BIOC58H3 Lecture Notes - Phenology, Ocean Acidification, Permafrost

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15 Dec 2012
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180 industrial revolution : 270ppm 390ppm (increases in co2 levels) Benefit of co2 increase levels off after a point for c3 plants around 350ppm so we"ve see all the benefits of. C4 plants will show ed doubling of growth, not b/c of their co2 efficiency but b/c they have more efficient stomatas & water loss: they can grow more efficiently in drier areas. Normal water level tundra is a sink. Dropping it 10cm tundra becomes a net source of co2 & increases levels 4x. It acts as a (+) reinforces for the co2 levels: permafrost = active layer = source = co2. Boreal forest 3rd largest forest in the world: made up mostly of c3 plants benefit to trees is not great (0-30%) by co2, young trees show a better response than old trees. B/c the limiting factor has changed but in terms of what the factor is there is complexity.

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