1. The Radiation Environment and Plant Canopies

4. Leaf Interactions with Incoming Solar Radiation
Reflectance
Absorbance
Transmittance

6. The amount of reflectance depends on the nature of the leaf surface

7. Absorbance:
Epidermis as focusing lens
Absorbance of red and blue
Cuticle and phenolic compounds absorb UV

8. Transmittance
Depends on structure and thickness of leaves
Red/green shade
Red/far red ratio (phytochrome)

9. Phytochrome has two interconvertible forms: Pr and Pfr

11. Leaf Area Index (LAI) = Total Leaf Area/Ground Area