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GEOG 205 (26)

January 30th

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McGill University
GEOG 205
Gail Chmura

January 30 , 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 n
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