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@ARTICLE{Wieneke:908020,
      author       = {Wieneke, Sebastian and Balzarolo, Manuela and Asard, Han
                      and Abd Elgawad, Hamada and Peñuelas, Josep and Rascher,
                      Uwe and Ven, Arne and Verlinden, Melanie S. and Janssens,
                      Ivan A. and Vicca, Sara},
      title        = {{F}luorescence ratio and photochemical reflectance index as
                      a proxy for photosynthetic quantum efficiency of photosystem
                      {II} along a phosphorus gradient},
      journal      = {Agricultural and forest meteorology},
      volume       = {322},
      issn         = {0168-1923},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2022-02332},
      pages        = {109019 -},
      year         = {2022},
      abstract     = {Sun-induced chlorophyll fluorescence (SIF) is one of the
                      most promising remote-sensing signals to assess
                      spatio-temporal variation in photosynthesis. Yet, it has
                      been shown that the positive linear relationship of SIF and
                      photosynthesis, often reported from satellite and proximal
                      remote sensing, is mainly driven by the amount of absorbed
                      photosynthetic active radiation (APAR). By normalizing SIF
                      by APAR these structural first-order effects can accounted
                      for and SIF is then reflecting physiological regulation of
                      photosynthetic efficiency. However, because of the
                      confounding contribution of non-photochemical energy
                      dissipation, the relationship between SIF and photosynthetic
                      efficiency is non-linear, and therefore additional
                      measurements have to be included to constrain the
                      predictions of photosynthetic efficiency and photosynthetic
                      electron transport.},
      cin          = {IBG-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000808575200005},
      doi          = {10.1016/j.agrformet.2022.109019},
      url          = {https://juser.fz-juelich.de/record/908020},
}