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
    @inproceedings{07a32d291ddc4fc0adb0d91972b41f77,
    title = "Implications of diurnal changes in leaf PRI on remote measurements of light use efficiency",
    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.",
    keywords = "Photochemical Reflectance Index, Light Use Efficiency, Boreal forest, Amazon rainforest, Pinus sylvestris, Betula Pendula, Manilkara elata",
    author = "Matti M{\~o}ttus and Juho Aalto and Luiz Arag{\~a}o and Jaana B{\"a}ck and Roc{\'i}o Hern{\'a}ndez-Clemente and Maeda, {Eduardo Eiji} and Vincent Markiet and Nichol, {Caroline J.} and {Cosme Oliveira}, Raimundo and Natalia Restrepo-Coupe and Scott Salesca",
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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 - 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 - Amazon rainforest

    KW - Pinus sylvestris

    KW - Betula Pendula

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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