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@ARTICLE{Colombo:848308,
      author       = {Colombo, Roberto and Celesti, Marco and Bianchi, Remo and
                      Campbell, Petya K. E. and Cogliati, Sergio and Cook, Bruce
                      D. and Corp, Lawrence A. and Damm, Alexander and Domec,
                      Jean-Christophe and Guanter, Luis and Julitta, Tommaso and
                      Middleton, Elizabeth M. and Noormets, Asko and Panigada,
                      Cinzia and Pinto, Francisco and Rascher, Uwe and Rossini,
                      Micol and Schickling, Anke},
      title        = {{V}ariability of sun-induced chlorophyll fluorescence
                      according to stand age-related processes in a managed
                      loblolly pine forest},
      journal      = {Global change biology},
      volume       = {24},
      number       = {7},
      issn         = {1354-1013},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {FZJ-2018-03553},
      pages        = {2980 - 2996},
      year         = {2018},
      abstract     = {Leaf fluorescence can be used to track plant development
                      and stress, and is considered the most direct measurement of
                      photosynthetic activity available from remote sensing
                      techniques. Red and far‐red sun‐induced chlorophyll
                      fluorescence (SIF) maps were generated from high spatial
                      resolution images collected with the HyPlant airborne
                      spectrometer over even‐aged loblolly pine plantations in
                      North Carolina (United States). Canopy fluorescence yield
                      (i.e., the fluorescence flux normalized by the light
                      absorbed) in the red and far‐red peaks was computed. This
                      quantifies the fluorescence emission efficiencies that are
                      more directly linked to canopy function compared to SIF
                      radiances. Fluorescence fluxes and yields were investigated
                      in relation to tree age to infer new insights on the
                      potential of those measurements in better describing
                      ecosystem processes. The results showed that red
                      fluorescence yield varies with stand age. Young stands
                      exhibited a nearly twofold higher red fluorescence yield
                      than mature forest plantations, while the far‐red
                      fluorescence yield remained constant. We interpreted this
                      finding in a context of photosynthetic stomatal limitation
                      in aging loblolly pine stands. Current and future satellite
                      missions provide global datasets of SIF at coarse spatial
                      resolution, resulting in intrapixel mixture effects, which
                      could be a confounding factor for fluorescence signal
                      interpretation. To mitigate this effect, we propose a
                      surrogate of the fluorescence yield, namely the Canopy Cover
                      Fluorescence Index (CCFI) that accounts for the spatial
                      variability in canopy structure by exploiting the vegetation
                      fractional cover. It was found that spatial aggregation
                      tended to mask the effective relationships, while the CCFI
                      was still able to maintain this link. This study is a first
                      attempt in interpreting the fluorescence variability in
                      aging forest stands and it may open new perspectives in
                      understanding long‐term forest dynamics in response to
                      future climatic conditions from remote sensing of SIF.},
      cin          = {IBG-2},
      ddc          = {570},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {582 - Plant Science (POF3-582)},
      pid          = {G:(DE-HGF)POF3-582},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:29460467},
      UT           = {WOS:000437281500021},
      doi          = {10.1111/gcb.14097},
      url          = {https://juser.fz-juelich.de/record/848308},
}