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- W3046604116 abstract "Low-phosphorus (P) wetland discharges (e.g., < 20 μg/L), such as those now commonly observed in Stormwater Treatment Areas (STAs) for Everglades restoration, are likely influenced by internal P loads. This study estimated for the first time the “aggregated” internal P loading rate (iPLR) (including soil and biotic vectors) in a low-P treatment wetland along with calculated vertical soil diffusive fluxes. In situ mesocosms (1.5-m diameter polyethylene cylinders) equipped with closeable windows were deployed at three locations in an STA, enclosing parcels of local vegetation and soil. The mesocosms isolated the water column P response from longitudinal P transport (flow) so the local soil-water-biota P dynamics and equilibria could be observed during no-flow conditions. The water column inside and outside the mesocosms was sampled at each location during three two-week no-flow batch incubations. A first-order model was calibrated to mesocosm batch reaction time series to estimate the iPLR (with uncertainty) at each study site. Soil diffusive flux rates were estimated from vertical porewater P concentration profiles measured at each site. Results showed that: 1) strong gradients in water column equilibrium P concentrations existed along the direction of flow (92–20 μg/L from inflow to outflow), 2) a corresponding gradient also existed for model-predicted iPLR (~6.6 to 1.9 mg/m2-d), 3) these aggregated internal loads were more than 20× greater than calculated soil diffusive fluxes, and 4) an annual extrapolation suggested that average iPLR could be approximately equivalent to the average annual inflow P loading rate to the wetland (1.3 g/m2-yr). This study demonstrates that aggregated internal P loading can greatly exceed more commonly estimated vertical soil diffusive fluxes in low-P wetlands and can be a substantial contributor to water column P concentrations. Furthermore, measuring and modeling water P equilibria during no-flow intervals was a useful method to estimate internal loading in these wetlands." @default.
- W3046604116 created "2020-08-07" @default.
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- W3046604116 date "2020-09-01" @default.
- W3046604116 modified "2023-09-27" @default.
- W3046604116 title "Internal phosphorus loading rate (iPLR) in a low-P stormwater treatment wetland" @default.
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- W3046604116 doi "https://doi.org/10.1016/j.ecoleng.2020.105944" @default.
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