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A Celebration of Humus :tada: - Coggle Diagram
A Celebration of Humus
:tada:
Mor
Horizons
Matted F horizion
abrupt boundary between mineral soil and organic layer
Location Found
Coniferous Forest
Qualities
Fungai mycorrhizae present
slow decomposition rate
Low Ph
High Carbon-Nitrogen ratio
Classification: Mor
"Because there's Mor of it!"
Moder
Horizons
Contains an F horizon that is loosely structured
Clear and sudden boundary between organic and mineral layer
both are characterized by F horizons
Location Found
Deciduous forests
Qualities
Neutral pH
Good Carbon-Nitrogen ratio
Microbial activity
Soil fauna present
Moderate rate of decomposition
Classification: Moder
"It's been Modered over and partially broken down"
Mull
:
Horizons
F and H horizons are very thin or entirely absent
The Ah horizon is present
Location Found
Grasslands
Qualities
Neutral pH
Good Carbon-Nitrogen ratio
Microbial activity
Soil fauna present
Rapid rate of decomposition
Classification: Mull
"It's been totally Mulled over"
Important functions of Humus
source of nutrients
source for N, S, P
high cation exchange capacity
organic acid production
acts as a natural mulch
protects soil surface from water impact (ex. rain drops)
insulation
affects soil aeration
promotes regeneration of certain species
pic of the organic matter acting as mulch
