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Lecture 48

GEOG 1280 Lecture 48: Lecture 48

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GEOG 1280
Bruce G.Erickson

Oc78 Parent Material Bedrock to Regolith, (in place, glaciers etc. where does the parent come from) transported materials Topography (relief) Site conditions affects moisture characteristics and erosion Soil drainage Relief Time Soil evolution Pedogenesis or soil evolution (formation) is the process by which soil is created. Factors Controlling Soil Formation s= f (cl, o, r, p, t) , descriptive equation o s soil properties o cl regional climate o o potential biota (organisms) o r topography (relief) o p parent material o ttime Soil are characterized by texture by the amount () of sand, silt and clay. You cant sieve clay, so you take the finest materials and calculate the amount of clay through evaporation etc. You can also measure the pH of the soil, most soils are neutral (humid are slightly acidic (less than 7) and arid are more alkaline (greater than 7)). Soil structure is related to Soil Texture Blocky, Granular, Prismatic, Platy
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