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Solar Radiation and Productivity in Tropical Ecosystems

Solar Radiation and Productivity in Tropical Ecosystems. J. L. Monteith. Thermal Dynamics Law. First Law of Thermal Dynamics: Energy conservation R n =LE + H + G+A Second Law of Thermal Dynamics: Production of “useful” energy must be accompanied by simultaneous “waste” of heat.

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Solar Radiation and Productivity in Tropical Ecosystems

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  1. Solar Radiation and Productivity in Tropical Ecosystems J. L. Monteith

  2. Thermal Dynamics Law • First Law of Thermal Dynamics: Energy conservation Rn=LE + H + G+A • Second Law of Thermal Dynamics: Production of “useful” energy must be accompanied by simultaneous “waste” of heat.

  3. Components of Efficiency ε=εgεaεsεqεiεdεr Where the components include geometric, atmospheric, spectral, quantum, interception, diffusion and respiration efficiencies

  4. Geometric efficiency

  5. Atmospheric Efficiency

  6. Spectral Efficiency • PAR to total radiation ratio: 50%

  7. Quantum Efficiency • Theoretical maximum: 1 Carbohydrate need 10 quanta.

  8. Diffusion Efficiency

  9. Interception Efficiency

  10. Respiration Efficiency W: standing dry weight (g/m^2) P: photosynthesis rate (g/m^2/day)

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