Lect_16_P_mgt

Lect_16_P_mgt - Lecture 16: P cycling and lake management P...

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Lecture 16: P cycling and lake management P cycling Central role of P in lake management The well-mixed reactor model Internal loading and lake remediation P and trophic status
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REDOX potentials above and below sediment surface (note vertical scale) Lake Windermere- a limnological classic Water chemistry in water column above sediments Windermere remains aerobic and REDOX relatively high at sediment surface Phosphate (PO 4 3- ) mainly bound by Fe-O-OH colloids and unavailable
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Eutrophic Esthwaite Water- a different story Oxidized microzone breaks down, with low REDOX at sediment surface PO 4 3- appears as oxygen (and REDOX) decrease Simultaneously, Fe 2+ appears and NH 4 + accumulates The “classical” model of P cycling
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Trouble for the classical model: sulfur Higher sulfate means less iron, due to binding in insoluble FeS compounds Supply of iron relative to P also decreases as sulfate increases, favouring increased P solubility Therefore sulfate AND sulfate reducing bacteria must be considered an
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This note was uploaded on 07/10/2010 for the course BIOL 351 taught by Professor Ralphsmith during the Winter '10 term at Waterloo.

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Lect_16_P_mgt - Lecture 16: P cycling and lake management P...

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