week 6, day 2 - Week 6 day 2 Geochemical cycle A...

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Week 6, day 2 Geochemical cycle A geochemical cycle in which biological processes are involved Lithosphere + atmosphere + hydrosphere + biosphere Francis Bretherton Developed the Bretherton diagram Attempted to combine all of earth’s systems/cycles together o Previous attempts did not include the biosphere Terms Nutrients o An element or compound that organisms consume and require for survival o Nutrients move through all spheres Reservoir o A container or place for elements or compounds Flux o Transfer into or out of a reservoir per unit of time Turnover time o How long it takes for items to stay in a reservoir Three important biogeochemical cycles that influence things on earth 1. Nitrogen 2. Carbon 3. Phosphorus Nitrogen cycle Makes up 78% of the atmospheric gases 6 th most abundant element on earth o Essential ingredient in proteins and DNA Is chemically inert o Cannot cycle out of atmosphere and into organisms without assistance o Three mechanisms: 1. Lightning (natural) 2. Bacteria (natural) 3. Human intervention Figure 5.18 is the nitrogen cycle Nitrogen fixation Needed for atmospheric nitrogen to become biologically available 1.Lightning strikes 2. Nitrogen-fixing bacteria o Mutualistic relationship with legumes
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Figure 5.19 in the book Human intervention
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  • Fall '11
  • JeffreyDorale
  • Bretherton diagram, Francis Bretherton

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