I.Intro to Statistics II.Various Variables. I.Intro to Statistics A. Definitions -
I.Intro: Plant responses to elevated CO 2 ? II. Resource limitations of photosynthesis A. CO2...
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Transcript of I.Intro: Plant responses to elevated CO 2 ? II. Resource limitations of photosynthesis A. CO2...
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I. Intro: Plant responses to elevated CO2?II. Resource limitations of photosynthesis
A. CO2 responseB. Nutrient responseC. Light response curves and light adaptation
II. Plant growth strategiesA. Allocation and exponential growthB. Resource limitation and optimal foragingC. Plant growth strategiesD. Plant photosynthetic strategies
IV. Summary: Plant responses = ecosystem responses to elevated CO2?
The integrated plant: Ps & growth
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Körner 2006
I. Intro: plant responses to elevated CO2?
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Variation in plant growth response to elevated CO2
Vitousek 1994
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Genotypic variation in elevated CO2 response
Körner 2000
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Körner 2000
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II. Resource limitations of photosynthesis
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Photosynthesis: Light-dependent and light-independent reactions
http://www.digitalfrog.com/resources/archives/leaf.jpg
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A. CO2 response curve of photosynthesis
Chapin et al. 2002http://www.digitalfrog.com/resources/archives/leaf.jpg
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B. Nutrient response of photosynthesis
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C. Photosynthesis responses to light1. Photosynthetically active radiation (PAR)
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2. Response of Ps to variation in light
Fig. 6.19
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Sun and shade plant adaptations to light
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Sun vs. shade plants
Fig. 7.21
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III. Plant growth strategies
A. Allocation and exponential growth
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Körner 2006
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Nutrient response of plant biomass
18.5
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B. Resource limitation and optimal foraging
1. Maximize gain of fixed carbon
2. Need other resources to do that
3. Efficiency of resource use (“cost and revenue”)
4. Optimal allocation: co-limitation by multiple resources
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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Plant life history strategies – Grime’s CSRFigure 12.20
12-15 Source: after Grime 1979
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N may limit C sequestration globally
Hungate et al. 2003 Science
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D. Plant photosynthetic strategies
C3, C4, and CAM photosynthesis
READING: pp. 134-139
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C3 Photosynthesis
http://www.digitalfrog.com/resources/archives/leaf.jpg
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C4 Photosynthesis
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C4 Distribution
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CAM Photosynthesis
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Summary: Do plant = ecosystem responses to CO2?
1. Multiple limitations: New limitations may arise in ecosystem context not seen in individual plant experiments.
2. Allocation: Optimal foraging
3. Different strategies: tradeoffs
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Controls on plant uptake of CO2
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End