KEY CONCEPT Matter cycles in and out of an ecosystem. - PowerPoint PPT Presentation

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KEY CONCEPT Matter cycles in and out of an ecosystem.

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KEY CONCEPT Matter cycles in and out of an ecosystem. Elements essential for life also cycle through ecosystems. A biogeochemical cycle is the movement of a ... – PowerPoint PPT presentation

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Title: KEY CONCEPT Matter cycles in and out of an ecosystem.


1
KEY CONCEPT Matter cycles in and out of an
ecosystem.
2
Elements essential for life also cycle through
ecosystems.
  • A biogeochemical cycle is the movement of a
    particular chemical through the biological and
    geological parts of an ecosystem.

3
  • The hydrologic, or water cycle is the circular
    pathway of water on Earth from the atmosphere, to
    the surface, below ground, and back
  • Evaporation
  • Cloud formation
  • Precipitation
  • Transpiration (loss of H2O from plants)
  • Condensation
  • Runoff

4
Hydrologic Cycle
  • Precipitation rain or snow falls to ground
  • Water seeps into ground, ponds, streams, swamps,
    wetlands, lakes, etc.
  • Empty into oceans
  • Evaporation water reenters atmosphere
  • Transpiration water vapor released by plants
  • Condensation water vapor in atmosphere creates
    clouds

5
  • Oxygen cycles indirectly through an ecosystem by
    the cycling of other nutrients.

6
Oxygen Cycle
  • Plants release oxygen as waste during
    photosynthesis
  • Animals breathe in oxygen
  • Animals release carbon dioxide during cellular
    respiration
  • Plants take in carbon dioxide

7
  • Carbon is the building block of life.
  • The carbon cycle moves carbon from the
    atmosphere, through the food web, and returns to
    the atmosphere.

Carbon Dioxide in air
Burning of Fossil fuels
Photo- synthesis
Carbon Dissolved In water
respiration
decomposition
8
Carbon Cycle
  • Plants use energy from the sun to convert carbon
    dioxide into sugar that become part of the
    plants structure
  • Moves to animals as they eat plants and as one
    organism eats another
  • Carbon is returned to the atmosphere by
  • 1. respiration
  • 2. decomposition of dead organisms
  • 3. Burning of fossil fuels and wood
  • 4. Emissions from factories/cars
  • 5. Methane emission from wetlands/landfills/livest
    ock

9
  • The nitrogen cycle mostly takes place underground.

10
Nitrogen Cycle
  • Bacteria turns gaseous nitrogen into ammonia
  • Ammonia released into the soil is transformed
    into ammonium by materials in the soil
  • Nitrifying bacteria change the ammonium into
    nitrate
  • Nitrate is taken up by plants
  • Plants convert the nitrate into amino acids and
    proteins
  • Nitrogen moves through the food web as animals
    eat plants and/or other animals
  • Nitrogen returned to soil as decomposers break
    down animal excretions or dead animals
  • Denitrifying bacteria use nitrate as an oxygen
    source, releasing nitrogen gas into the
    atmosphere as a waste product

11
  • The phosphorus cycle takes place at and below
    ground level.
  • Phosphate is released by the weathering of rocks.
  • Phosphorus moves through the food web and returns
    to the soil during decomposition.
  • Phosphorus leaches into groundwater from
    the soil and is locked in sediments.
  • Both mining and agriculture add phosphorus
    into the environment.
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