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Brown Earth - Coggle Diagram
Brown Earth
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EXPLAIN
B
- High precipitation in winter leads to leaching.✔
- which is the downward movement of the aluminium and iron oxides. ✔
- This leads to formation of an iron pan between the A/B horizons.✔
- This iron pan may impede drainage causing water logging.✔
- In summer evaporation is greater than precipitation so capillary action takes place.✔
- This is the upward movement of minerals as water is evaporated from the soil.✔
- Indistinct horizons due to soil biota mixing and aerating soil.✔
AO
- Deciduous trees and leaves produce acidic (mull) humus.✔
- Milder temperatures lead to quick decomposition.✔
C
- Roots can absorb minerals and take back to A horizon lightening colour.✔
- Hard rocks such as schist are more resistant so weather more slowly than softer rocks such as shale.✔
- South-facing slopes in northern hemisphere with a greater amount of sunshine and higher temperatures increase the rate decomposition resulting in humus layer.✔
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