Abstract
In photosynthesis models following the Farquhar formulation, the maximum carboxylation rate Vcmax 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 Vcmax estimation. We present a methodology to retrieve Vcmax 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 Vcmax estimated from the far-red peak of ChlF and green ρ or transmittance τ, with values of root-mean-square error below 10 μmol CO2 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.
| Original language | English |
|---|---|
| Pages (from-to) | 487-500 |
| Number of pages | 14 |
| Journal | New Phytologist |
| Volume | 223 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Jul 2019 |
Fingerprint
Keywords
- Fluspect
- leaf Chl fluorescence
- photosynthesis
- reflectance
- Soil–Canopy Observation of Photosynthesis and Energy balance (SCOPE)
- V
Cite this
}
Estimating photosynthetic capacity from leaf reflectance and Chl fluorescence by coupling radiative transfer to a model for photosynthesis. / Vilfan, Nastassia; van der Tol, Christiaan; Verhoef, Wouter.
In: New Phytologist, Vol. 223, No. 1, 01.07.2019, p. 487-500.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Estimating photosynthetic capacity from leaf reflectance and Chl fluorescence by coupling radiative transfer to a model for photosynthesis
AU - Vilfan, Nastassia
AU - van der Tol, Christiaan
AU - Verhoef, Wouter
PY - 2019/7/1
Y1 - 2019/7/1
N2 - In photosynthesis models following the Farquhar formulation, the maximum carboxylation rate Vcmax 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 Vcmax estimation. We present a methodology to retrieve Vcmax 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 Vcmax estimated from the far-red peak of ChlF and green ρ or transmittance τ, with values of root-mean-square error below 10 μmol CO2 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.
AB - In photosynthesis models following the Farquhar formulation, the maximum carboxylation rate Vcmax 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 Vcmax estimation. We present a methodology to retrieve Vcmax 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 Vcmax estimated from the far-red peak of ChlF and green ρ or transmittance τ, with values of root-mean-square error below 10 μmol CO2 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.
KW - Fluspect
KW - leaf Chl fluorescence
KW - photosynthesis
KW - reflectance
KW - Soil–Canopy Observation of Photosynthesis and Energy balance (SCOPE)
KW - V
U2 - 10.1111/nph.15782
DO - 10.1111/nph.15782
M3 - Article
VL - 223
SP - 487
EP - 500
JO - New Phytologist
JF - New Phytologist
SN - 0028-646X
IS - 1
ER -