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Phosphorus Cycle

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P is a common element found all around us. ... algae, thus depleting oxygen levels and suffocating fish and other aquatic fauna. ... – PowerPoint PPT presentation

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Title: Phosphorus Cycle


1
Phosphorus Cycle
Environmental Plant Phys.
Amanda Kevin Sarah
2
Phosphorus
  • P is a common element found all around us.
  • Present in lakes, streams, oceans, soil, rocks,
    animals, and plants.

3
Phosphorus in Plants
  • P is one of 17 essential nutrients for plant
    growth.
  • Nitrogen and potassium are the only other
    essential plant nutrients taken up in greater
    amounts.

4
Importance of Phosphorus
  • P is integral in plant metabolism and ATP
    production, as well as forming the backbone of
    DNA and RNA.
  • P plays an essential role in the Calvin Cylce and
    the conversion of sunlight to useable forms of
    energy (glucose).

5
Calvin Cycle
6
The P Cycle
  • Describes the process by which P travels through
    the lithosphere, hydrosphere, and biosphere.
  • Unique in that P is rarely found in the
    atmosphere.

7
Origin of Phosphorus
  • P is present in rocks as well as in salts in
    ocean sediments.
  • Over time weathering releases P from rocks where
    it finds its way into the soil and water.

8
P Cycle and Life
  • From the soil and water P is taken up by plants
    and algae.
  • P then travels up the food chain going from
    consumer to consumer.
  • P finds its ways back into the soil and water
    through excretion by consumers and the finals
    decomposition of organisms.

9
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10
The P Cycle and Humans
  • Phosphate is mined and used to make fertilizer,
    which may be applied to farmers soil.
  • Corn that is grown there may be used to feed
    cattle.
  • Part of phosphate from the roots of the corn
    plants absorbed end up in feedlot wastes, which
    is usually used as fertilizer and washed into
    rivers.
  • Beef from cattle may be consumed by people, where
    it ends up in human waste and flushed into sewer
    systems.
  • To make up for steady loss of phosphate from
    land, farmers add phosphate fertilizer to fields.

11
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12
Human Impact
  • When P finds its way into waterways in large
    amounts, as result of runoff from the use of
    fertilizers, it can greatly contribute to
    eutrophication.
  • The process of eutrophication causes excessive
    growth of water plants and algae, thus depleting
    oxygen levels and suffocating fish and other
    aquatic fauna.

13
SOURCES
www.ikzm-d.de/abbildungen/59_phosphoruscycle.gif
http//www.ipm.iastate.edu/ipm/icm/2000/8-7-2000/p
basics.html http//www.enviroliteracy.org/article
.php/480.html http//www.ppi-far.org/ppiweb/ppiba
se.nsf/webindex/article88446F25852568F20064198A1
48EEE97 http//arnica.csustan.edu/carosella/Biol4
050W03/figures/phosphorus_cycle.htm http//en.wik
ipedia.org/wiki/Phosphorus_cycle
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