Extending Fluspect to simulate xanthophyll driven leaf reflectance dynamics

Nastassia Vilfan* (Corresponding Author), C. Van der Tol, Peiqi Yang, Rhys Wyber, Zbyněk Malenovský, Sharon A. Robinson, W. Verhoef

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

18 Citations (Scopus)

Abstract

The xanthophyll cycle regulates the energy flow to photosynthetic reaction centres of plant leaves. Changes in the de-epoxidation state (DEPS) of xanthophyll cycle pigments can be observed as changes in the leaf absorption of light with wavelengths between 500 to 570 nm. These spectral changes can be a good remote sensing indicator of the photosynthetic efficiency, and are traditionally quantified with a two-band physiologically based optical index, the Photochemical Reflectance Index (PRI). In this paper, we present an extension of the plant leaf radiative transfer model Fluspect (Fluspect-CX) that reproduces the spectral changes in a wide band of green reflectance: a radiative transfer analogy to the PRI. The idea of Fluspect-CX is to use in vivo specific absorption coefficients for two extreme states of carotenoids, representing the two extremes of the xanthophyll de-epoxidation, and to describe the intermediate states as a linear mixture of these two states. The ‘photochemical reflectance parameter’ (Cx) quantifies the relative proportion of the two states. Fluspect-CX simulates leaf chlorophyll fluorescence (ChlF) excitation-emission matrices, as well as reflectance (R) and transmittance (T) spectra as a function of leaf structure, pigment contents and Cx. We describe the calibration of the model and test its performance using various experimental datasets. Furthermore, we retrieved Cx from optical measurements of various datasets. The retrieved Cx correlates well with xanthophyll DEPS (R2 = 0.57), as well with non-photochemical quenching (NPQ) of fluorescence (R2 = 0.78). The correlation with NPQ enabled us to incorporate Fluspect-CX in the model SCOPE to scale the processes to the canopy level. Introducing the dynamic green reflectance into a radiative transfer model provides new means to study chlorophyll fluorescence and PRI dynamics on leaf and canopy scales, which is crucial for the remote sensing.

Original languageEnglish
Pages (from-to)345-356
Number of pages12
JournalRemote sensing of environment
Volume211
Early online date24 Apr 2018
DOIs
Publication statusPublished - 15 Jun 2018

Fingerprint

lutein
reflectance
Epoxidation
Radiative transfer
leaves
radiative transfer
fluorescence
Fluorescence
Chlorophyll
Pigments
remote sensing
pigment
Remote sensing
Quenching
chlorophyll
pigments
canopy
photosynthetic reaction centers
transmittance
energy flow

Keywords

  • Fluspect
  • Leaf chlorophyll fluorescence
  • PRI
  • Reflectance
  • SCOPE
  • Xanthophyll cycle
  • ITC-ISI-JOURNAL-ARTICLE

Cite this

Vilfan, Nastassia ; Van der Tol, C. ; Yang, Peiqi ; Wyber, Rhys ; Malenovský, Zbyněk ; Robinson, Sharon A. ; Verhoef, W. / Extending Fluspect to simulate xanthophyll driven leaf reflectance dynamics. In: Remote sensing of environment. 2018 ; Vol. 211. pp. 345-356.
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abstract = "The xanthophyll cycle regulates the energy flow to photosynthetic reaction centres of plant leaves. Changes in the de-epoxidation state (DEPS) of xanthophyll cycle pigments can be observed as changes in the leaf absorption of light with wavelengths between 500 to 570 nm. These spectral changes can be a good remote sensing indicator of the photosynthetic efficiency, and are traditionally quantified with a two-band physiologically based optical index, the Photochemical Reflectance Index (PRI). In this paper, we present an extension of the plant leaf radiative transfer model Fluspect (Fluspect-CX) that reproduces the spectral changes in a wide band of green reflectance: a radiative transfer analogy to the PRI. The idea of Fluspect-CX is to use in vivo specific absorption coefficients for two extreme states of carotenoids, representing the two extremes of the xanthophyll de-epoxidation, and to describe the intermediate states as a linear mixture of these two states. The ‘photochemical reflectance parameter’ (Cx) quantifies the relative proportion of the two states. Fluspect-CX simulates leaf chlorophyll fluorescence (ChlF) excitation-emission matrices, as well as reflectance (R) and transmittance (T) spectra as a function of leaf structure, pigment contents and Cx. We describe the calibration of the model and test its performance using various experimental datasets. Furthermore, we retrieved Cx from optical measurements of various datasets. The retrieved Cx correlates well with xanthophyll DEPS (R2 = 0.57), as well with non-photochemical quenching (NPQ) of fluorescence (R2 = 0.78). The correlation with NPQ enabled us to incorporate Fluspect-CX in the model SCOPE to scale the processes to the canopy level. Introducing the dynamic green reflectance into a radiative transfer model provides new means to study chlorophyll fluorescence and PRI dynamics on leaf and canopy scales, which is crucial for the remote sensing.",
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Extending Fluspect to simulate xanthophyll driven leaf reflectance dynamics. / Vilfan, Nastassia (Corresponding Author); Van der Tol, C.; Yang, Peiqi; Wyber, Rhys; Malenovský, Zbyněk; Robinson, Sharon A.; Verhoef, W.

In: Remote sensing of environment, Vol. 211, 15.06.2018, p. 345-356.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Extending Fluspect to simulate xanthophyll driven leaf reflectance dynamics

AU - Vilfan, Nastassia

AU - Van der Tol, C.

AU - Yang, Peiqi

AU - Wyber, Rhys

AU - Malenovský, Zbyněk

AU - Robinson, Sharon A.

AU - Verhoef, W.

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AB - The xanthophyll cycle regulates the energy flow to photosynthetic reaction centres of plant leaves. Changes in the de-epoxidation state (DEPS) of xanthophyll cycle pigments can be observed as changes in the leaf absorption of light with wavelengths between 500 to 570 nm. These spectral changes can be a good remote sensing indicator of the photosynthetic efficiency, and are traditionally quantified with a two-band physiologically based optical index, the Photochemical Reflectance Index (PRI). In this paper, we present an extension of the plant leaf radiative transfer model Fluspect (Fluspect-CX) that reproduces the spectral changes in a wide band of green reflectance: a radiative transfer analogy to the PRI. The idea of Fluspect-CX is to use in vivo specific absorption coefficients for two extreme states of carotenoids, representing the two extremes of the xanthophyll de-epoxidation, and to describe the intermediate states as a linear mixture of these two states. The ‘photochemical reflectance parameter’ (Cx) quantifies the relative proportion of the two states. Fluspect-CX simulates leaf chlorophyll fluorescence (ChlF) excitation-emission matrices, as well as reflectance (R) and transmittance (T) spectra as a function of leaf structure, pigment contents and Cx. We describe the calibration of the model and test its performance using various experimental datasets. Furthermore, we retrieved Cx from optical measurements of various datasets. The retrieved Cx correlates well with xanthophyll DEPS (R2 = 0.57), as well with non-photochemical quenching (NPQ) of fluorescence (R2 = 0.78). The correlation with NPQ enabled us to incorporate Fluspect-CX in the model SCOPE to scale the processes to the canopy level. Introducing the dynamic green reflectance into a radiative transfer model provides new means to study chlorophyll fluorescence and PRI dynamics on leaf and canopy scales, which is crucial for the remote sensing.

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