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Reacts with fe al ca and clay minerals decomposion of

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Unformatted text preview: eached from soils –  Minor: ammonium ion (NH4+) Phosphorus Sources to soils Losses to rivers •  No important atmospheric gas phases •  Main sources: •  Main form of loss: –  Natural: •  Weathering of P- containing minerals (primary mineral apa:te) •  Dissolved inorganic P (PO4 3- ; HPO4 2- ; H PO - ) referred to as 2 4 orthophosphate •  Immobilized in soils (reacts with Fe, Al, Ca and clay minerals) •  Decomposi:on of organic maSer releases (PO4 3- ) –  Mining for inorganic fer:lizer P (PO4 3- ), detergents, sewage, sep:c, industrial sources –  Minor: Dissolved •  inorganic P (orthophosphate) •  organic P –  Major: Par:culate   Par:culate inorganic P (orthophosphate ‘locked up/ occluded’ in minerals OR adsorbed to mineral surfaces) •  Par:culate organic P –  Measure of ‘bioavailable P’ of greatest interest •  Dissolved ortho- P •  Exchangeable mineral adsorbed P Excess of nutrients •  Increased nutrients (nitrogen and phosphorus) increases organic maSer growth •  These nutrients are normally limi:ng growth in aqua:c systems •  Resul:n...
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