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@ARTICLE{Wieneke:856576,
      author       = {Wieneke, S. and Burkart, A. and Cendrero-Mateo, M. P. and
                      Julitta, T. and Rossini, M. and Schickling, A. and Schmidt,
                      Marius and Rascher, U.},
      title        = {{L}inking photosynthesis and sun-induced fluorescence at
                      sub-daily to seasonal scales},
      journal      = {Remote sensing of environment},
      volume       = {219},
      issn         = {0034-4257},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-05950},
      pages        = {247 - 258},
      year         = {2018},
      abstract     = {Due to its close link to the photosynthetic process,
                      sun-induced chlorophyll fluorescence (F) opens new
                      possibilities to study dynamics of photosynthetic light
                      reactions and to quantify CO2 assimilation rates. Although
                      recent studies show that F is linearly related to gross
                      primary production (GPP) on coarse spatial and temporal
                      scales, it is argued that this relationship may be mainly
                      driven by seasonal changes in absorbed photochemical active
                      radiation (APAR) and less by the plant light use efficiency
                      (LUE).In this work a high-resolution spectrometer was used
                      to continuously measure red and far-red fluorescence and
                      different reflectance indices within a sugar beet field
                      during the growing season in 2015. Diurnal and seasonal
                      developments were compared to eddy covariance derived
                      GPP.Additionally, part of the time series coincided with a
                      heatwave. The induced drought stress allowed us to observe F
                      and its relationship to GPP under changing environmental
                      conditions during the seasonal cycle.Across the season a
                      strong linear relationship between GPP and F760 was found.
                      This relationship however, was mainly driven by changes in
                      APAR and was strongly reduced under drought conditions. We
                      could show that far-red fluorescence yield can explain
                      $59\%$ of the diurnal and $79\%$ of the seasonal variance in
                      the light use efficiency. However, an even stronger
                      relationship between FY760 and the structural vegetation
                      index MTVI2 was found, implying that FY760 is affected by
                      seasonal structural changes of the canopy. Nevertheless, the
                      seasonally de-trended FY760 and PRI show that they share
                      strong interdependencies with seasonal and diurnal LUE, in
                      particular under drought stress conditions.},
      cin          = {IBG-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {582 - Plant Science (POF3-582)},
      pid          = {G:(DE-HGF)POF3-582},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000450379200018},
      doi          = {10.1016/j.rse.2018.10.019},
      url          = {https://juser.fz-juelich.de/record/856576},
}