anton cwik, ethan sox per. 4 biogeochemical cycles
TRANSCRIPT
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Anton Cwik, Ethan Sox
Per. 4
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BIOGEOCHEMICAL CYCLES
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‘Fundamentals’ of biogeochemical cycles
• All matter cycles...it is neither created nor destroyed...
• As the Earth is essentially a closed system with respect to matter, we can say that all matter on Earth cycles .
• Biogeochemical cycles: the movement (or cycling) of matter through a system
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by matter we mean: elements (carbon, nitrogen, oxygen) or molecules (water)
so the movement of matter (for example carbon) between these parts of the system is, practically speaking, a biogeochemical cycle
The Cycling Elements:
macronutrients : required in relatively large amounts
"big six": carbon , hydrogen , oxygen , nitrogen , phosphorous sulfur
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other macronutrients:
potassium , calcium , iron , magnesium
micronutrients : required in very small amounts, (but still necessary)
boron (green plants) copper (some enzymes) molybdenum (nitrogen-fixing bacteria)
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ATMOSPHERE
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LITHOSPHERE
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HYDROSPHERE
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6 of the most important cycles are the water, carbon, nitrogen, sulfur, phosphorus and oxygen.
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1. Which part of the atmosphere has the highest altitude?A. Troposphere B. Stratosphere C. Thermosphere D. Mesosphere
2. Which part includes all three of the other parts?Lithosphere B. Ecosphere C. Hydrosphere D. Atmosphere
3. Which one is not a major cycle?A. Hydrogen B. Nitrogen C. Oxygen D. Sulfur E. Water
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HYDROLOGIC CYCLE
Slide 34Slide 34Slide 34
Figure 4-28Page 76
Precipitation toland
Transpirationfrom plants
Runoff Surface runoff(rapid)
Evaporationfrom land Evaporation
from ocean Precipitation toocean
Ocean storage
Surfacerunoff(rapid)
Groundwater movement (slow)
Rain cloudsCondensation
Transpiration
Evaporation
PrecipitationPrecipitation
Infiltration andPercolation
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HYDROLOGIC CYCLE
CONNECTS ALL OF THE
CYCLES AND
SPHERES TOGETHER
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HUMAN IMPACTS TO WATER CYCLE
1. Water withdrawal from streams, lakes and groundwater. (salt water intrusion and groundwater depletion)
2. Clear vegetation from land for agriculture, mining, road and building construction. (nonpoint source runoff carrying pollutants and reduced recharge of groundwater)
3. Degrade water quality by adding nutrients(NO2, NO3, PO4) and destroying wetlands (natural filters).
4. Degrade water clarity by clearing vegetation and increasing soil erosion.
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Water Quality Degradation
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MARINE CARBON CYCLE
Slide 35Slide 35Slide 35
Diffusion between atmosphere and ocean
Carbon dioxidedissolved in ocean water
Marine food websProducers, consumers,
decomposers, detritivores
Marine sediments, includingformations with fossil fuels
Combustion of fossil fuels
incorporation into sediments
death, sedimentation
uplifting over geologic time
sedimentation
photosynthesis aerobic respiration
Figure 4-29aPage 78
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TERRESTRIAL CARBON CYCLE
Slide 36Slide 36Slide 36
photosynthesis aerobic respirationTerrestrial
rocks
Soil water(dissolved
carbon)
Land food websproducers, consumers,
decomposers, detritivores
Atmosphere(most carbon is in carbon dioxide)
Peat,fossil fuels
combustion of wood (for clearing land; or for fuel
sedimentation
volcanic action
death, burial, compaction over geologic timeleaching
runoff
weathering
Figure 4-29b Page 79
Combustion of fossil
fuels
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Explain
Natural Sources
of
Carbon
Sources of Carbon from Human Activity
•Death of plants and animals•Animal waste•Atmospheric CO2•Weathering•Methane gas from cows (and other ruminants)•Aerobic respiration from terrestrial and aquatic life
•Burning wood or forests•Cars, trucks, planes•Burning fossil fuels such as coal, oil and natural gas to produce heat and energy.
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Carbon in Oceans• Additional carbon is stored in the ocean.
• Many animals pull carbon from water to use in shells, etc.
• Animals die and carbon substances are deposited at the bottom of the ocean.
• Oceans contain earth’s largest store of carbon.
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Slide 38Slide 38Slide 38
Figure 4-30Page 79
Year
1850 1900 1950 2000 20300
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Highprojection
Lowprojection
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IMPORTANCE OF CARBON CYCLE
CARBON IS THE BACKBONE OF LIFE!
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1. What is no part of the water cycle?A. Precipitation B. Percolation C. Transpiration D. Surface Runoff E. Boiling
2. Which is not a man made way of adding carbon to the carbon cycle?A. Airplanes B. Natural Fires C. Cars D. Burning fossil fuels
3. What are the predictions for how much carbon will be added from fossil fuels?A. Low B. Medium-Low C. Medium D. High
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The Nitrogen Cycle
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Sources
• Lightning• Inorganic fertilizers• Nitrogen Fixation• Animal Residues• Crop residues• Organic fertilizers
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Forms of Nitrogen
• Urea CO(NH2)2
• Ammonia NH3 (gaseous)• Ammonium NH4
• Nitrate NO3
• Nitrite NO2
• Atmospheric Dinitrogen N2
• Organic N
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Global Nitrogen Reservoirs
Nitrogen Reservoir
Metric tons nitrogen
Actively cycled
Atmosphere 3.9*1015 No
Ocean soluble salts
Biomass6.9*1011
5.2*108
YesYes
Land organic matter Biota
1.1*1011
2.5*1010
SlowYes
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Roles of Nitrogen
• Plants and bacteria use nitrogen in the form of NH4
+ or NO3-
• It serves as an electron acceptor in anaerobic environment
• Nitrogen is often the most limiting nutrient in soil and water.
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Nitrogen is a key element for
• amino acids• nucleic acids (purine, pyrimidine) • cell wall components of bacteria
(NAM).
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Nitrogen Cycles
• Ammonification/mineralization• Immobilization• Nitrogen Fixation • Nitrification• Denitrification
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R-NH2
NH4 NO2
NO3NO2
NO
N2O
N2
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Which of the following is not part of the Nitrogen Cycle?A) AmmonificationB) NitrificationC) DenitrosationD) Nitrogen FixationE) Denitrification
In what form(s) do plants and bacteria use nitrogen?A) NH4
+
B) NH3
C) NO3-
D) A and CE) All of the aboveWhat is the molecular formula for ammonium? A) NH4
+
B) NH3
C) NO3
D) NO2
E) none of the above
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Ammonification or Mineralization
R-NH2
NH4 NO2
NO3NO2
NO
N2O
N2
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Mineralization or Ammonification
• Decomposers: earthworms, termites, slugs, snails, bacteria, and fungi
• Uses extracellular enzymes initiate degradation of plant polymers
• Microorganisms uses:• Proteases, lysozymes, nucleases to
degrade nitrogen containing molecules
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• Plants die or bacterial cells lyse release of organic nitrogen
• Organic nitrogen is converted to inorganic nitrogen (NH3)
• When pH<7.5, converted rapidly to NH4
• Example:
Urea NH3 + 2 CO2
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Immobilization
• The opposite of mineralization• Happens when nitrogen is limiting in the
environment• Nitrogen limitation is governed by C/N
ratio• C/N typical for soil microbial biomass is
20• C/N < 20 Mineralization• C/N > 20 Immobilization
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Nitrogen Fixation
R-NH2
NH4 NO2
NO3NO2
NO
N2O
N2
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Nitrogen Fixation
• Energy intensive process :
• N2 + 8H+ + 8e- + 16 ATP = 2NH3 + H2 + 16ADP + 16 Pi
• Performed only by selected bacteria and actinomycetes
• Performed in nitrogen fixing crops (ex: soybeans)
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Microorganisms fixing
• Azobacter• Beijerinckia• Azospirillum• Clostridium• Cyanobacteria
• Require the enzyme nitrogenase
• Inhibited by oxygen
• Inhibited by ammonia (end product)
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Rates of Nitrogen Fixation
N2 fixing system Nitrogen Fixation (kg N/hect/year)
Rhizobium-legume 200-300
Cyanobacteria- moss
30-40
Rhizosphere associations
2-25
Free- living 1-2
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Immobilization is the opposite of which process in the cycle?A) MineralizationB) NitrificationC) Immobilization D) Nitrogen FixationE) Denitrification
What process takes place when nitrogen is limiting in the environment?
A) MineralizationB) NitrificationC) Immobilization D) Nitrogen FixationE) DenitrificationWhich has the highest rate of nitrogen fixation?A) Rhizobium-legumeB) Cynaobacteria-mossC) Rhizosphere associationsD) Free-livingE) Azobacter
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Applications to wetlands
• Occur in overlying waters• Aerobic soil• Anaerobic soil• Oxidized rhizosphere• Leaf or stem surfaces of plants
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Bacterial Fixation
• Occurs mostly in salt marshes• Is absent from low pH peat of
northern bogs• Cyanobacteria found in
waterlogged soils
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Nitrification
R-NH2
NH4 NO2
NO3NO2
NO
N2O
N2
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Nitrification
Two step reactions that occur together :
• 1rst step catalyzed by Nitrosomonas2 NH4
+ + 3 O2 2 NO2- +2 H2O+ 4 H+
• 2nd step catalyzed by Nitrobacter
• 2 NO2- + O2 2 NO3
-
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• Optimal pH is between 6.6-8.0
• If pH < 6.0 rate is slowed
• If pH < 4.5 reaction is inhibited
In which type of wetlands do you thing Nitrification occurs?
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Denitrification
R-NH2
NH4 NO2
NO3NO2
NO
N2O
N2
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Denitrification
• Removes a limiting nutrient from the environment
• 4NO3- + C6H12O6 2N2 + 6 H20
• Inhibited by O2
• Not inhibited by ammonia• Microbial reaction• Nitrate is the terminal electron
acceptor
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Looking at the Nitrogen cycle through the eye
of NH4
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Denitrication is inhibited by A) NH3
B) NH4+
C) NO2-
D) O2The second step of Nitrification is catalyzed byA) NitrosomonasB) ClostridiumC) AzobacterD) NitrobacterE) Beijerinckia
Which pH is within the optimal range for nitrication?A) 1.5B) 4.6C) 7.1D) 8.7E) 10.9
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Surface water
Oxidized layer
Reduced soil layer
[NH4] HIGH
Low [NH4]
Slow Diffusion
Biodegradation
C/N <20
C/N >20
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Surface water
Oxidized layer
Reduced soil layer
[NH4] HIGH
Low [NH4]
Slow Diffusion
nitrification
[NO3] high
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Surface water
Oxidized layer
Reduced soil layer
[NO3] high
Leaching
[NO3] Low
N2
Denitrification
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PHOSPHOROUS CYCLE
Slide 41Slide 41Slide 41
GUANO
FERTILIZER
ROCKS
LAND FOOD WEBS
DISSOLVED IN OCEAN
WATER
MARINE FOOD WEBS
MARINE SEDIMENTS
weathering
agriculture
uptake by autotrophs
death, decomposition
sedimentation settling out weathering
leaching, runoff DISSOLVED IN SOIL WATER,
LAKES, RIVERS
uptake by autotrophs
death, decomposition
miningmining
excretionexcretion
Figure 4-33Page 82
uplifting over geologic time
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HUMAN IMPACTS TO PHOSPHOROUS CYCLE
1. Humans mine LARGE quantities of phosphate rock to use in commercial fertilizers and detergents. Phosphorous is NOT found as a gas, only as a solid in the earth’s crust. It takes millions to hundreds of millions of years to replenish.
2. Phosphorous is held in the tissue of the trees and vegetation, not in the soil and as we deforest the land, we remove the ability for phosphorous to replenish globally in ecosystems.
3. Cultural eutrophication – ad excess phosphate to aquatic ecosystems in runoff of animal wastes from livestock feedlots, runoff of commercial phosphate fertilizers fro cropland, and discharge of municipal sewage.
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IMPORTANCE OF PHOSPHOROUS CYCLE
• 1.Phosphorous is an essential nutrient of both plants and animals.
• 2. It is part of DNA molecules which carry genetic information.
• 3. It is part of ATP and ADP) that store chemical energy for use by organisms in cellular respiration.
• 4. Forms phospholipids in cell membranes of plants and animal cells.
• 5. Forms bones, teeth, and shells of animals as calcium phosphate compounds.
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SULFUR CYCLE
Slide 42Slide 42Slide 42
Figure 4-34Page 83
Sulfur
Hydrogen sulfide
Sulfate salts
Plants
Acidic fog and precipitation
Ammonium sulfate
Animals
Decaying matterMetallic
sulfide deposits
Ocean
Dimethyl sulfide
Sulfur dioxide Hydrogen sulfide
Sulfur trioxide Sulfuric acidWater
Ammonia
Oxygen
Volcano
Industries
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HUMAN IMPACTS TO SULFUR CYCLE
Approximately 1/3 of all sulfur emitted into atmosphere comes from human activities.
• 1. Burning sulfur containing coal and oil to produce electric power (SOx = acid deposition).
• 2. Refining petroleum – (SOx emissions)• 3. Smelting to convert sulfur compounds of
metallic minerals into free metals (Cu, Pb, Zn)• 4. Industrial processing.
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IMPORTANCE OF SULFUR CYCLE
1. Sulfur is a component of most proteins and some vitamins.
2. Sulfate ions (SO4 2- ) dissolved in water are common in plant tissue. They are part of sulfur-containing amino acids that are the building blocks for proteins.
3. Sulfur bonds give the three dimensional structure of amino acids.
4. Many animals, including humans, depend on plants for sulfur-containing amino acids.
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The Oxygen cycle
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1. The Phosphorus Cycle takesA. Short time B. 20 years to fully cycle through C. 100 years to cycle through D. Geological Timescal
2. What percentage of sulfur is emmited buy human activity?A. .01% B. 20% C. 33.3% D. 66.7% E. Over 90%
3. The vast majority of oxygen in the ecosphere is inA. Outer space B. Lithosphere C. Atmosphere D. Hydrosphere
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PHOTOSYNTHESIS
Photosynthesis: occurs within the chloroplasts of green plants. The photosynthetic membranes are arranged in flattened sacs called the thylakoids.
6CO2 + 12H2O C6H12O6 + 6O2 + 6H2O light
(reactants) (products)
Function: Chemical energy
Storage for cell use
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CELLULAR RESPIRATIONCellular Respiration occurs in light simultaneously with photosynthesis. It occurs in the cytoplasm and mitochondria.
It is the reverse reaction of photosynthesis.
Function = chemical energy release
C6H12O6 + 6O2 + 6H2O 6CO2 + 12H2O+
chemical energy
(reactants) (products)
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Primary Productivity Connection
• Gross Primary Productivity (GPP) – the rate at which an ecosystem’s producers capture and store a given amount of chemical energy as biomass in a given period of time.
• Net Primary Productivity (NPP) – the rate at which all the plants in an ecosystem produce net useful energy; equal to the difference between energy produced through photosynthesis and energy used for cellular respiration.
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“GOOD OZONE UP HIGH”
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PHOTOCHEMICAL SMOG“BAD OZONE DOWN LOW”
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OZONE DEPLETION
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ACID DEPOSITION
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CULTURAL EUTROPHICATION
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Cultural Eutrophication & Anoxia
• Eutrophication: natural process; over 1000’s of years, lakes fill in with sediment, become marshes then dry land
• Cultural Eutrophication: same process, but speeded enormously by loading with “limiting nutrients” (typically P, sometimes N)
• Problems associated with cultural eutrophication– Algal blooms – Water anoxia
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ROCK CYCLE
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HUMAN IMPACTS ON THE ROCK CYCLE
• 1. Humans are excavating minerals and removing rock material. It takes millions of years for rock to form.
• 2. Humans remove sediments for building materials. This removes sediments that may form sedimentary rocks in the future.
• 3. Humans are filling in wetlands (peatlands), area that will form future coal beds.
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1. Which part of the atmosphere is the ozone layer right above?A. Stratosphere B. Troposphere C. Mesosphere D. Thermosphere
2. How long does it take rock formations to form?A. 1,000 years B. 10,000 years C. 100,000 years D. 1,000,000 years E. 10,000,000 years
3. What is cultural eutrophication good for?A. Fish B. Dissolved Oxygen in the lake C. algae D. clear lake
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Works Cited
1. http://science.pppst.com/carboncycle.html2. westernreservepublicmedia.org/earthmotion3/
images/Carbon_Cycle.ppt3. clima-dods.ictp.it/d3/annalisa/ocean_sv/lecture1.ppt4. www.geology.wmich.edu/Koretsky/envs2150/
Pcycle_1.ppt