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Lecture 19

Lecture 19 Notes

7 Pages
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Department
Biology
Course Code
BIO220H1
Professor
James Thomson

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Lecture 19: Biogeochemical Cycles
Slide 1
Manhattan Project second largest military venture in the world up to that
time; big project in WW2 that resulted in the atomic bomb
Largest military venture Boeing B29 long distance bomber project to
deliver the atom bomb in Japan
Slide 2
US went from atomic bomb to hydrogen bomb (more powerful); b29 to b36
(bigger)
Could make guesses about where the compounds would go
oHot Strontium is beside Calcium on the periodic table, so it would
probably go with our bone just like Calcium
Slide 3
What happens if we put a strong gamma emitter (Cs137) in the middle
of a forestÉ
oKilled the forest outward in concentric circles and all the vegetation died
(didn’t even rot because there were no microbes there to break it down)
Oak and Pine trees were the most sensitive
Slide 4
You can introduce an unstable radioactive isotope into an ecosystem and
trace tiny quantities of it to various sources (not done anymore)
Slide 5
Potassium behaves like phosphorus
Slide 6
Elements aren’t created or destroyed but they do change chemical form
Pool the format in which the element sits in for a while
Flux way in which the element moves from one pool to another
Slide 7
Strong natural fluxes a lot of flow along that line
Slide 8
Big chunk of the C cycle is in CO2 form --> gaseous and very water soluble in
oceans
Two main places for C[email protected] to exist are atmosphere and oceans, outside the
biological world
The third is in ocean sediments and limestone rock
Combustion of fossil fuels We take organic carbon, burn it, and then turn
into atmospheric CO2 and release it
Extraction of fossil fuels Sedimentary carbon that we burn for power such
as transportation
Ocean Sediments lot of CO2 ends up here because many marine mammals
incorporate CO2 in their shells/protective coverings
Rock lot of CO2 ends up in the bottom of the ocean as sedimentary rocks
which are brought up by geological uplift
Terrestrial communities - food chain and trophic ecology is a small part of
the carbon cycle
oEating a rabbit that has eaten a piece of grass; some of the carbon from
the grass spends some time in the rabbit and also in the human;
eventually we breathe out CO2 and it becomes grass again
oThis is carbon cycling in terrestrial communities
oRound arrow --> recycling through plants and animals being eaten
Slide 9
After agriculture is established, burning continues to be used to try to keep
grasslands from going into forest mode and getting rid of agricultural waste
An intact forest sequesters a lot of carbon in organic molecules
Clearing by humans causes this stuff to get burned for fuel or to get it out of the
way and this sequestered carbon goes into the atmosphere as CO2
Slide 10
Grasses have become much more important than they previously were and this
is due to active removal of forests
Slide 11
Successful using stone axes
Slide 13
Showing the idea that clearing forest for growing crops was a feasible construct
even with very primitive tools

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Description
Lecture 19 Biogeochemical Cycles Slide 1Manhattan Projectsecond largest military venture in the world up to that time big project in WW2 that resulted in the atomic bombLargest military ventureBoeing B29 long distance bomber project to deliver the atom bomb in JapanSlide 2US went from atomic bomb to hydrogen bomb more powerful b29 to b36 biggerCould make guesses about where the compounds would gooHot Strontium is beside Calcium on the periodic table so it would probably go with our bone just like Calcium Slide 3What happens if we put a strong gamma emitter Cs137 in the middle of a forestoKilled the forest outward in concentric circles and all the vegetation died didnt even rot because there were no microbes there to break it downOak and Pine trees were the most sensitiveSlide 4You can introduce an unstable radioactive isotope into an ecosystem and trace tiny quantities of it to various sourcesnot done anymoreSlide 5Potassium behaves like phosphorusSlide 6Elements arent created or destroyed but they do change chemical form Poolthe format in which the element sits in for a whileFluxway in which the element moves from one pool to another Slide 7
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