element cycles eq: how can i explain the difference between nitrogen fixation and denitrification
TRANSCRIPT
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Element Cycles
EQ: How can I explain the difference between nitrogen fixation and denitrification.
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BIOGEOCHEMICAL CYCLES
Matter within ecosystems is
recycled.
decomposersbacteria and fungi
soilminerals and
humus
producersgreen algae
water and salts
consumersanimals
decay
dieeaten
die
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All Cycles Are Related
Carbon, Nitrogen, Sulfur, Phosphorusin
Plants and Organisms
N2
Fossil Fuel Combustion
H2O
CO2
SO2, NO2
Phyto- plankton
Zoo- plankton
Ocean Sediments
Nutrient Recycling
Nitrogen Fixing Bacteria
Nitrates, Sulfates,
Phosphates
Phosphate
Nitrite, Dead Organic Mattrer &
Decomposers
H2O
Urea Runoff
Respiration Decomposition
Transpiration
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BIOGEOCHEMICAL CYCLES• Water, carbon, oxygen,
nitrogen & other elements cycle from the abiotic to biotic & then back to the environment.
bioticabiotic
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BIOGEOCHEMICAL CYCLES
• Three example cycles:
• Water
• Carbon (carbon-oxygen)
• NitrogenH2O C
N O
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NITROGEN CYCLE• 79% of the atmosphere is
nitrogen gas but it is in a form most living things cannot use.
N2free
nitrogen
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NITROGEN CYCLE
• If we can’t take in free nitrogen, how do we acquire it so we can use it in our bodies?
• Why do we need nitrogen in our bodies?
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NITROGEN CYCLE
• Nitrogen-fixing bacteria convert NITROGEN into NITRATES.
• Plants absorb NITRATES.
• Animals eat plants.
N2
in airnitrogen-fixing
bacteria
NITRATES
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NITROGEN CYCLE• How does the nitrogen return to
the atmosphere?• Denitrifying bacteria convert
the nitrates back into nitrogen.
N2
in airnitrogen-fixing
bacteria
NITRATES
denitrifyingbacteria
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NITROGEN CYCLE• Why do we need nitrogen?
• Nitrogen is an essential element for all proteins (amino acids) and nucleic acids.
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NITROGEN CYCLE
Can plants & animals use free nitrogen?
In what form must N2 be to be used by plants?
What organisms can fix the N2 into a usable form?
N2free
nitrogen
nitrates
nitrogen-fixingbacteria
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NITROGEN CYCLE
nitrogen-fixing bacteria
nitratesorganicmatter
denitrifyingbacteria
gaseous losses (N2, NOx) lightning
fixes N2 intonitrates
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CLOCK BUDDY TIME
3:00 CLOCK BUDDY
Draw and explain the nitrogen cycle, highlighting nitrogen fixation and denitrification.
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CARBON CYCLE• The exchange of gases during
photosynthesis and respiration is a major example of the living-nonliving cycle of carbon-oxygen.
respirationphotosynthesis
O2
CO2
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CARBON CYCLE
• How does carbon enter the living part of the cycle?
CO2 + H2O ----> C6H12O6 + O2
CO2CO2
CO2
CO2 CO2
CO2
CO2CO2
Using the process of PHOTOSYNTHESIS, plants use CO2 to make food
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CARBON CYCLE
• Carbon is returned to the atmosphere environment by: (leave space to write the definition)
• cellular respiration
• erosion
• combustion
• decomposition
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CARBON CYCLE
limestone
combustion
soil erosion
animal respiration
plant respiration
photosynthesisby plants
photosynthesisby algae
respirationby algae
and aquaticanimals
litter
fossil fuelscoal, gas, petroleum
CO2 in Atmosphere
decomposition oceans, lakes
RESPIRATION - CO2 is released back into the atmosphere when food (glucose) is broken down during respiration
PHOTOSYNTHESIS - Plants use carbon dioxide to make food
DECOMPOSITION - CO2 is released back into the atmosphere as organic matter is broken downCOMBUSTION - CO2 is released
back into the atmosphere when organic material is burned EROSION - CO2 is released back
into the atmosphere when erosion breaks down certain rock
decomposition