Biogeochemical Cycles - PowerPoint PPT Presentation

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Biogeochemical Cycles

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... Burning of fossil fuels Oil Coal Natural gas Burning of wood Forest fires Human activities Volcanic eruptions Carbon and ... Keila Mena Last modified by: – PowerPoint PPT presentation

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Title: Biogeochemical Cycles


1
Biogeochemical Cycles
2
  • Need to consider interactions between abiotic
    (non living) and biotic (living) factors.
  • Also consider energy flow and chemical cycling.

3
  • Carbon, nitrogen and oxygen can be recycled
    between living and non-living things in an
    ecosystem and the biosphere.

4
  • Even though energy flow and chemical cycling are
    different in nature, they are related to feeding
    patterns within ecosystems

5
Chemical Cycling
  • Producers incorporate chemicals from non-living
    environment into organic compounds.
  • Consumers feed on producers, incorporating some
    chemicals into their bodies and release some as
    waste.
  • As organisms die, decomposers break them down to
    supply chemicals in the inorganic form for soil,
    water and air.
  • Three types of cycling
  • Carbon and Oxygen Cycle
  • Nitrogen Cycle
  • Water Cycle

6
Carbon and Oxygen Cycle
  • In the atmosphere carbon is found in its
    inorganic form CO2.
  • Producers use the CO2 to form organic compounds
    during photosynthesis.
  • During cellular respiration, both producers and
    consumers break down organic compounds and
    release CO2 as a waste product.
  • Non-living processes contribute to CO2 production

7
  • Burning of fossil fuels
  • Oil
  • Coal
  • Natural gas
  • Burning of wood
  • Forest fires
  • Human activities
  • Volcanic eruptions

8
Carbon and Oxygen Cycle
9
Nitrogen Cycle
  • Nitrogen
  • Found in all living organisms
  • An element of Amino Acids
  • Produce proteins
  • Makes up 80 of the Earths atmosphere
  • Producers can use it in the form of ammonium or
    nitrate
  • Nitrogen fixation
  • Nitrogen gas to ammonia
  • Nitrification
  • Ammonium to nitrates

10
Nitrogen Cycle
11
Water Cycle
  • Solar energy evaporates water from land and
    water surfaces adding gaseous water vapor into
    the atmosphere.
  • Water vapor cools and condenses falling to the
    ground as precipitation.
  • Rain
  • Snow
  • Hail
  • Sleet
  • Plants get water from soil, consumers by eating
    and drinking.

12
  • Some water can be lost by plants through the
    process called transpiration, which is then
    evaporated into the atmosphere.
  • Water not retained by plants or soil will run off
    into rivers and streams, or restore ground waters.

13
Water Cycle
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