I.Intro: Plant responses to elevated CO 2 ? II. Resource limitations of photosynthesis A. CO2 response B. Nutrient response C. Light response curves and.

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I.Intro: Plant responses to elevated CO 2 ? II. Resource limitations of photosynthesis A. CO2 response B. Nutrient response C. Light response curves and light adaptation II. Plant growth strategies A.Allocation and exponential growth B.Resource limitation and optimal foraging C.Plant growth strategies D.Plant photosynthetic strategies IV. Summary: Plant responses = ecosystem responses to elevated CO 2 ? The integrated plant: Ps & growth

Körner 2006 I. Intro: plant responses to elevated CO 2 ?

Variation in plant growth response to elevated CO 2 Vitousek 1994

Genotypic variation in elevated CO 2 response Körner 2000

II. Resource limitations of photosynthesis

Photosynthesis: Light-dependent and light-independent reactions

A. CO 2 response curve of photosynthesis Chapin et al

B. Nutrient response of photosynthesis

C. Photosynthesis responses to light 1. Photosynthetically active radiation (PAR)

2. Response of Ps to variation in light Fig. 6.19

Sun and shade plant adaptations to light

Sun vs. shade plants Fig. 7.21

III. Plant growth strategies A. Allocation and exponential growth

Körner 2006

Nutrient response of plant biomass 18.5

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

Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Plant life history strategies – Grime’s CSR Figure Source: after Grime 1979

N may limit C sequestration globally Hungate et al Science

D. Plant photosynthetic strategies C3, C4, and CAM photosynthesis READING: pp

C3 Photosynthesis

C4 Photosynthesis

C4 Distribution

CAM Photosynthesis

Summary: Do plant = ecosystem responses to CO 2 ? 1. Multiple limitations: New limitations may arise in ecosystem context not seen in individual plant experiments. 2. Allocation: Optimal foraging 3. Different strategies: tradeoffs

Controls on plant uptake of CO 2

End

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