FORS-2106EL Study Guide - Quiz Guide: Parent Material, Podzol, Soil Texture
27 Jun 2018
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FORS-2106 - Lab 5 Quiz Review
-bigger then 2 mm particles is gravel and stones
-smaller then 2 mm particles is fine earth
-International analysis of fine earth
-course sand: 2-0.2 mm
-fine sand: 0.2-0.02 mm
-silt: 0.02-0.0002 mm
-clay: <0.0002 mm (2u)
-less then 2u has colloidal
-particles from aggregates (meaning they don’t exist alone) are peds or crumbs
properties of soil
-texture is the particle distribution
-can be mechanically analyzed through sedimentation/decantation (sand), pipette
method (fine sand, clay, silt), or hydrometer (silt and clay)
-structure
-the way the particles are held together into peds
-types of peds:
-spheroidal (rounded)
-platy (plate like)
-prism like
-block like
-and they can all be strong, intermediate, or weak
-microscopic analysis is called micropedology
-look at raw soil, impregnate it with resin, make thin sections, see micro-crumbs
Soil profile: a podzol
-like plants and animals, soil can be classified into orders, class, etc
-most soil in sudbury is referred to as podzol, which means it is hydromorphic soil
-this means there is a downward movement of water and ions, and therefore
leaching of constituents
-to classify, you must look at the soil profile, therefore the horizons
-layers
-O layer
-F1: litter layer
-F2: more decomposed
-A layer
-A1: darker due to hummus leaching down
-A2: elluvial, iron leached down and out
-B layer
-B1: illuvial: iron has washed in from above
-B2
-C layer
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Bigger then 2 mm particles is gravel and stones. Smaller then 2 mm particles is ne earth. Particles from aggregates (meaning they don"t exist alone) are peds or crumbs properties of soil. Can be mechanically analyzed through sedimentation/decantation (sand), pipette method ( ne sand, clay, silt), or hydrometer (silt and clay) The way the particles are held together into peds. And they can all be strong, intermediate, or weak. Look at raw soil, impregnate it with resin, make thin sections, see micro-crumbs. Like plants and animals, soil can be classi ed into orders, class, etc. Most soil in sudbury is referred to as podzol, which means it is hydromorphic soil. This means there is a downward movement of water and ions, and therefore leaching of constituents. To classify, you must look at the soil pro le, therefore the horizons. A1: darker due to hummus leaching down. A2: elluvial, iron leached down and out.
