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Biogeochemical Cycles

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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Biogeochemical Cycles

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  1. Biogeochemical Cycles

  2. 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

  3. 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

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

  5. 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

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

  7. Nitrogen Cycle N2 • N = 78% atmosphere (most unusable) • Soil Bacteria • Nitrogen fixation: convert atmospheric nitrogen into ammonia • Nitrification: ammonia converted into nitrates Ammonia Nitrates

  8. Nitrogen Cycle • Plants • Absorb nitrates through their roots Nitrates

  9. Nitrogen Cycle • Animals • Ingest nitrates through the food chain (plants eaten) Nitrates

  10. Nitrogen Cycle • Decomposers • Return ammonia to soil by feeding on dead matter Ammonia Ammonia Ammonia

  11. Nitrogen Cycle • Lightning • Energy breaks atmospheric nitrogen into Nitrogen oxide • Nitrogen oxide falls in rain to soil

  12. Phosphorus (P) Cycle • No phosphorus in atmosphere • Rocks • Phosphorus released by weathering of rocks P

  13. Phosphorus (P) Cycle • Plants • Absorb P into their roots P

  14. Phosphorus (P) Cycle • Animals • Ingest P when plants eaten • P continues to move up food chain P

  15. Phosphorus (P) Cycle • Decomposers • Breakdown dead matter and release P into soil P

  16. 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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