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The Phosphorus Cycle

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The Phosphorus Cycle You can learn here in my PowerPoint the Phosphorus Cycle Phosphorus Cycle is the biogeochemical cycle that describes the movement of phosphorus ... – PowerPoint PPT presentation

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Title: The Phosphorus Cycle


1

The Phosphorus Cycle
  • You can learn here in my PowerPoint the
    Phosphorus Cycle

2
Phosphorus Cycle
  • is the biogeochemical cycle that describes the
    movement of phosphorus through the lithosphere,
    hydrosphere, and biosphere. Unlike many other
    biogeochemical cycles, the atmosphere does not
    play a significant role in the movements of
    phosphorus, because phosphorus and
    phosphorus-based compounds are usually solids at
    the typical ranges of temperature and pressure
    found on Earth.
  • enters the environment from rocks or deposits
    laid down on the earth many years ago. The
    phosphate rock is commercially available form is
    called apatite. Other deposits may be from
    fossilized bone or bird droppings called guano.
    Weathering and erosion of rocks gradually
    releases phosphorus as phosphate ions which are
    soluble in water. Land plants need phosphate as a
    fertilizer or nutrient.

3
The aquatic phosphorus cyclePhosphorus is an
essential nutrient for plants and animals in the
form of ions PO43- and HPO42-. It is a part of
DNA-molecules, of molecules that store energy
(ATP and ADP) and of fats of cell membranes.
Phosphorus is also a building block of certain
parts of the human and animal body, such as the
bones and teeth.
4
Phosphorus normally occurs in nature as part of a
phosphate ion, consisting of a phosphorus atom
and some number of oxygen atoms, the most
abundant form (called orthophosphate) having four
oxygens PO4-. Most phosphates are found as salts
in ocean sediments or in rocks. Over time,
geologic processes can bring ocean sediments to
land, and weathering will carry terrestrial .
Plants absorb phosphates from the soil. The
plants may then be consumed by herbivores who in
turn may be consumed by carnivores. After death,
the animal or plant decays, and the phosphates
are returned to the soil. Runoff may carry them
back to the ocean or they may be reincorporated
into rock.
5
  • The primary biological importance of phosphates
    is as a component of nucleotides, which serve as
    energy storage within cells (ATP) or when linked
    together, form the nucleic acids DNA and RNA.
    Phosphorus is also found in bones, whose strength
    is derived from calcium phosphate, and in
    phospholipids (found in all biological
    membranes).
  • Phosphates move quickly through plants and
    animals however, the processes that move them
    through the soil or ocean are very slow, making
    the phosphorus cycle overall one of the slowest
    biogeochemical cycles.

6
  • Unlike other cycles of matter compounds,
    phosphorus cannot be found in air in the as a
    gas. This is because at normal temperature and
    circumstances, it is a liquid. It usually cycles
    through water, soil and sediments. In the
    atmosphere phosphorus is mainly small dust
    particles.
  • Phosphorous is one of the longest cycles, and
    takes a long time to move from sediments to
    living organisms and back to sediments.

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Pictures of Phosphorus Cycle
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Prepared byJUNAL MAY E. TUOZO
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