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Distribution of C3 and C4 Plants: Understanding Photosynthetic Pathways and Influences

This overview explores the distribution of C3 and C4 plants, shedding light on their distinct photosynthetic pathways. C3 plants, typical in cooler climates, and C4 plants, found in warmer regions, are influenced by factors such as temperature, CO2 concentration, precipitation patterns, and light intensity. Through models by Koch et al. (2004) and Still and Powell (2010), we compare climate-based factors affecting plant distributions. We aim to identify potential hybrid models that integrate physiological and climatic data for a comprehensive understanding of plant distribution dynamics.

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Distribution of C3 and C4 Plants: Understanding Photosynthetic Pathways and Influences

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Presentation Transcript

  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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