Element Cycles EQ: How can I explain the difference between nitrogen fixation and denitrification.
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Transcript of Element Cycles EQ: How can I explain the difference between nitrogen fixation and denitrification.
Element Cycles
EQ: How can I explain the difference between nitrogen fixation and denitrification.
BIOGEOCHEMICAL CYCLES
Matter within ecosystems is
recycled.
decomposersbacteria and fungi
soilminerals and
humus
producersgreen algae
water and salts
consumersanimals
decay
dieeaten
die
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
BIOGEOCHEMICAL CYCLES• Water, carbon, oxygen,
nitrogen & other elements cycle from the abiotic to biotic & then back to the environment.
bioticabiotic
BIOGEOCHEMICAL CYCLES
• Three example cycles:
• Water
• Carbon (carbon-oxygen)
• NitrogenH2O C
N O
NITROGEN CYCLE• 79% of the atmosphere is
nitrogen gas but it is in a form most living things cannot use.
N2free
nitrogen
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?
NITROGEN CYCLE
• Nitrogen-fixing bacteria convert NITROGEN into NITRATES.
• Plants absorb NITRATES.
• Animals eat plants.
N2
in airnitrogen-fixing
bacteria
NITRATES
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
NITROGEN CYCLE• Why do we need nitrogen?
• Nitrogen is an essential element for all proteins (amino acids) and nucleic acids.
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
NITROGEN CYCLE
nitrogen-fixing bacteria
nitratesorganicmatter
denitrifyingbacteria
gaseous losses (N2, NOx) lightning
fixes N2 intonitrates
CLOCK BUDDY TIME
3:00 CLOCK BUDDY
Draw and explain the nitrogen cycle, highlighting nitrogen fixation and denitrification.
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
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
CARBON CYCLE
• Carbon is returned to the atmosphere environment by: (leave space to write the definition)
• cellular respiration
• erosion
• combustion
• decomposition
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