Estimating photosynthetic capacity from leaf reflectance and Chl fluorescence by coupling radiative transfer to a model for photosynthesis
| Autor: | Christiaan van der Tol, Wouter Verhoef, Nastassia Rajh Vilfan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
0301 basic medicine Soil–Canopy Observation of Photosynthesis and Energy balance (SCOPE) reflectance Physiology Cmax Plant Science Photosynthesis 01 natural sciences 03 medical and health sciences Atmospheric radiative transfer codes Methods Radiative transfer Mathematics photosynthesis Research Fluspect Estimator GTB Teelt & Gewasfysiologie A Photosynthetic capacity Fluorescence leaf Chl fluorescence 030104 developmental biology Coupling (computer programming) Biological system V cmax 010606 plant biology & botany |
| Zdroj: | New Phytologist, 223(1), 487-500 New Phytologist 223 (2019) 1 The New Phytologist |
| ISSN: | 1469-8137 0028-646X |
| DOI: | 10.1111/nph.15782 |
| Popis: | In photosynthesis models following the Farquhar formulation, the maximum carboxylation rate V cmax is the key parameter. Remote‐sensing indicators, such as reflectance ρ and Chl fluorescence (ChlF), have been proven as valuable estimators of photosynthetic capacity and can be used as a constraint to V cmax estimation. We present a methodology to retrieve V cmax from leaf ρ and ChlF by coupling a radiative transfer model, fluspect, to a model for photosynthesis. We test its performance against a unique dataset, with combined leaf spectral, gas exchange and pulse‐amplitude‐modulated measurements. Our results show that the method can estimate the magnitude of V cmax estimated from the far‐red peak of ChlF and green ρ or transmittance τ, with values of root‐mean‐square error below 10 μmol CO 2 m−2 s−1. At the leaf level, the method could be used for detection of plant stress and tested against more extensive datasets. With a similar scheme devised for the higher spatial scales, such models could provide a comprehensive method to estimate the actual photosynthetic capacity of vegetation. |
| Databáze: | OpenAIRE |
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