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Unformatted text preview: • C:N ratio of OM decreases with time and decomposition 10 Ammonia volatilization • Loss of N in form of ammonia gas NH 4 + + OH-Æ NH 3 (g) + H 2 11 Ammonium fixation • NH 4 + becomes “fixed” in certain layer silicate minerals – related to cation exchange • Weathered micas, vermiculite • Mineral must weather again to release ammonium 3 12 Nitrate leaching • Because NO 3-not retained on CE complex • Eutrophication 13 Runoff • NH 4 + enters surface waters – Attached to soil particles – Fertilizer particles • Eutrophication 14 Eutrophication • Nutrients (such as N, P) added to surface waters in higher-than-natural quantities • excessive growth or "blooms" of algae algal blooms Æ to oxygen depletion Æ fish kills 15 Eutrophic lakes...
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This note was uploaded on 04/03/2008 for the course SS 121 taught by Professor Staff during the Winter '07 term at Cal Poly.
- Winter '07