Transcript 1.2_nutrient_cycles 880KB May 22 2015 12:21:18 PM

NUTRIENT CYCLES
Nutrients are chemicals that organisms need to survive.
Example – All organisms need Nitrogen to make protein
NUTRIENTS must be RECYCLED when animals and plants die so that new
animals and plants can get nutrients too.
PHOTOSYNTHESIS AND RESPIRATION ARE PARTNERS!
Photosynthesis: Producers CONVERT solar energy to sugar.
Carbon Dioxide + Water + Sun’s Energy --> Oxygen + Sugar
PHOTOSYNTHESIS AND RESPIRATION ARE PARTNERS!
Photosynthesis: Producers CONVERT solar energy to sugar.
Carbon Dioxide + Water + Sun’s Energy --> Oxygen + Sugar
Oxygen + Sugar--> water+ carbon dioxide + chemical energy
RESPIRATION: Animals (and plants) use Sugar as a source of
energy for growth, movement, repair, and reproduction
PHOTOSYNTHESIS AND RESPIRATION ARE PARTNERS!
Carbon Dioxide + Water + Sun’s Energy --> Oxygen + Sugar
Oxygen + Sugar--> water+ carbon dioxide + chemical energy
RESPIRATION: Animals (and plants) use Oxygen and Sugar to
make energy! CO2 is a product of this reaction and RECYCLES
the CO2 in the air.
THE CARBON CYCLE:
How carbon is balanced in
ecosystems
Combustion
means
Burning of
Fossil Fuels
Decomposed organisms are “storage” for carbon in the soil
Carbon conundrum
• Sources of atmospheric CO2 are
increasing
• SINKS (ways to remove CO2) from the
atmosphere are DECREASING
• We therefore have an excess CO2 in our
atmosphere
• This creates a blanket around the earth
that traps solar energy (GREENHOUSE
EFFECT)
Greenhouse Effect
Widespread
Pollution
The OCEAN is an important part of
the carbon cycle too.
THE NITROGEN CYCLE
Dead animals and
plants release N
into soil
AMMONIA
(NH3) is a
WASTE
product of
animals
Bacteria convert (change)
Atmospheric Nitrogen and
Nitrites into Nitrates
Some Nitrates
leech or “leak”
out of the soil into
water
Bacteria convert (change)
Ammonia into Nitrates
Weathering or
‘wearing down’
of rocks
Runoff
into water
Phosphate in the
water
Weathering or
‘wearing down’
of rocks
Runoff
into water
Phosphate in the
water
SEDIMENTATION
(animals, plants and
rocks settle to the
ground) making new
rocks
THE NITROGEN CYCLE