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Ch 5 ppt
 

Ch 5 ppt

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    Ch 5 ppt Ch 5 ppt Presentation Transcript

    • Chapter 4 Biogeochemical Cycles Lake Washington Case Study
    •  
    • 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
    • Geologic Cycles
      • Tectonic Cycle
    •  
      • Top layer ( lithosphere ) is constantly created and destroyed. Large segments (tectonic plates) move past one another.
      • Transform fault =
      • Convergent =
      • Divergent =
      • Transform fault = sliding
      • Convergent = colliding
      • Divergent = spreading
    •  
    • Hydrologic Cycle: Ch 19 in detail
    • Major Global Cycles
      • Carbon
      • Nitrogen
      • Phosphorus
      • 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?
    • The Carbon Cycle
      • Gaseous (CO 2 , CH 4 ). Most important organic compound.
    • 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?
      • Nitrogen Cycle
      • N 2 = most of the atm (about 80%)
      110 m. tons annually 10 m. tons annually
      • 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 )
      • Into living things:
          • 3. Plants absorb nitrates and ammonia by assimilation
      • Back into soil again:
      • Back into the atm again
    • 80% N 2 in atm Ammonification Nitrification step1 Nitrification step2 Assimilation Nitrogen fixation Denitrification
    • Symbiosis - Crop Rotation
    • Phosphorus
      • Phosphorus has no atm stage.
      • How does this affect its’ use by l.t.s?
    • 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)
    •