Biogeochemical cycles
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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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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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