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Exploring the influence of canopy structural parameters and leaf chlorophyll content on passive sun induced fluorescence

Dzhaner Sami Emin

Fluorescence signal emitted by green plants originates from plant photosynthetic machinery and therefore provides an approach for directly measuring photosynthetic activity of plants. Novel methods for extracting fluorescence from high resolution hyper spectral data give opportunity to infer on plant photosynthesis using passive remote sensing techniques. Furthermore, it opens the possibility to scale up fluorescence from the leaf to the whole canopy, in this way transferring the Earth observation techniques from the domain of canopy biophysics to the realm of plant functioning.

Integrating fluorescence across the whole canopy is complicated through the relatively small signal intensity, confounding effects of canopy structure, and variability of leaf level chlorophyll content. Different leaf density, variable leaf architecture, and chlorophyll content can lead to significant variation of the outgoing fluorescence by reabsorption and multiple scattering effects. In my PhD work I will focus on understanding the link between canopy structural characteristics and the corresponding outgoing fluorescence signal recorded using airborne remote sensing platforms.


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