Diurnal Changes in Leaf Photochemical Reflectance Index in Two Evergreen Forest Canopies

Matti Mõttus (Corresponding Author), Luiz Aragão, Jaana Bäck, Rocio Hernández-Clemente, Eduardo Eiji Maeda, Vincent Markiet

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

The spectral properties of plant leaves relate to the state of their photosynthetic apparatus and the surrounding environment. An example is the well known photosynthetic downregulation, active on the time scale from minutes to hours, caused by reversible changes in the xanthophyll cycle pigments. These changes affect leaf spectral absorption and are frequently quantified using the photochemical reflectance index (PRI). This index can be used to remotely monitor the photosynthetic status of vegetation, and allows for a global satellite-based measurement of photosynthesis. Such earth observation satellites in near-polar orbits usually cover the same geographical location at the same local solar time at regular intervals. To facilitate the interpretation of these instantaneous remote PRI measurements and upscale them temporally, we measured the daily course of leaf PRI in two evergreen biomes—a European boreal forest and an Amazon rainforest. The daily course of PRI was different for the two locations: At the Amazonian forest, the PRI of Manilkara elata leaves was correlated with the average photosynthetic photon flux density (PPFD) (R2 = 0.59, p < 0.01) of the 40 minutes preceding the leaf measurement. In the boreal location, the variations in Pinus sylvestris needle PRI were only weakly (R2 = 0.27, p < 0.05) correlated with mean PPFD of the preceding two hours; for Betula pendula, the correlation was insignificant (p > 0.5) regardless of the averaging period. The measured daily PRI curves were specific to species and/or environmental conditions. Hence, for a proper interpretation of satellite-measured instantaneous photosynthesis, the scaling of PRI measurements should be supported with information on its correlation with PPFD.
Original languageEnglish
Pages (from-to)2236-2243
JournalIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Volume12
Issue number7
DOIs
Publication statusPublished - Jul 2019
MoE publication typeA1 Journal article-refereed

Fingerprint

evergreen forest
forest canopy
reflectance
Photosynthesis
Satellites
photon flux density
Photons
photosynthesis
Fluxes
index
Pigments
rainforest
boreal forest
Orbits
pigment
Earth (planet)
environmental conditions
timescale
vegetation

Keywords

  • Amazon rainforest
  • Betula pendula
  • boreal forest
  • light use efficiency
  • Manilkara elata
  • photochemical reflectance index (PRI)
  • pinus sylvestris

Cite this

Mõttus, Matti ; Aragão, Luiz ; Bäck, Jaana ; Hernández-Clemente, Rocio ; Maeda, Eduardo Eiji ; Markiet, Vincent. / Diurnal Changes in Leaf Photochemical Reflectance Index in Two Evergreen Forest Canopies. In: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. 2019 ; Vol. 12, No. 7. pp. 2236-2243.
@article{07a2e5d5ccca4ad696f36785e8d6fce6,
title = "Diurnal Changes in Leaf Photochemical Reflectance Index in Two Evergreen Forest Canopies",
abstract = "The spectral properties of plant leaves relate to the state of their photosynthetic apparatus and the surrounding environment. An example is the well known photosynthetic downregulation, active on the time scale from minutes to hours, caused by reversible changes in the xanthophyll cycle pigments. These changes affect leaf spectral absorption and are frequently quantified using the photochemical reflectance index (PRI). This index can be used to remotely monitor the photosynthetic status of vegetation, and allows for a global satellite-based measurement of photosynthesis. Such earth observation satellites in near-polar orbits usually cover the same geographical location at the same local solar time at regular intervals. To facilitate the interpretation of these instantaneous remote PRI measurements and upscale them temporally, we measured the daily course of leaf PRI in two evergreen biomes—a European boreal forest and an Amazon rainforest. The daily course of PRI was different for the two locations: At the Amazonian forest, the PRI of Manilkara elata leaves was correlated with the average photosynthetic photon flux density (PPFD) (R2 = 0.59, p < 0.01) of the 40 minutes preceding the leaf measurement. In the boreal location, the variations in Pinus sylvestris needle PRI were only weakly (R2 = 0.27, p < 0.05) correlated with mean PPFD of the preceding two hours; for Betula pendula, the correlation was insignificant (p > 0.5) regardless of the averaging period. The measured daily PRI curves were specific to species and/or environmental conditions. Hence, for a proper interpretation of satellite-measured instantaneous photosynthesis, the scaling of PRI measurements should be supported with information on its correlation with PPFD.",
keywords = "Amazon rainforest, Betula pendula, boreal forest, light use efficiency, Manilkara elata, photochemical reflectance index (PRI), pinus sylvestris",
author = "Matti M{\~o}ttus and Luiz Arag{\~a}o and Jaana B{\"a}ck and Rocio Hern{\'a}ndez-Clemente and Maeda, {Eduardo Eiji} and Vincent Markiet",
note = "Project 117124",
year = "2019",
month = "7",
doi = "10.1109/JSTARS.2019.2891789",
language = "English",
volume = "12",
pages = "2236--2243",
journal = "IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing",
issn = "1939-1404",
publisher = "Institute of Electrical and Electronic Engineers IEEE",
number = "7",

}

Diurnal Changes in Leaf Photochemical Reflectance Index in Two Evergreen Forest Canopies. / Mõttus, Matti (Corresponding Author); Aragão, Luiz; Bäck, Jaana; Hernández-Clemente, Rocio; Maeda, Eduardo Eiji; Markiet, Vincent.

In: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol. 12, No. 7, 07.2019, p. 2236-2243.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Diurnal Changes in Leaf Photochemical Reflectance Index in Two Evergreen Forest Canopies

AU - Mõttus, Matti

AU - Aragão, Luiz

AU - Bäck, Jaana

AU - Hernández-Clemente, Rocio

AU - Maeda, Eduardo Eiji

AU - Markiet, Vincent

N1 - Project 117124

PY - 2019/7

Y1 - 2019/7

N2 - The spectral properties of plant leaves relate to the state of their photosynthetic apparatus and the surrounding environment. An example is the well known photosynthetic downregulation, active on the time scale from minutes to hours, caused by reversible changes in the xanthophyll cycle pigments. These changes affect leaf spectral absorption and are frequently quantified using the photochemical reflectance index (PRI). This index can be used to remotely monitor the photosynthetic status of vegetation, and allows for a global satellite-based measurement of photosynthesis. Such earth observation satellites in near-polar orbits usually cover the same geographical location at the same local solar time at regular intervals. To facilitate the interpretation of these instantaneous remote PRI measurements and upscale them temporally, we measured the daily course of leaf PRI in two evergreen biomes—a European boreal forest and an Amazon rainforest. The daily course of PRI was different for the two locations: At the Amazonian forest, the PRI of Manilkara elata leaves was correlated with the average photosynthetic photon flux density (PPFD) (R2 = 0.59, p < 0.01) of the 40 minutes preceding the leaf measurement. In the boreal location, the variations in Pinus sylvestris needle PRI were only weakly (R2 = 0.27, p < 0.05) correlated with mean PPFD of the preceding two hours; for Betula pendula, the correlation was insignificant (p > 0.5) regardless of the averaging period. The measured daily PRI curves were specific to species and/or environmental conditions. Hence, for a proper interpretation of satellite-measured instantaneous photosynthesis, the scaling of PRI measurements should be supported with information on its correlation with PPFD.

AB - The spectral properties of plant leaves relate to the state of their photosynthetic apparatus and the surrounding environment. An example is the well known photosynthetic downregulation, active on the time scale from minutes to hours, caused by reversible changes in the xanthophyll cycle pigments. These changes affect leaf spectral absorption and are frequently quantified using the photochemical reflectance index (PRI). This index can be used to remotely monitor the photosynthetic status of vegetation, and allows for a global satellite-based measurement of photosynthesis. Such earth observation satellites in near-polar orbits usually cover the same geographical location at the same local solar time at regular intervals. To facilitate the interpretation of these instantaneous remote PRI measurements and upscale them temporally, we measured the daily course of leaf PRI in two evergreen biomes—a European boreal forest and an Amazon rainforest. The daily course of PRI was different for the two locations: At the Amazonian forest, the PRI of Manilkara elata leaves was correlated with the average photosynthetic photon flux density (PPFD) (R2 = 0.59, p < 0.01) of the 40 minutes preceding the leaf measurement. In the boreal location, the variations in Pinus sylvestris needle PRI were only weakly (R2 = 0.27, p < 0.05) correlated with mean PPFD of the preceding two hours; for Betula pendula, the correlation was insignificant (p > 0.5) regardless of the averaging period. The measured daily PRI curves were specific to species and/or environmental conditions. Hence, for a proper interpretation of satellite-measured instantaneous photosynthesis, the scaling of PRI measurements should be supported with information on its correlation with PPFD.

KW - Amazon rainforest

KW - Betula pendula

KW - boreal forest

KW - light use efficiency

KW - Manilkara elata

KW - photochemical reflectance index (PRI)

KW - pinus sylvestris

UR - http://www.scopus.com/inward/record.url?scp=85070506943&partnerID=8YFLogxK

U2 - 10.1109/JSTARS.2019.2891789

DO - 10.1109/JSTARS.2019.2891789

M3 - Article

VL - 12

SP - 2236

EP - 2243

JO - IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

JF - IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

SN - 1939-1404

IS - 7

ER -