondary elements including calcium (Ca), magnesium (Mg), aluminum (Al), and iron (Fe) in two Everglades STAs over their periods of operation. The study was conducted in STA-2 with parallel flow-ways consisting of emergent aquatic vegetation (EAV) and submerged aquatic vegetation (SAV) and the Western flow-way of STA-3/4 with EAV and SAV cells operated in series. Elemental accumulation rates were determined in the unconsolidated surficial sediments (floc) and recently accreted soil (RAS) that have accumulated on top of the antecedent soil over the 14-and 10-yr periods of operation for STA-2 and STA-3/4, respectively. Flow-ways with SAV were more efficient than EAV in accreting mineral matter, resulting in increased bulk density and higher accumulation rates of elements. Average C accumulation in the floc and RAS of SAV flow-ways was 320 gÁm −2 Áyr −1 with approximately equal proportions of inorganic and organic C, while in the EAV flow-ways accumulation rates of C ranged from 116 to 147 gÁm −2 Áyr −1 with mostly organic C. Phosphorus accumulation rates were approximately 2-3 times higher in SAV than in EAV flow-ways. Differences in accumulation of elements between SAV and EAV were largest for Ca with 17-42 times more Ca in SAV than EAV systems. This suggests that in the SAV systems, possible occlusion of macro-elements and metals during CaCO 3 precipitation facilitated accretion of material with high mineral content. In EAV, biomass turnover and associated biotic processes regulated organic matter accumulation rates. The spatial accumulation patterns of P, C, and N in the EAV areas of STA-2 and STA-3/4 were similar to those observed in the EAV areas of the natural wetlands in Water Conservation Areas, suggesting that constructed wetland systems function similarly to natural wetlands dominated by EAV areas in retaining and storing macro-and secondary elements.

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Section: Accumulation Of Macro-elementssupporting

confidence: 77%

Long‐term accumulation of macro‐ and secondary elements in subtropical treatment wetlands

Reddy

Villapando

et al. 2021

Ecosphere

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“…In STA-2 ow-way 3, the shift of P source to P sink (Fig. 7) is also re ected in the aggregated internal load reported in a recent study that demonstrated internal loading can be a substantial contributor to water column P concentrations, especially at in ow regions of the ow-way (Jerauld et al 2020).…”

Section: Sink-source Dynamicssupporting

confidence: 55%

Seal Tightly and Store in a Cool Dry Place: Exploring Soil Phosphorus Storage in a Subtropical Treatment Wetland.

Julian

Osborne

Nair

2021

Preprint

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Oligotrophic wetlands of the Everglades are often the final recipients of nutrients from adjacent ecosystems and tend to accumulate phosphorus (P) in their soils. Understanding P source and sink dynamics in wetlands are critical for managing wetland ecosystems and protecting downstream resources. In this study, soil P storage capacity (SPSC) was evaluated within two treatment flow-ways of the Everglades Stormwater Treatment Areas (STAs). This study hypothesized that SPSC will vary between flow-ways, soil depth, and spatially along the inflow-to-outflow gradient. The P storage capacity in the STAs depend on the proportion of iron, aluminum, calcium, and magnesium (Fe, Al, Ca, and Mg, respectively) to P with floc and recently accreted soils (RAS) being associated more with Ca and Mg and pre-STA soils being associated more with Fe and Al. Phosphorus loss, as indicated from SPSC values would vary between systems and soil depths suggesting a variable condition of P sink and source within and along flow-ways. This result, while limited, demonstrates the applicability of SPSC to wetlands systems and provides information that will aid operational or management decisions associated with improving P retention of the Everglades STAs.

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“…In STA-2 flow-way 3, the shift of P source to P sink (Fig. 7) is also reflected in the aggregated internal load reported in a recent study that demonstrated internal loading can be a substantial contributor to water column P concentrations, especially at inflow regions of the flowway (Jerauld et al 2020). Phosphorus concentration within a given STA flow is the sum of loading…”

Section: Sink-source Dynamicsmentioning

confidence: 65%

“…In EAV dominant organic soil flow-ways, organic processes could be the controlling factor in iPLR and potentially contributing less to local P loading conditions (Fig7) and ultimately outflow P concentrations. While in SAV dominant mineral soil flow-ways inflow PLR vs iPLR processes occur similarly, however it is possible that iPLR has a greater effect on outflow TP concentrations in these systems(Jerauld et al 2020). The potential iPLR pressure at the mid to end of these flow-ways is concurrent with the relative change in TSPSC values observed in STA-2 flow-way 3.…”

mentioning

confidence: 94%

Tug of war between source and sink dynamics, evaluating soil phosphorus storage in a subtropical treatment wetland.

Julian,

Osborne,

NAir

2024

Preprint

View full text Add to dashboard Cite

Oligotrophic wetlands of the Everglades are often the final recipients of nutrients from adjacent ecosystems and tend to accumulate phosphorus (P) in their soils. Understanding P source and sink dynamics in wetlands is critical for managing wetland ecosystems and protecting downstream resources. This study evaluated the soil P storage capacity (SPSC) of the mineral components within two treatment flow-ways of the Everglades Stormwater Treatment Areas (STAs). We hypothesized that SPSC will vary between flow-ways, with soil depth, and spatially along the inflow-to-outflow gradient. The P storage capacity in the STAs depends on the proportion of iron, aluminum, calcium, and magnesium (Fe, Al, Ca, and Mg, respectively) to P. We determined floc and recently accreted soils (RAS) are associated more with Ca and Mg and pre-STA soils are associated more with Fe and Al. Phosphorus loss, as indicated from SPSC values would vary between systems and soil depths suggesting a variable condition of P sink and source within and along flow-ways. This result, while limited, demonstrates the applicability of SPSC to wetlands systems and provides information that will aid operational or management decisions associated with improving P retention of the Everglades STAs.

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Internal phosphorus loading rate (iPLR) in a low-P stormwater treatment wetland

Cited by 13 publications

References 55 publications

Long‐term accumulation of macro‐ and secondary elements in subtropical treatment wetlands

Long‐term accumulation of macro‐ and secondary elements in subtropical treatment wetlands

Seal Tightly and Store in a Cool Dry Place: Exploring Soil Phosphorus Storage in a Subtropical Treatment Wetland.

Tug of war between source and sink dynamics, evaluating soil phosphorus storage in a subtropical treatment wetland.

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