30 Mar 2011
School
Department
Course
Professor
Geography Lecture
March 29, 2011
Soil
Pedogenic processes (internal)
Ground water can come upwards
Translocation
Eluviation: downward transport of fine particles from the Ae horizon
External controls on pedogenesis
Climate
Vegetation
Parent material/local geology
Relief/topography
Time
Drainage is important
Climate
More water= more leeching
The more rain you have, you will have bigger differences between the
horizons
Hotter temperature = increased chemical reactions
Vegetation
Composition of the vegetation
Ex. Tree bark is more resistant (more fibrous) to decomposition than
grasses
Grassland soils have deep organic trasloation
Coniferious needles -> acid soils
Parent material
Minerals vary in their resistance to weathering
Rocks vary in their chemical composition
Texture of unconsolidated sediments
Relief
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