agrn 1
Terms
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- rock:lithosphere::soil: ________
- pedoshpere
- Soil Horizons A, E, and B are known as...
- Solum
- A verticle section of the soil through all its horizons
- Soil Profile
- A layer of soil that differs in properties and characteristics from adjacent layers, approx. parallel to the surface
- Soil Horizon
- Loose earth laterial above solid rock
- Regolith
- Surface Soil
- Topsoil (usually O and A horizons). A horizon is also called the plow layer.
- Soil layers that underlie the topsoil
- Subsoil
- A 3-D body of soil with lateral dimension large enough to permit the study of horizon shapes and relations.
- Pedon
- Chemically weathered rock from which soil forms.
- Parent Material
- Solid rock and horizon designation.
- Bedrock; R
- Bedrock that has been weathered in place to the point that it is porous.
- Saprolite
-
Master Horizons
-Organic horizon on the soil surface - O Horizon
-
Master Horizons
-Horizon high in organic matter, but composed of mineral soil - A Horizon
-
Master Horizons
-subsurface horizon light in color due to leaching - E Horizon
-
Master Horizons
-Subsurface horizon from soil forming processes - B Horizon
-
Master Horizons
-Least weathered and deepest of all the horizons - C Horizon
-
Master Horizons
- Bedrock - R Horizon
-
4 soil components?
(ideal percentage) -
Solid
1) Mineral (45%)
2) Organic Matter (5%)
Pore Space
3) Water (25%)
4) Air (25%) -
-minerals that have not been altered chemically since depositoin
-result from decomposition of primary minerals -
-primary mineral
-secondary mineral -
a transitory component of soil.
made up of decomposed plant and animal residues. - organic matter
- functions of organic matter (4)
-
1.Stabalizes soil structure
2.Increases the amount of water a soil can hold
3.Major source of plant nutrient
4.Main food/energy for soil orgs - Soil Air (5 things)
-
-high spatial variability
-high temporal variability
-High moisture content
-High CO2 content
-Loz O2 content