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Biogeochemical Cycles

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... Cycle Atmospheric Carbon Dioxide Slide 12 Nitrogen Cycle Nitrogen-Fixing Bacteria in Root Nodules Nitrogen Cycle Phosphorous Cycle Phosphorous Cycle ... – PowerPoint PPT presentation

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Title: Biogeochemical Cycles


1
Biogeochemical Cycles
2
3 Fundamental Laws of Nature
  • Conservation of Matter
  • 1st Law of Thermodynamics (Conservation of
    Energy)
  • 2nd Law of Thermodynamics (Entropy)

3
EarthMatter does not come and go
Earth is a Closed System to Matter
4
Biogeochemical CyclesReservoirs Pathways
Atmosphere
Biosphere
Lithosphere
Hydrosphere
5
Some Major Cycles of Matter
  • Water Cycle
  • Rock Cycle
  • Chemical Cycles
  • Carbon
  • Nitrogen
  • Phosphorous
  • Sulfur

6
Carbon Cycle
Atmosphere
Biosphere
Lithosphere
Hydrosphere
7
Carbon Cycle Reservoirs
Atmosphere
1x ( 7.3x1017 grams carbon)
Biosphere
3x
55x
35,000x
Lithosphere
Hydrosphere
8
Carbon Cycle
Atmosphere
Biosphere
Lithosphere
Hydrosphere
9
Carbon Cycle
Atmosphere
Biosphere
Lithosphere
Hydrosphere
10
Carbon Cycle
Human Impacts
Atmosphere
Biosphere
Net Effect Increase in Carbon in Atmosphere
Lithosphere
Hydrosphere
11
Atmospheric Carbon Dioxide
northern winter
northern summer
12
(No Transcript)
13
Nitrogen Cycle
Atmosphere
Denitification bacteria
Biosphere
  • Nitrogen fixation
  • bacteria
  • lightning

Absorption
Waste Decomposition
Erosion
Lithosphere
Hydrosphere
14
Nitrogen-Fixing Bacteria in Root Nodules
15
Nitrogen Cycle
Human Impacts
Atmosphere
Biosphere
Net Effect Increase in Nitrogen in water soil
  • Nitrogen fixation
  • industrial (fertilizer)
  • combustion

Increased Erosion
Lithosphere
Hydrosphere
16
Phosphorous Cycle
Never enters the atmosphere
Atmosphere
Biosphere
Absorption
Waste Decomposition
Weathering Erosion
Lithosphere
Hydrosphere
Absorption
Sedimentation
17
Phosphorous Cycle
Human Impacts
Biosphere
Net Effect Increase in phosphorous in water
algal blooms Depletion in soils
Mining, use (fertilizer, detergent, etc.)
increased runoff
Lithosphere
Hydrosphere
More Phos. for organisms
18
Eutrophication
19
ImpactRed Tide
20
Sulfur Cycle
Bacteria Absorption
Atmosphere
Bacteria Release
Biosphere
Volcanoes Weathering
Absorption
Precipitation
Waste Decomposition
Weathering
Evaporation
Sedimentation
Lithosphere
Hydrosphere
Absorption
Deep Sea Vents
21
Sulfur Cycle
Human Impacts
Atmosphere
Biosphere
Net Effect Increase in atmosphere (health
effects) and acid rain
Precipitation Acid Rain
Burning Fossil Fuels
Lithosphere
Hydrosphere
22
What is the ultimate interface of all 4
reservoirs for these cycles?
Soil
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