Download - Phosphorus Cycling -Limnology, Wetzel, RG
Chuck Hansen 3.7.13
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
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
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
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….
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
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