Light absorption is the first step of photosynthesis. However, measuring light absorption may be a challenge in certain types of leaves, such as needles. We propose to do it by painting the leaves with black spray prior to measurement in an integrating sphere. Check our recent paper in Tree Physiology for more details (See Publications).
Chlorophyll fluorescence and the Photochemical Reflectance Index (PRI) are related to rapid time-scale adjustments in the photosynthetic machinery. However the relationship between photosynthetic rate and these measurements has not been fully elucidated, even at the leaf scale. We conducted leaf level modelling and measurements of the dynamics of spectral chlorophyll fluorescence and the PRI, and showed that these measurements can be combined to estimate photosynthetic efficiency parameters. We recommend future strategies to scale to the canopy and landscape (you can find a PDF in our “Publications” section).
Thanks to the University of Helsinki Funds and the Academy of Finland for support!
Our Review “EUROSPEC: At the interface between Remote Sensing and CO2 flux measurements in Europe” has been recently published in Biogeosciences (See publications for a pdf copy).
In this review we contextualize and describe the main accompishments of EUROSPEC COST Action and describe the background of in situ long-term spectral measurements and their main tradeoffs. We also discuss the potential of in situ spectral measurements towards connecting CO2 flux data and satellite remote sensing data at the global scale (you can find a PDF in our “Publications” section).
Thanks to COST!
This has been a long while in our minds but finally we managed to put it together. Feedback is very welcome!
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