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@ARTICLE{Ananyev:40231,
      author       = {Ananyev, G. and Kolber, Z. S. and Klimov, D. and Falkowski,
                      P. G. and Berry, J. A. and Rascher, U. and Martin, J. M. and
                      Osmond, B.},
      title        = {{R}emote sensing of heterogeneity in photosynthetic
                      efficiency, electron transport and dissipation of excess
                      light in {P}opulus deltoides under ambient and elevated
                      {CO}2 concentrations, and in a tropical forest canopy, using
                      a new laser-induced ...},
      journal      = {Global change biology},
      volume       = {11},
      issn         = {1354-1013},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {PreJuSER-40231},
      pages        = {1195 - 1206},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Determining the spatial and temporal diversity of
                      photosynthetic processes in forest canopies presents a
                      challenge to the evaluation of biological feedbacks needed
                      for improvement of carbon and climate models. Limited access
                      with portable instrumentation, especially in the outer
                      canopy, makes remote sensing of these processes a priority
                      in experimental ecosystem and climate change research. Here,
                      we describe the application of a new, active, chlorophyll
                      fluorescence measurement system for remote sensing of light
                      use efficiency, based on analysis of laser-induced
                      fluorescence transients (LIFT). We used mature stands of
                      Populus grown at ambient (380 ppm) and elevated CO2
                      (1220 ppm) in the enclosed agriforests of the Biosphere 2
                      Laboratory (B2L) to compare parameters of photosynthetic
                      efficiency, photosynthetic electron transport, and
                      dissipation of excess light measured by LIFT and by standard
                      on-the-leaf saturating flash methods using a commercially
                      available pulse-modulated chlorophyll fluorescence
                      instrument (Mini-PAM). We also used LIFT to observe the diel
                      courses of these parameters in leaves of two tropical forest
                      dominants, Inga and Pterocarpus, growing in the enclosed
                      model tropical forest of B2L. Midcanopy leaves of both trees
                      showed the expected relationships among chlorophyll
                      fluorescence-derived photosynthetic parameters in response
                      to sun exposure, but, unusually, both displayed an afternoon
                      increase in nonphotochemical quenching in the shade, which
                      was ascribed to reversible inhibition of photosynthesis at
                      high leaf temperatures in the enclosed canopy. Inga
                      generally showed higher rates of photosynthetic electron
                      transport, but greater afternoon reduction in photosynthetic
                      efficiency. The potential for estimation of the contribution
                      of outer canopy photosynthesis to forest CO2 assimilation,
                      and assessment of its response to environmental stress using
                      remote sensing devices such as LIFT, is briefly discussed.},
      cin          = {ICG-III},
      ddc          = {570},
      cid          = {I:(DE-Juel1)VDB49},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Biodiversity Conservation / Ecology / Environmental
                      Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000230726600001},
      doi          = {10.1111/j.1365-2486.2005.00988.x},
      url          = {https://juser.fz-juelich.de/record/40231},
}