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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.

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

1 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

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

3 Variation in plant growth response to elevated CO 2 Vitousek 1994

4 Genotypic variation in elevated CO 2 response Körner 2000

5

6 II. Resource limitations of photosynthesis

7 Photosynthesis: Light-dependent and light-independent reactions http://www.digitalfrog.com/resources/archives/leaf.jpg

8 A. CO 2 response curve of photosynthesis Chapin et al. 2002 http://www.digitalfrog.com/resources/archives/leaf.jpg

9 B. Nutrient response of photosynthesis

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

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

12 Sun and shade plant adaptations to light

13 Sun vs. shade plants Fig. 7.21

14 III. Plant growth strategies A. Allocation and exponential growth

15 Körner 2006

16 Nutrient response of plant biomass 18.5

17 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

18 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Plant life history strategies – Grime’s CSR Figure 12.20 12-15 Source: after Grime 1979

19 N may limit C sequestration globally Hungate et al. 2003 Science

20 D. Plant photosynthetic strategies C3, C4, and CAM photosynthesis READING: pp. 134-139

21 C3 Photosynthesis http://www.digitalfrog.com/resources/archives/leaf.jpg

22 C4 Photosynthesis

23 C4 Distribution

24 CAM Photosynthesis

25 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

26 Controls on plant uptake of CO 2

27 End

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