Soil Processes Flashcards
1
Q
Humification
A
The breakdown of plant remains which leads to the formation of different types of humus
Most important process
2
Q
Leaching
A
Where rainfall exceeds evaporation
Free downwards movement of water through the soil pore system
Soluble minerals are leached from soil profile
Leaching is most active in sandy soils with high porosity
Least in clays which have restricted pore spaces
3
Q
Capillary Action
A
Where evaporation exceeds precipitation moisture moves upwards
Reverse of leaching
Rarely occurs in UK
4
Q
Eluviation
A
When minerals and humus are washed out of the A horizon
5
Q
Illuviation
A
When materials washed into B horizon
6
Q
Decomposition
A
The breakdown of plant derived material into its simpler organic constituent
Caused by Enzymes, Earthworms, mites and other organisms
