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@PHDTHESIS{Gangi:202655,
      author       = {Gangi, Laura},
      title        = {{R}eal-time quantification of oxygen isotope exchange
                      between carbon dioxide and leaf /soil water in terrestrial
                      ecosystems with laser-based spectroscopy},
      volume       = {266},
      school       = {Universität Bonn},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2015-04845},
      isbn         = {978-3-95806-061-6},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {XX, 156 S.},
      year         = {2015},
      note         = {Universität Bonn, Diss., 2015},
      abstract     = {The oxygen isotope ratio of atmospheric carbon dioxide
                      ($\delta^{18}$O-CO$_{2}$) can be used to partition thegross
                      fluxes of CO$_{2}$ in terrestrial ecosystems, such as soil
                      respiration and plant assimilation, asa characteristic
                      $\delta^{18}$O value is transferred to CO$_{2}$ during
                      isotopic equilibration with differentwater pools. However,
                      the quantitative use of $\delta^{18}$O-CO$_{2}$ requires a
                      detailed understanding of the different processes and
                      factors that influence the CO$_{2}$–H$_{2}$O oxygen
                      isotope exchange atdifferent scales. The effect of varying
                      environmental conditions on the $^{18}$O-exchange between
                      atmospheric CO$_{2}$ and the leaf water of different plant
                      species has been insufficiently explored in experiments, and
                      also the $\delta^{18}$O of soil efflux is fraught with
                      uncertainty due to the complex influence of soil water
                      content (SWC), soil texture and tortuosity, as well as the
                      catalytic activity of the enzyme carbonic anhydrase (CA).
                      The aim of the present study was to elucidate the
                      $^{18}$O-exchange between CO$_{2}$ and leaf/soil water under
                      controlled laboratory conditions and at a hightemporal
                      resolution. For this purpose, $\delta^{18}$O of CO$_{2}$ and
                      water vapor were measured online using infrared laser
                      spectroscopy in plant chamber experiments with spruce,
                      wheat, poplar and maize, as well as soil column experiments,
                      which included the use of gas-permeable tubing. Finally, the
                      biophysical soil–vegetation–atmosphere model MuSICA was
                      applied to simulate the $^{18}$O-exchange at the ecosystem
                      level and to test whether a value for the degree of isotopic
                      equilibrium ($\theta$) obtained from plant chamber
                      experiments was suitable for model parameterization. [...]},
      cin          = {IBG-3},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      urn          = {urn:nbn:de:0001-2015071629},
      url          = {https://juser.fz-juelich.de/record/202655},
}