Biogeochemical Cycles

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Biogeochemical Cycles

  1. 1. Biogeochemical Cycles
  2. 2. Nitrogen Cycle <ul><li>Nitrogen is needed by all organisms for cell-building. </li></ul><ul><li>Atmospheric nitrogen (N 2 ) is inert and needs to be changed into more reactive forms. </li></ul><ul><li>Reactive forms of nitrogen: ammonium (NH 4 + ), nitrates (NO 3 - ) </li></ul>
  3. 3. Nitrogen Cycle <ul><li>Processes: </li></ul><ul><ul><ul><li>Nitrogen fixation </li></ul></ul></ul><ul><ul><ul><li>Nitrogen uptake or assimilation </li></ul></ul></ul><ul><ul><ul><li>Decomposition </li></ul></ul></ul><ul><ul><ul><li>Nitrification </li></ul></ul></ul><ul><ul><ul><li>Denitrification </li></ul></ul></ul>
  4. 5. Nitrogen Cycle <ul><li>Human Activities </li></ul><ul><ul><li>Using synthetic nitrogen fertilizers </li></ul></ul><ul><ul><ul><li>Increased agricultural production </li></ul></ul></ul><ul><ul><ul><li>Contamination of groundwater </li></ul></ul></ul><ul><ul><ul><li>Algal blooms </li></ul></ul></ul><ul><ul><ul><li>Fish kills </li></ul></ul></ul><ul><ul><li>Burning fossil fuels </li></ul></ul><ul><ul><ul><li>Air pollution </li></ul></ul></ul><ul><ul><ul><li>Acid rain </li></ul></ul></ul><ul><ul><ul><li>Global warming </li></ul></ul></ul>
  5. 6. Let’s Review
  6. 7. Let’s Review
  7. 8. Carbon dioxide - Oxygen Cycle <ul><li>CO 2 is needed by plants in photosynthesis (making food) and is a greenhouse gas. </li></ul><ul><li>O 2 is needed by organisms in respiration (getting energy from food). </li></ul><ul><li>Processes: </li></ul><ul><ul><ul><li>Photosynthesis </li></ul></ul></ul><ul><ul><ul><li>Respiration </li></ul></ul></ul><ul><ul><ul><li>Combustion </li></ul></ul></ul>
  8. 11. Carbon dioxide-Oxygen Cycle <ul><li>Photosynthesis </li></ul><ul><ul><li>the process by which plants make food (glucose) </li></ul></ul><ul><ul><li>CO 2 + H 2 O sunlight C 6 H 12 O 6 + O 2 </li></ul></ul><ul><ul><li>releases O 2 into the air </li></ul></ul>
  9. 12. Carbon dioxide-Oxygen Cycle <ul><li>Respiration </li></ul><ul><ul><li>the process by which living things get energy by “burning” food </li></ul></ul><ul><ul><li>C 6 H 12 O 6 + O 2 CO 2 + H 2 O + energy </li></ul></ul><ul><ul><li>releases CO 2 into the air </li></ul></ul>
  10. 13. Carbon dioxide-Oxygen Cycle <ul><li>Combustion </li></ul><ul><ul><li>the process by which fuels are burned to release energy (heat) </li></ul></ul><ul><ul><li>fuel + O 2 CO 2 + heat </li></ul></ul><ul><ul><li>releases CO 2 into the air </li></ul></ul>
  11. 14. Carbon dioxide - Oxygen Cycle <ul><li>Human Activities </li></ul><ul><ul><li>Deforestation </li></ul></ul><ul><ul><ul><li>Increased CO 2  global warming </li></ul></ul></ul><ul><ul><ul><li>Decreased O 2 </li></ul></ul></ul><ul><ul><li>Burning fossil fuels </li></ul></ul><ul><ul><ul><li>Increased CO 2  global warming </li></ul></ul></ul><ul><ul><ul><li>Air pollution </li></ul></ul></ul>
  12. 15. The End

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