• Author: Mänd, Pille

    University of Tartu (EE)

  • Author: Hallik, Lea

    University of Tartu (EE)

  • Author: Peñuelas, Josep

    Universitat Autònoma de Barcelona (ES)

  • Author: Nilson, Tiit

    Tartu Observatory (EE)

  • Author: Duce, Pierpaolo

    Consiglio Nazionale delle Ricerche, CNR–IBIMET (IT)

  • Author: Emmett, Bridget A.

    Centre for Ecology and Hydrology—Bangor, Environment Centre Wales (GB)

  • Author: Beier, Claus

    Ecosystems, Biosystems Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark

  • Author: Estiarte, Marc

    Universitat Autònoma de Barcelona (ES)

  • Author: Garadnai, János

    Hungarian Academy of Sciences

  • Author: Kalapos, Tibor

    Loránd Eötvös University (HU)

  • Author: Schmidt, Inger Kappel

    University of Copenhagen

  • Author: Kovács-Láng, Edit

    Hungarian Academy of Sciences

  • Author: Prieto, Patricia

    Universitat Autònoma de Barcelona (ES)

  • Author: Tietema, Albert

    University of Amsterdam

  • Author: Westerveld, Joke W.

    University of Amsterdam

  • Author: Kull, Olevi

    University of Tartu

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The aim of this study was to evaluate the use of ground-based canopy reflectance measurements to detect changes in physiology and structure of vegetation in response to experimental warming and drought treatment at six European shrublands located along a North–South climatic gradient. We measured canopy reflectance, effective green leaf area index (green LAIe) and chlorophyll fluorescence of dominant species. The treatment effects on green LAIe varied among sites. We calculated three reflectance indices: photochemical reflectance index PRI [531 nm; 570 nm], normalized difference vegetation index NDVI680 [780 nm; 680 nm] using red spectral region, and NDVI570 [780 nm; 570 nm] using the same green spectral region as PRI. All three reflectance indices were significantly related to green LAIe and were able to detect changes in shrubland vegetation among treatments. In general warming treatment increased PRI and drought treatment reduced NDVI values. The significant treatment effect on photochemical efficiency of plants detected with PRI could not be detected by fluorescence measurements. However, we found canopy level measured PRI to be very sensitive to soil reflectance properties especially in vegetation areas with low green LAIe. As both soil reflectance and LAI varied between northern and southern sites it is problematic to draw universal conclusions of climate-derived changes in all vegetation types based merely on PRI measurements. We propose that canopy level PRI measurements can be more useful in areas of dense vegetation and dark soils.
Original languageEnglish
JournalRemote Sensing of Environment
Publication date2010
Volume114
Issue3
Pages626-636
ISSN0034-4257
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 10

Keywords

  • Bio systems, Environment and climate
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