T11+Slides

T11+Slides - Gaseous Inputs/Outputs Atmospheric Deposition...

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1 Cation/Anion Exchange Capacity Exchangeable Cations/Anions Microbes Litter Soil Organic Matter Vegetation Mycorrhizae Decomposition Soil Solution Primary minerals Secondary minerals Weathering Synthesis Litterfall U p t a k e Sorbed S o rp tio n D so Leaching Exchangeable Ions Exchange Im m b iliz M in ra liz L f w s h E x u d Gaseous Inputs/Outputs Atmospheric Deposition Wet Dry Atmosphere Biosphere Geosphere Hydrosphere Basic concepts Cations - positive charge (calcium: Ca 2+ ) Anions - negative charge (nitrate: NO 3 - ) Opposite charges attract; like charges repel Origin of Charges on Soil Particles Clay minerals permanent charge pH dependent charge positive and negative charges negative charges are most abundant Soil organic matter pH dependent charge only negative charges Permanent Charge (Isomorphous substitution) Si 2 O 4 Si 4+ x 2 = +8 O 2- x 4 = -8 Net charge = 0 SiAlO 4 Si 4+ x 1 = +4
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This note was uploaded on 01/27/2011 for the course SSO 10 taught by Professor Randydahlgren during the Fall '10 term at UC Davis.

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T11+Slides - Gaseous Inputs/Outputs Atmospheric Deposition...

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