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Distributions of C 3 and C 4 Plants

Distributions of C 3 and C 4 Plants. Travis Wicks. What are C 3 /C 4 Plants?. Different photosynthetic pathways. C 3 -C 4 Examples. C 3. C 4. Treesdirect.co.uk. Scientificamerican.com. Kaupag.com. En.wikipedia.org. Most plants. Warm-season grasses. Influences on Distribution.

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Distributions of C 3 and C 4 Plants

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  1. Distributions of C3 and C4 Plants Travis Wicks

  2. What are C3/C4 Plants? Different photosynthetic pathways

  3. C3-C4 Examples C3 C4 Treesdirect.co.uk Scientificamerican.com Kaupag.com En.wikipedia.org Most plants Warm-season grasses

  4. Influences on Distribution • Temperature • CO2 concentration • Precipitation patterns • Light intensity

  5. Goals Modern C4 Distribution Compare with: • Koch et al. (2004) • Still and Powell (2010)

  6. Models Koch et al. (2004) • Based on regressions on modern distributions • Purely climate-based • Inputs: • mean annual temperature • mean annual precipitation • mean summer precipitation

  7. Koch Results

  8. Models Still and Powell (2010) • Climate aspect based on experimental data • MODIS and Global Land Cover (GLC) vegetation data included • Eliminates problem of plant physiology distributions • Inputs: • Mean monthly precipitation • Mean monthly temperature • MODIS % herbaceous layer • Global Land Cover Map 2000

  9. Still and Powell Results

  10. Still and Powell Results Without GLC With GLC

  11. Still and Powell (non-GLC) Results

  12. Intermodel comparison Mean difference: 0.17 Mean difference: 0.20

  13. Conclusions • Both models have their respective problems • Hybridize the two • Other possible factors: • Fire regime • Herbivores • Are the systems truly in equilibrium? • Natural variability

  14. The End! Thanks to: -Gonzalo Espinoza -Dr. Maidment -You, for listening

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