Estimation of biochemical parameters from leaf photosynthesis

Ken-Loong Chew, Tim Langtry, Yakov Zinder, Qiang Yu, Longhui Li


The objective of measuring leaf photosynthesis using infrared gas analysis is to determine key indicators of plant eco-physiology, including light and CO2 compensation and saturation points, and critical thresholds of temperature. These and other biochemical parameters in photosynthesis models define specific response curves of photosynthetic rate to environmental variables, such as light intensity, temperature, and CO2. Since these parameters cannot regularly be measured in the field, modellers normally adopt laboratory values as universal ones even though the values of these parameters may vary across plant species. This study investigates the identification of parameter values from data sets obtained from field measurement.

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constrained nonlinear regression, photosynthesis rate

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