GEOG 3610 Lecture Notes - Lecture 8: Electrical Resistance And Conductance, Illuvium, Porosity
28 Mar 2018
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Document Summary
Residence time in soil= 15 days to 1 year. Critical to the hydrologic cycle: evapotranspiration, controls runoff, groundwater recharge, biogeochemical cycles, controls the distribution and physiology of vegetation, affects sensible and latent heat exchange with atmosphere. Topography: erosion is the process by which soil and rock particles are worn away and moved elsewhere by wind, water or ice. Weathering: breakdown of rocks at the earth"s surface, by the action of rainwater, extremes of temperature, and chemical and biological activity. 3 types: physical: e. g. freeze thaw, root growth, chemical: e. g. oxidation, reduction, solution, biological. Primary minerals: generally more resistive to chemical change and retain characteristics of parent (sands and silt) Secondary minerals: more reactive minerals gradually broken down (clay) A- strong mix of om and minerals. B- zone of illuviation (introduction of salts or colloids into one soil horizon from another by percolating water) layer of max accumulation.
