CH' 474

1
CH. 47-4

• Cycles within Ecosystems

2
Biogeochemical Cycles

• Cycle- process that describes how materials can
  be conserved or re-used again.
• Ex. Recycling of cans, bottles, paper
• Bio- life
• Geo- earth
• Chemical- complex compounds made up of atoms

3
Biogeochemical Cycles

• Materials including water(H2O),
  nitrogen(N2),Oxygen (O2) and carbon dioxide
  (CO2), are recycled through ecosystems
• Some other chemicals ammonia (NH3), nitrate
  (NO3)
• Burning fossil fuels is upsetting to carbon cycle
  and warming the atmosphere- greenhouse effect

4
Biogeochemical Cycles

• Describes how nutrients are recyceld throught
  biological systems (in living organisms) and
  through the earth
• Ex. Water Cycle, Carbon and Oxygen Cycle, and
  Nitrogen Cycle

5
Nutrient Cycle

• Nutrients circulate through ecosystem.
• Liken and Bormann- nutrients dont leave
  ecosystem.
• Producers keep nutrients- if producers lost then
  nutrients would leave.

6
Nitrogen Cycle

• Organisms must have nitrogen to make proteins.
• Living things cant use nitrogen gas N2 because
  strong bond except bacteria
• Nitrogen fixing bacteria break N2 bond and make
  ammonia (NH3) or nitrate (NO3).

7
Nitrogen Cycle

• Nitrogen fixers live in plant roots. Ammonia is
  taken up by plants.
• Animals eat plants to get nitrogen. (NH3)
• Nitrogen returned to soil by animal waste or
• Decomposers return nitrogen back to soil when
  animal or plant dies.(NH3)

8
Nitrogen Cycle

• Nitrification- NH3 is converted to NO3
• The NO3 is converted to N2 by denitrification
  from bacteria
• Complete cycle

9
Water Cycle

• Involves phase changes (solid, liquid, and gas)
• Water is never lost. (kept/ Conserved within
  ecosystem)

10
Water Cycle

• Water most important abiotic component.
• Water is evaporated from ocean and brought to
  forest, where it condenses on plants.
• It will run off back to ocean if no plants to
  stop it.

11
Carbon Cycle

• Carbon dioxide in air, plants use during
  photosynthesis.
• Consumers eat plants and get carbon
• Carbon dioxide given off by animals and plants
  returns to air (Cellular Respiration)
• Plants contain carbon which can only be put back
  by burning.
• Write equation for Photosynthesis and Respiration

12
Greenhouse effect

• Fossil Fuels contain carbon from plants. When too
  much fossil fuel is burned then to much carbon
  dioxide is put in atm.
• CO2 traps heat and heats planet.

13
Oxygen Cycle

• Describe the oxygen cycle which is much like the
  carbon cycle.
• They are the same.

14
Concept Map

• Develop a concept map for each cycle
• Then show how each cycle effects or leads to the
  next cycle.
• Groups of 3