Implications of diurnal changes in leaf PRI on remote measurements of light use efficiency

Matti Mõttus, Juho Aalto, Luiz Aragão, Jaana Bäck, Rocío Hernández-Clemente, Eduardo Eiji Maeda, Vincent Markiet, Caroline J. Nichol, Raimundo Cosme Oliveira, Natalia Restrepo-Coupe, Scott Salesca

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

The spectral properties of plant leaves reflect the state of their photosynthetic apparatus and the surrounding environment. A well-known mechanism of photosynthetic downregulation, active on the time scale from minutes to hours, is 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 thus be used to monitor the photosynthetic status of the vegetation canopy, potentially from a large distance, and allows for a global satellite-based monitoring 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 scale them to longer timescales, we measured the daily course of leaf PRI in two evergreen biomes: European boreal forest and Amazon rainforest. The daily course of PRI was different for the two locations. In Amazon, PRI was driven by incident Photosynthetic Photon Flux Density (PPFD). In the boreal location, PRI and PPFD were decoupled and PRI indicated downregulation only in the afternoon. This downregulation was confirmed with carbon exchange measurements. The study demonstrates the utility of biome-specific daily PRI curves for scaling instantaneous remote measurements to daily values and comparing data acquired at different times of day.

Original languageEnglish
Title of host publication2018 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2018 - Proceedings
PublisherIEEE Institute of Electrical and Electronic Engineers
Pages9007-9010
Number of pages4
ISBN (Electronic)978-1-5386-7150-4, 978-1-5386-7149-8
ISBN (Print)978-1-5386-7151-1
DOIs
Publication statusPublished - 5 Nov 2018
MoE publication typeNot Eligible
EventIEEE International Geoscience and Remote Sensing Symposium, IGARSS 2018 - Valencia, Spain
Duration: 22 Jul 201827 Jul 2018

Conference

ConferenceIEEE International Geoscience and Remote Sensing Symposium, IGARSS 2018
Abbreviated titleIGARSS
CountrySpain
CityValencia
Period22/07/1827/07/18

Fingerprint

light use efficiency
reflectance
photon flux density
biome
timescale
index
rainforest
boreal forest
pigment
photosynthesis
canopy
vegetation

Keywords

  • Photochemical Reflectance Index
  • Light Use Efficiency
  • Boreal forest
  • Amazon rainforest
  • Pinus sylvestris
  • Betula Pendula
  • Manilkara elata

Cite this

Mõttus, M., Aalto, J., Aragão, L., Bäck, J., Hernández-Clemente, R., Maeda, E. E., ... Salesca, S. (2018). Implications of diurnal changes in leaf PRI on remote measurements of light use efficiency. In 2018 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2018 - Proceedings (pp. 9007-9010). IEEE Institute of Electrical and Electronic Engineers . https://doi.org/10.1109/IGARSS.2018.8517554
Mõttus, Matti ; Aalto, Juho ; Aragão, Luiz ; Bäck, Jaana ; Hernández-Clemente, Rocío ; Maeda, Eduardo Eiji ; Markiet, Vincent ; Nichol, Caroline J. ; Cosme Oliveira, Raimundo ; Restrepo-Coupe, Natalia ; Salesca, Scott. / Implications of diurnal changes in leaf PRI on remote measurements of light use efficiency. 2018 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2018 - Proceedings. IEEE Institute of Electrical and Electronic Engineers , 2018. pp. 9007-9010
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Mõttus, M, Aalto, J, Aragão, L, Bäck, J, Hernández-Clemente, R, Maeda, EE, Markiet, V, Nichol, CJ, Cosme Oliveira, R, Restrepo-Coupe, N & Salesca, S 2018, Implications of diurnal changes in leaf PRI on remote measurements of light use efficiency. in 2018 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2018 - Proceedings. IEEE Institute of Electrical and Electronic Engineers , pp. 9007-9010, IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2018, Valencia, Spain, 22/07/18. https://doi.org/10.1109/IGARSS.2018.8517554

Implications of diurnal changes in leaf PRI on remote measurements of light use efficiency. / Mõttus, Matti; Aalto, Juho; Aragão, Luiz; Bäck, Jaana; Hernández-Clemente, Rocío; Maeda, Eduardo Eiji; Markiet, Vincent; Nichol, Caroline J.; Cosme Oliveira, Raimundo; Restrepo-Coupe, Natalia; Salesca, Scott.

2018 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2018 - Proceedings. IEEE Institute of Electrical and Electronic Engineers , 2018. p. 9007-9010.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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AU - Mõttus, Matti

AU - Aalto, Juho

AU - Aragão, Luiz

AU - Bäck, Jaana

AU - Hernández-Clemente, Rocío

AU - Maeda, Eduardo Eiji

AU - Markiet, Vincent

AU - Nichol, Caroline J.

AU - Cosme Oliveira, Raimundo

AU - Restrepo-Coupe, Natalia

AU - Salesca, Scott

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N2 - The spectral properties of plant leaves reflect the state of their photosynthetic apparatus and the surrounding environment. A well-known mechanism of photosynthetic downregulation, active on the time scale from minutes to hours, is 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 thus be used to monitor the photosynthetic status of the vegetation canopy, potentially from a large distance, and allows for a global satellite-based monitoring 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 scale them to longer timescales, we measured the daily course of leaf PRI in two evergreen biomes: European boreal forest and Amazon rainforest. The daily course of PRI was different for the two locations. In Amazon, PRI was driven by incident Photosynthetic Photon Flux Density (PPFD). In the boreal location, PRI and PPFD were decoupled and PRI indicated downregulation only in the afternoon. This downregulation was confirmed with carbon exchange measurements. The study demonstrates the utility of biome-specific daily PRI curves for scaling instantaneous remote measurements to daily values and comparing data acquired at different times of day.

AB - The spectral properties of plant leaves reflect the state of their photosynthetic apparatus and the surrounding environment. A well-known mechanism of photosynthetic downregulation, active on the time scale from minutes to hours, is 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 thus be used to monitor the photosynthetic status of the vegetation canopy, potentially from a large distance, and allows for a global satellite-based monitoring 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 scale them to longer timescales, we measured the daily course of leaf PRI in two evergreen biomes: European boreal forest and Amazon rainforest. The daily course of PRI was different for the two locations. In Amazon, PRI was driven by incident Photosynthetic Photon Flux Density (PPFD). In the boreal location, PRI and PPFD were decoupled and PRI indicated downregulation only in the afternoon. This downregulation was confirmed with carbon exchange measurements. The study demonstrates the utility of biome-specific daily PRI curves for scaling instantaneous remote measurements to daily values and comparing data acquired at different times of day.

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KW - Light Use Efficiency

KW - Boreal forest

KW - Amazon rainforest

KW - Pinus sylvestris

KW - Betula Pendula

KW - Manilkara elata

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Mõttus M, Aalto J, Aragão L, Bäck J, Hernández-Clemente R, Maeda EE et al. Implications of diurnal changes in leaf PRI on remote measurements of light use efficiency. In 2018 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2018 - Proceedings. IEEE Institute of Electrical and Electronic Engineers . 2018. p. 9007-9010 https://doi.org/10.1109/IGARSS.2018.8517554