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Light that plants encounter in the environment originates mostly from the sun. The spectral properties of sunlight fundamentally reflect the surface temperature of the sun (∼5800 K). However, the solar spectrum is modified by the earth’s atmosphere due to absorption by water and CO2, and by scattering. Light can either be expressed in terms of an energy flux or a quantum flux. The energy content of...
Light that plants encounter in the environment originates mostly from the sun. The spectral properties of sunlight fundamentally reflect the surface temperature of the sun (∼5800 K). However, the solar spectrum is modified by the earth’s atmosphere due to absorption by water and CO2, and by scattering. Light can either be expressed in terms of an energy flux or a quantum flux. The energy content of...
Measuring leaf light absorptance is central to many areas of plant biology including photosynthesis and energy balance. Absorptance is calculated from measured values of transmittance and reflectance, and most such measurements have used direct beam light. However, photosynthesis and other processes can differ under direct and diffuse light. Optical properties under diffuse light may be different,...
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