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5 Biogeochemical cycles

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by

Yareli Flores

on 10 May 2013

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Transcript of 5 Biogeochemical cycles

5 Biogeochemical Cycles Carbon cycle Nitrogen cycle Oxygen cycle Phosphorus cycle Hydrologic cycle - carbon is moved from the
atmosphere, through a
food web, and return-
ed to the atmosphere
- it enters a biotic envir-
onment through: photo-
synthesis
- carbon is given off
by the burning of fossil
fuels, decomposition,
and respiration
- it is also stored for long
periods in carbon sink areas - takes place mostly underground
- nitrogen needs to be broken
down to a polyatomic ion
called nitrate
- nitrogen fixation: process
where bacteria converts
nitrogen gas into ammonium
- nitrification: is the process
where bacteria changes
ammonium to nitrate
- nitrogen is returned to the atmosphere
by denitrifying bacteria and to the ground by decomposition - respiration takes place (oxygen inhaled, carbon dioxide exhaled)
- during photosynthesis oxygen is a waste
product biogeochemical: movement of a chemical
through biological and geological parts
of an ecosystem - takes place both above and under-
ground
- added by mining and agriculture
- leaching: the phosphate in
rocks is dissolved by water and
is carried to lakes, streams,etc.
- the dissolved phosphate is
used by plants and passed
through the food chain
- decomposition, excretion, death,
decay from animals returns phosphorus to environment
the soil and locked in sediments
known as the water cycle - water is moved
through the atmosphere,
to the surface, below
ground and back
- water is evaporated,
condensated, and
precipitated
- makes up over 70% of
Earth's surface oxygen is needed for cellular respiration in organisms - is leaked into the water from
Facts about Phosphorus - major environmental reservoir: rock
- phosphate is mined for fertilizers
which returns it to the soil
- erosion occurs when the phosphate in the soil/rocks is washed into water systems Facts about Nitrogen - nitrogen is approximately
79% of the air
- it is essential to plants and
animals
- ammonia and nitrate are both forms of usable nitrogen
- it is required for genetic materials such as DNA, RNA, and amino acids
- nitrogen fixation can create algae blue, peas, beans, alfalfa, clover, and lightning Facts about Carbon - carbon is the building block of
life
- it exists as: atmospheric carbon,
carbonate rocks, deposits of coal,
dead organic matter, and more
Full transcript