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Chapter 4

Ch4 Variation in the Environment10.pdf

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Podsolization  in the temperate zone (mild temps., moderate precipitation), sand grains and clay particles resist weathering and form stable components of the soil  podsolization occurs in acidic soils in cool, moist regions of the temperate zone when clay particles in the E horizon break down and their soluble ions are transported downward and deposit in the lower B horizon  usually occurs in regions where rainfall exceeds evaporation  b/c water continuously moves downward, little clay-forming material is transported upward  acidic soils occur in cool regions dominated by needle-leaved trees  slow decomposition of the needles produce organic acids which promote high conc. of H ions  highly podsolized soil profile:  A: dark, rich in organic matter  E: light-coloured, leached of clay (region of eluviation), consists mainly of sandy material 2+ 3+  B: dark band, Fe and Al oxides are redeposited here (region of illuviation)  C,R: more mobile minerals Laterization  soil in warm, humid climates weather (tropics, subtropics) to great depths 4+ 
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