Resource cycles in ecosystems

1
Resource cycles in ecosystems
2
Cycles

• Essential nutrients for living things flow
  through the ecosystem.
• The reservoirs can be in the air, land, or
  oceans.
• Important resources cycle through the living and
  nonliving parts of ecosystems

3
Biogeochemical Cycle

• Energy flows through an ecosystem.
• Water and minerals recycle in the ecosystem.
• Water Nitrogen
• Minerals Calcium
• Carbon Phosphorus

Think Why the Earth needs a constant influx of
energy from the sun, but does not need water from
an outside source.
4
Water cycle

• Availability of water determines productivity
• Water moves from the sky to land as precipitation
  then back via evaporation
• Transpiration 90 of water that evaporates in
  ecosystem passes through plants.

5
Carbon cycle
Think What 2 things do humans burn that put CO2
into the atmosphere.

• Carbon cycles from atmospheric CO2 into living
  things through photosynthesis
• CO2 returns to atmosphere from respiration
  burning
• Oceans, soils plants act as a carbon reservoirs

6
Nitrogen cycle

• All living organisms need nitrogen (N2)
• 78 of the atmosphere is composed of N2. which is
  only usable to a few organisms.
• Nitrogen fixing bacteria take gaseous N2 turn
  it into a liquid or solid form that plants can
  use.
• Breakdown of organic material results in ammonia.
• Nitrogen is returned to the atmosphere when
  animals and their waste decomposes.

7
Human impact of natural cycles
Human activity such as burning fossil fuels
deforestation has greatly impacted natural
nutrient cycles. Causing air, water, and soil
pollution.
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Summary Review

• Diagram the following cycles water carbon, and
  nitrogen then answer the question How have
  humans impacted these cycles?