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GEOG 205 Lecture Notes - Temperate Deciduous Forest, Terrestrial Ecosystem, Semi-Arid Climate


Department
Geography
Course Code
GEOG 205
Professor
Gail Chmura

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January 30th, 2013: Biomes
photosynthesis = 6 CO2 + 6 H2O + light C6H12O6 + O2
o occurs in green part of plant
o water comes from roots
o C6H12O6 is the basis for plant biomass
energy flows through complex food map
primary production is plants; animals are secondary production since they eat
plants
decomposers are important too
each step in the chain of consumption represents another trophic level
at every trophic level there is a release of CO2
plants also go through respiration opposite of photosynthesis
all animals respire
respiration: C6H12O6 + O2 6 CO2 + 6 H2O + energy
stomata act as plants’ pores can open and close them themselves
o must be open to perform photosynthesis through passive transport
o allow gases to enter & leave plants
when water reaches leaf, it passes through veins into a chamber which diffuses out
as gaseous water as CO2 moves in
climate feedbacks that lead to reduced precipitation
o increased concentration of CO2 in the atmosphere = plants can take it in
more efficiently, reducing the time they must keep their stomata open or
reducing the number of stomata they need
result reduced loss of water from leaves & reduced precipitation
o increased temperatures caused increased respiration of CO2 from soil
organisms (decomposers)
result increased concentration of CO2 in the atmosphere
biome: large terrestrial ecosystem characterized by specific plant communities and
formations; usually named after the predominant natural vegetation in the region;
determined by annual precipitation & average annual temperature
know the following biomes: tundra; boreal forest; temperate deciduous forest; dry
woodlands & shrublands; desert (warm, cold, semi-desert)l tropical rain forest;
temperate grasslands; tropical savanna
o don’t need to know specifics of each but know them in relation to each other
o ie/ rank in order of temperature
o I grew up in the temperate deciduous forest
Europe is the least diverse & China is the most diverse due to glaciers
there is a semi-desert in BC due to mountains separating it from tropical rainforest
moisture gradient E to W across NA at ~35 degrees N
o deciduous forest tall grass short grass temperate desert
o estuary: where ocean and river water mix
o salt marsh: type of wetland that is flooded with salty estuarine water;
doesn’t release methane
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