biogeochemical cycles
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Biogeochemical Cycles - PowerPoint PPT Presentation


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Biogeochemical Cycles. Oxygen Cycle. Autotrophs: Release O 2 into atmosphere via photosynthesis All life: Absorbs O 2 to be used during cellular respiration Respiration: creates ATP energy for cells. O 2. O 2. Carbon Cycle. CO 2.

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Presentation Transcript
oxygen cycle
Oxygen Cycle
  • Autotrophs: Release O2 into atmosphere via photosynthesis
  • All life: Absorbs O2 to be used during cellular respiration
    • Respiration: creates ATP energy for cells

O2

O2

carbon cycle
Carbon Cycle

CO2

  • Carbon = (organic molecules) carbohydrates, proteins, lipids, nucleic acids
  • Plants & autotrophs:
    • Intake: Absorb CO2 from atmosphere
      • Create glucose & sugar via photosynthesis
    • Output: Release CO2 during respiration

CO2

carbon cycle1
Carbon Cycle
  • Consumers
    • Intake: Carbon moves up the food chain as 1 feeds on another
    • Output: Release CO2 during respiration

CO2

CO2

carbon cycle2
Carbon Cycle
  • Decomposers
    • Input: Feed on dead organic matter
    • Output: Release CO2 during respiration
    • Output: Organic molecules returned to soil during decomposition

C

C

C

carbon cycle3
Carbon Cycle
  • Human Industry
    • Output: Release CO2 into atmosphere when fossil fuels (coal, oil, natural gas) are burned

CO2

nitrogen cycle
Nitrogen Cycle

N2

  • N = 78% atmosphere (most unusable)
  • Soil Bacteria
    • Nitrogen fixation: convert atmospheric nitrogen into ammonia
    • Nitrification: ammonia converted into nitrates

Ammonia

Nitrates

nitrogen cycle1
Nitrogen Cycle
  • Plants
    • Absorb nitrates through their roots

Nitrates

nitrogen cycle2
Nitrogen Cycle
  • Animals
    • Ingest nitrates through the food chain (plants eaten)

Nitrates

nitrogen cycle3
Nitrogen Cycle
  • Decomposers
    • Return ammonia to soil by feeding on dead matter

Ammonia

Ammonia

Ammonia

nitrogen cycle4
Nitrogen Cycle
  • Lightning
    • Energy breaks atmospheric nitrogen into Nitrogen oxide
    • Nitrogen oxide falls in rain to soil
phosphorus p cycle
Phosphorus (P) Cycle
  • No phosphorus in atmosphere
  • Rocks
    • Phosphorus released by weathering of rocks

P

phosphorus p cycle1
Phosphorus (P) Cycle
  • Plants
    • Absorb P into their roots

P

phosphorus p cycle2
Phosphorus (P) Cycle
  • Animals
    • Ingest P when plants eaten
    • P continues to move up food chain

P

phosphorus p cycle3
Phosphorus (P) Cycle
  • Decomposers
    • Breakdown dead matter and release P into soil

P

phosphorus p cycle4
Phosphorus (P) Cycle
  • Human Contribution
    • Adding excess P from fertilizers…. P washes into lakes, etc…
    • Excess P causes extreme algae growth
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