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@ARTICLE{Rascher:40207,
      author       = {Rascher, U. and Bobich, E. G. and Lin, G. H. and Walter, A.
                      and Morris, T. and Naumann, M. and Nichol, C. J. and Pierce,
                      D. and Bil, K. and Kudeyarov, V. and Berry, J. A.},
      title        = {{F}unctional diversity of photosynthesis during drought in
                      a model tropical rainforest - the contributions of leaf
                      area, photosynthetic electron transport and stomatal
                      conductance to reduction in net ecosystem carbon exchange},
      journal      = {Plant, cell $\&$ environment},
      volume       = {27},
      issn         = {0140-7791},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {PreJuSER-40207},
      pages        = {1239 - 1256},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The tropical rainforest mesocosm within the Biosphere 2
                      Laboratory, a model system of some 110 species developed
                      over 12 years under controlled environmental conditions,
                      has been subjected to a series of comparable drought
                      experiments during 2000–2002. In each study, the mesocosm
                      was subjected to a 4–6 week drought, with well-defined
                      rainfall events before and after the treatment. Ecosystem
                      CO2 uptake rate (Aeco) declined $32\%$ in response to the
                      drought, with changes occurring within days and being
                      reversible within weeks, even though the deeper soil layers
                      did not become significantly drier and leaf-level water
                      status of most large trees was not greatly affected. The
                      reduced Aeco during the drought reflected both morphological
                      and physiological responses. It is estimated that the
                      drought-induced $32\%$ reduction of Aeco has three principal
                      components: (1) leaf fall increased two-fold whereas leaf
                      expansion growth of some canopy dominants declined to
                      $60\%,$ leading to a $10\%$ decrease in foliage coverage of
                      the canopy. This might be the main reason for the persistent
                      reduction of Aeco after rewatering. (2) The maximum
                      photosynthetic electron transport rate at high light
                      intensities in remaining leaves was reduced to $71\%$ for
                      three of the four species measured, even though no chronic
                      photo-inhibition occurred. (3) Stomata closed, leading to a
                      reduced ecosystem water conductance to water vapour $(33\%$
                      of pre-drought values), which not only reduced ecosystem
                      carbon uptake rate, but may also have implications for water
                      and energy budgets of tropical ecosystems. Additionally,
                      individual rainforest trees responded differently,
                      expressing different levels of stress and stress avoiding
                      mechanisms. This functional diversity renders the individual
                      response heterogeneous and has fundamental implications to
                      scale leaf level responses to ecosystem dynamics.},
      cin          = {ICG-III},
      ddc          = {570},
      cid          = {I:(DE-Juel1)VDB49},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Plant Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000224283000005},
      doi          = {10.1111/j.1365-3040.2004.01231.x},
      url          = {https://juser.fz-juelich.de/record/40207},
}