Fraction of PAR ("photosynthetically active" radiation) which is made into photochemical use

Range ≤1 - 2 % of PAR
Organism Biosphere
Reference Körner C (2013) Plant-environment interactions. Chapter 12, pp.1065-1166 in: Bresinsky et al. (eds) Strasburger's plant sciences. Springer Berlin Heidelberg p.1066 right column bottom paragraph
Comments P.1066 right column bottom paragraph: "Energy Balance and Microclimate: In principle, there are four ways for a leaf to “dissipate” the energy load resulting from the absorbed radiation: (1) thermal radiation (see above), (2) photochemical use of the energy (at most 1–2% of PAR), (3) evaporative loss of water (E), and (4) energy loss by heat convection (H-dissipation of energy by mass transport by the surrounding air). During the day, only the latter two components are of importance for the energy balance of the leaf (Q)."
Entered by Uri M
ID 113224