Phosphorus Cycling -Limnology, Wetzel, RG
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Transcript of Phosphorus Cycling -Limnology, Wetzel, RG
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Chuck Hansen 3.7.13
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Dissolved Inorganic Phosphorus (DIP) aka Soluble Reactive Phosphorus (SRP)
Disolved Organic Phosphorus (DOP) Particulate Phosphorus (PP) Total P = DIP + DOP + PP Found in the form of Phosphates (PO4
-3) Important to plants, animals, and
microbiota Growth – Limiting Nutrient
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Weathering of ApatitePoint Sources
Sewage, Urban RunoffNonpoint Sources
Agriculture, Animal Waste, FertilizersModes of Entry to Aquatic Systems
Precipitation (dust in air), Groundwater Adsorption, Surface Runoff
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Decreases Downstream
Can occur faster than needed for growth
Rate of uptake dependant upon how much organic matter there is to take it in, and the metabolism of those constituents
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How does the solubility of Fe influence the phosphorus redox reactions? As a result, explain how sulfur and iron trapping influences the concentration of phosphorus in the hypolimnion at overturn in a lake.
Others….
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Iron trap for P - In oxygenated
waters, iron is present as Fe3+ (ferric)
pH < 7 : Fe3+ + PO43-
: FePO4 (Vivianite) pH > 7 : Fe3+ + PO4
3- + OH- : Fe2, OH, PO4
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Fe3+ conversion to Fe2+ releases PO4
3- Sulfur trap may lower iron
concentrations enough to allow some phosphate to remain at overturn
All these reactions mediated by bacteria