Ren R 441 Brunisols

  1. diagnostic horizon
    • B horizon
    • often a Bm, may be Btj or Bfj
    • >/= 5cm thick
    • high chroma (greater than 3.5)
  2. ______ soils
    • juvenile soils
    • one stage beyond regosols
  3. distribution in canada
    • usually forest, alpine, tundra vegetation
    • mesic to subarctic temperature
    • perhumid to semiarid moisture
  4. associated with which other soil types?
    luvisols and podzols
  5. great groups
    • melanic
    • eutric
    • sombric
    • dystric
  6. melanic brunisols
    • mull Ah > 10cm
    • pH of B horizon > 5.5
    • eastern hardwood forests
    • precursor to gray brown luvisol
  7. eutric brunisols
    • little or no mull Ah
    • well developed LFH
    • calcareous pgm (pH of B horizon > 5.5)
    • boreal forest
    • associated with gray luvisols
  8. sombric brunisols
    • mull or moder Ah from arthropod mixing of litter
    • non-calcareous pgm (pH of B horizon < 5.5)
    • coastal areas of BC
    • evolves to podzolic soils
  9. dystric brunisols
    • no substantial Ah
    • has LFH
    • non-calcareous pgm (pH < 5.5)
    • eastern canada
    • forest, alpine, heath vegetation
    • precursor to podzolic soils
  10. subgroups of dystric brunisols
    • orthic dystric brunisol
    • eluviated dystric brunisol (Ae)
  11. orthic subgroups
    • based on modal concept
    • Bm horizon
  12. eluviated subgroups
    minor eluviation of clay minerals
  13. duric subgroups
    • chemical weathering of Fe minerals
    • formation of secondary Fe oxides 
    • minor eluviation and illuviation
  14. major soil forming factors: climate
    • cooler temps
    • semi-arid
  15. major soil forming factors: organism
    forest (mixed wood)
  16. major soil forming factors: relief
    not an important factor
  17. major soil forming factors: pgm
    • calcareous glacial till
    • sand acidic Canadian shield
    • eolian veneers
    • volcanic tephra
  18. major soil forming factors: time
    depends if the soil is at equilibrium
  19. landscape relationships
    • occur where pgm is fairly recently deposited
    • occur in areas of disturbance
    • occur in harsh climatic regions (where pedogenic processes are slow)
  20. melanic and eutric brunisols are ____ agricultural soils
    good
  21. dystric and sombric brunisols are ____
    less fertile, prone to soil acidity issues
  22. issues with reclamation of brunisols
    • compaction
    • low OM, low fertility
  23. solutions to brunisol reclamation issues
    • mulch
    • better site prep (timing, decompaction, etc)
    • coarse woody debris (CWD)
Author
hcunning
ID
324666
Card Set
Ren R 441 Brunisols
Description
brunisols lecture
Updated