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@BOOK{Schickling:20447,
      author       = {Schickling, Anke},
      title        = {{R}emote sensing of sun-induced fluorescence for improved
                      modeling of gross primary productivity in a heterogeneous
                      agricultural area},
      volume       = {134},
      school       = {Universität Köln},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-20447},
      isbn         = {978-3-89336-775-7},
      series       = {Schriften des Forschungszentrums Jülich : Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      year         = {2012},
      note         = {Record converted from VDB: 12.11.2012; Universität Köln,
                      Diss., 2011},
      abstract     = {Gross primary productivity (GPP) is an important parameter
                      to quantify carbon fixation by plant ecosystems. To
                      determine GPP at different spatial scales, remote sensing
                      (RS) offers the unique possibility to provide information
                      from local to global scales. Attempts to estimate GPP from
                      RS data focus on the light-use efficiency (LUE) concept of
                      Monteith that relates GPP to the absorbed photosynthetically
                      active radiation and the efficiency of plant canopies to
                      utilize the absorbed radiation for photosynthesis. To
                      reliably predict GPP at different spatio-temporal scales,
                      LUE has to be linked to optical remote sensing parameters
                      that detect variations in photosynthetic efficiency as a
                      result of changes in environmental conditions. In this study
                      two optical remote sensing parameters were investigated for
                      their potential to serve as a proxy for LUE: the sun-induced
                      fluorescence yield derived from the oxygen absorption
                      O$_{2}$-A band at 760 nm (Fs$_{760}$-yield) and the
                      photochemical reflectance index (PRI). Both parameters were
                      derived from two ASD FieldSpec spectrometers that were
                      operated in parallel, one above the vegetation canopy of
                      either a winter wheat or a sugar beet field and one from a
                      small research aircraft. Based on the LUE concept of
                      Monteith GPP was calculated on a diurnal basis including
                      optical parameters derived from ground observations and
                      compared to simultaneously acquired GPP data from the eddy
                      covariance method. The results showed that the diurnal
                      response of physiological regulation of photosynthesis to
                      changing environmental conditions could be tracked reliably
                      with the Fs$_{760}$-yield or a combination of the
                      Fs760-yield and the PRI. Moreover, the airborne observations
                      were used to characterize the spatial variations of
                      Fs$_{760}$-yield, PRI and GPP of different fields at a
                      regional observation site over the course of a day. Results
                      of this spatio-temporal investigation revealed a significant
                      variability of GPP between different winter wheat fields
                      compared to the within-field variability. For sugar beet the
                      results also showed an increase of the within-field
                      variability in the afternoon in addition to the significant
                      between-field variability. It could be shown that optical RS
                      parameters are sufficiently sensitive to detect a reduction
                      of photosynthetic CO$_{2}$ uptake due to stomatal closure.
                      In the sugar beet canopy this regulation of photosynthesis
                      caused a reduction of GPP in the afternoon ranging from 25
                      \% to 33 \% in comparison to maximum GPP values in the
                      morning.},
      cin          = {IEK-8},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      typ          = {PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/20447},
}