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Leaf Reflectance & Absorption

Explore the role of leaf reflectance and absorption in tropical grasslands, including the impact of plant pigments and liquid water absorption on photosynthesis. Discover the intricate structures and functions within leaves and how they affect optical properties. Delve into the importance of CO2 and O2 exchange for efficient photosynthesis.

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Leaf Reflectance & Absorption

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  1. Leaf Reflectance & Absorption

  2. “Pimple” Savannaforms from termite mounds in innundated tropical grasslands Leaf Reflectance & Absorption

  3. Beltsville winter wheat

  4. True & False Color Photos In true-color, grass and astroturf look similar; in the near-infrared, grass is more reflective grass Truecolorfilm grass astroturf astroturf Colorinfraredfilm

  5. Plant Pigments So, what absorbs in functioning leaves? None of the key pigments absorbs green light; instead it is reflected to our eyes, which makes plants look green to us.

  6. Liquid Water Absorption Liquid water in plant leaves completes the absorption picture: leaves must be hydrated for photosynthesis

  7. Green LeafStructure

  8. Dicot and Conifer Leaves Bean leaf x420 Pine needle x370

  9. Maple & Pine reflectancel Similar in visible light, different in the near-IR maple pine

  10. Leaf Reflectance & Absorption Reflectance = 1.0 - Absorption Banana x1400 Cucumber x490

  11. Leaf Photosynthesis Photosynthesis Determines Optical Properties Bean leaf x4200

  12. Leaf Photosynthesis Photosynthesis Determines Optical Properties Must capture photons to drive chemical reactions (energy input) Must be in presence of H2O Must be in presence of CO2 Must get rid of O2 (poisonous) Must live in hostile setting…

  13. Internal Leaf Structure Intercellular air labyrinth CO2 in & O2 out Chloroplasts

  14. Leaf Reflectance & Absorption Photosynthesis requires CO2 from atmosphere to be in contact with the plant cell surfaces. The intercellular labyrinth allows movement of CO2 into leaves and O2 out. Part of the “deal” is H2O is lost

  15. Leaf Photosynthesis Stomata regulate gas exchange and water loss CO2 in/O2 out

  16. Leaf Photosynthesis Piers Seller’s PAR Diagram

  17. Photosynthesis Action Spectrum

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