% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@INPROCEEDINGS{Matveeva:190159,
      author       = {Matveeva, Maria and Schickling, Anke and Rascher, Uwe and
                      Pinto, Francisco and Cendrero, Pilar and Rademske, Patrick
                      and Colombo, Roberto and Celesti, Marco and Panigada, Cinzia
                      and Cogliati, Sergio and Miglietta, Franco and Alonso, Luis
                      and Moreno, José and Damm, Alexander and Mohammed, Gina and
                      Schuettemeyer, Dirk},
      title        = {{E}arly indication of plant stresses by changes in
                      vegetation indices and fluorescence},
      reportid     = {FZJ-2015-03090},
      year         = {2015},
      abstract     = {Photosynthesis dynamically adapts to changing environmental
                      conditions. Extreme environmental conditions such as high
                      temperature and water limitation directly reflect in the
                      photosynthetic performance as vegetation stress. To monitor
                      photosynthesis dynamics at large vegetation scales,
                      indicators of stresses in vegetation extracted by
                      non-invasive techniques can be used.Spectral reflectance
                      indices such as NDVI and PRI have been tested to provide
                      rapid and non-invasive estimation of photosynthesis at
                      regional scales. Unfortunately, these indices lack
                      sensitivity to short-term vegetation physiological changes.
                      Alternatively, a passive retrieval of sun-induced
                      chlorophyll fluorescence (SIF) using high performance
                      imaging spectroscopy has been suggested. SIF emission is
                      closely related to the status of photosynthesis and
                      therefore has the potential to track adaptation of this
                      process to changes in environmental conditions and plant
                      status. Although SIF emission represents a weak signal in
                      comparison to the reflected radiation, recent research
                      provides evidence that SIF can be measured by exploiting
                      solar and atmospheric absorption lines using high
                      performance spectrometers.In this contribution, we present
                      the design and first results of an experiment that aimed to
                      evaluate the capability of the new remote observable SIF and
                      common reflectance based indices to detect plant stress. In
                      the experiment, carried out in June and July 2014 in
                      Latisana (Italy), we treated homogeneous lawn plots to
                      provoke different level of stress in plants. In particular,
                      we applied the herbicide (Dicuran) in different
                      concentrations to four plots, three other plots were treated
                      with the anti-transpirant Vaporgard; while three remaining
                      plots were not treated and used as control. Diurnal
                      variations in SIF and surface reflectance were evaluated for
                      period of two weeks, using the high performance imaging
                      spectrometer HyPlant. HyPlant is a dedicated fluorescence
                      spectrometer and allows measuring radiance in the wavelength
                      range between 400 nm and 2500 nm with a high spectral
                      resolution of 0.26 nm between 670 nm and 780 nm. Data was
                      recorded for spatial resolution of 1 meter per
                      pixel.Airborne data was calibrated and validated using high
                      resolution top of canopy measurements of reflectance and
                      SIF. Vegetation indices and SIF were calculated for treated
                      and non-treated areas and compared with corresponding ground
                      measurements. Additional measurements of CO2 and H2O fluxes
                      using chambers and an eddy covariance tower to monitor
                      photosynthetic activity were performed.First results show
                      contrasting responses of emitted SIF and vegetation indices
                      for plant stress: SIF strongly increased after the treatment
                      with Dicuran followed by a slow decrease down to the initial
                      values. The Meris Terrestrial Chlorophyll Index (MTCI)
                      showed a clear decrease after the herbicide treatment. We
                      conclude that SIF is a promising new observable sensitive to
                      plant stress which provides complementary information to
                      commonly used remote observables origin form reflectance
                      spectroscopy. We suggest a combined use of SIF and
                      reflectance spectroscopy to establish reliable approaches
                      for rapid, early, and non-invasive plant stress detection.},
      month         = {Apr},
      date          = {2015-04-14},
      organization  = {9th EARSel Imaging Spectroscopy
                       Workshop, Luxembourg (Luxembourg), 14
                       Apr 2015 - 16 Apr 2015},
      subtyp        = {After Call},
      cin          = {IBG-2},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {582 - Plant Science (POF3-582)},
      pid          = {G:(DE-HGF)POF3-582},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/190159},
}