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Transcript

  • 1. Chapter 4 Biogeochemical Cycles Lake Washington Case Study
  • 2.  
  • 3. What is a biogeochemical cycle?
    • Path a chem takes through air, water, soil, orgs. and back to air or soil
    • Time taken to cycle varies.
    • Gaseous elements faster
    • Non-gaseous slower
  • 4. Geologic Cycles
    • Tectonic Cycle
  • 5.  
  • 6.
    • Top layer ( lithosphere ) is constantly created and destroyed. Large segments (tectonic plates) move past one another.
    • Transform fault =
    • Convergent =
    • Divergent =
  • 7.
    • Transform fault = sliding
  • 8.
    • Convergent = colliding
  • 9.
    • Divergent = spreading
  • 10.  
  • 11. Hydrologic Cycle: Ch 19 in detail
  • 12. Major Global Cycles
    • Carbon
    • Nitrogen
    • Phosphorus
  • 13.
    • Where do we find C?
    • Does it have an atm stage?
    • How might carbon cycle be thrown out of balance?
    • What happens if out of balance?
  • 14. The Carbon Cycle
    • Gaseous (CO 2 , CH 4 ). Most important organic compound.
  • 15. Nitrogen Cycle
    • Where do we find N?
    • Does it have an atm stage?
    • How might the nitrogen cycle be thrown out of balance?
    • What happens if out of balance?
  • 16.
    • Nitrogen Cycle
    • N 2 = most of the atm (about 80%)
    110 m. tons annually 10 m. tons annually
  • 17.
    • Nitrogen cycle key steps!!:
    • First in atmosphere as N 2
    • Then in the soil:
        • 1. Nitrogen fixation: fixes N 2 to a form plants can use
        • 2. Other bacteria convert ammonia into nitrates ( NO 3 )
  • 18.
    • Into living things:
        • 3. Plants absorb nitrates and ammonia by assimilation
  • 19.
    • Back into soil again:
    • Back into the atm again
  • 20. 80% N 2 in atm Ammonification Nitrification step1 Nitrification step2 Assimilation Nitrogen fixation Denitrification
  • 21. Symbiosis - Crop Rotation
  • 22. Phosphorus
    • Phosphorus has no atm stage.
    • How does this affect its’ use by l.t.s?
  • 23. Phosphorus Cycle
    • No gaseous phase
    • Stored in rocks and organic material in soil
    • Thanks to microbial action, changed to phosphates (PO 4 3- or HPO 4 2- )which plants can access. (slowly)
  • 24.