Extending Fluspect to simulate xanthophyll driven leaf reflectance dynamics

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652079%3A_____%2F18%3A00489468" target="_blank" >RIV/86652079:_____/18:00489468 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.rse.2018.04.012" target="_blank" >http://dx.doi.org/10.1016/j.rse.2018.04.012</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.rse.2018.04.012" target="_blank" >10.1016/j.rse.2018.04.012</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Extending Fluspect to simulate xanthophyll driven leaf reflectance dynamics

Popis výsledku v původním jazyce

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’ (C x ) 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 C x . We describe the calibration of the model and test its performance using various experimental datasets. Furthermore, we retrieved C x from optical measurements of various datasets. The retrieved C x correlates well with xanthophyll DEPS (R 2 = 0.57), as well with non-photochemical quenching (NPQ) of fluorescence (R 2 = 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.

Název v anglickém jazyce

Extending Fluspect to simulate xanthophyll driven leaf reflectance dynamics

Popis výsledku anglicky

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’ (C x ) 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 C x . We describe the calibration of the model and test its performance using various experimental datasets. Furthermore, we retrieved C x from optical measurements of various datasets. The retrieved C x correlates well with xanthophyll DEPS (R 2 = 0.57), as well with non-photochemical quenching (NPQ) of fluorescence (R 2 = 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Remote Sensing of Environment

ISSN

0034-4257

e-ISSN

—

Svazek periodika

211

Číslo periodika v rámci svazku

Jun

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

345-356

Kód UT WoS článku

000433650700027

EID výsledku v databázi Scopus

2-s2.0-85046036100