BIO 311D Lecture 6: Lecture 6

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7 Feb 2017
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LECTURE 6: JANUARY 30TH
Productivity
Precipitation vs. productivity (slide 85)
- Positive relationship: if the precipitation is seasonal (meaning it doesn’t rain year-round),
then you are most likely going to be unproductive compared to your counterparts with a
longer growth season. Because of this, you won’t accumulate much biomass (energy)
- Same idea applies to annual precipitation
- Data:
Note: Each dot represents a certain
location. Keep in mind that the line does
not grow exponentially. The reason being
that if it rains too much, then the law of
diminishing returns will kick in. The
same idea applies to temperature
Temperature vs. productivity
- Positive relationship: moderately high temperatures boost productivity
- Data:
Length of growing season (“photosynthetic period”) vs. productivity (slide 86)
- Positive relationship: on average, the longer the photosynthetic period, the higher the
productivity
- Data:
Nutrients vs. productivity
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