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@ARTICLE{Quade:861653,
      author       = {Quade, Maria and Klosterhalfen, Anne and Graf, Alexander
                      and Brüggemann, Nicolas and Hermes, Normen and Vereecken,
                      Harry and Rothfuss, Youri},
      title        = {{I}n-situ monitoring of soil water isotopic composition for
                      partitioning of evapotranspiration during one growing season
                      of sugar beet ({B}eta vulgaris)},
      journal      = {Agricultural and forest meteorology},
      volume       = {266-267},
      issn         = {0168-1923},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2019-02097},
      pages        = {53 - 64},
      year         = {2019},
      abstract     = {Field-based quantitative observations of hydrological
                      feedbacks of terrestrial vegetation to the atmosphere are
                      crucial for improving land-surface model parametrizations.
                      This is especially true in the specific context of
                      partitioning of evapotranspiration (ET) into soil
                      evaporation (E) and plant transpiration (T): land surface
                      models are able to compute E and T separately while observed
                      transpiration fractions (T/ET) are still sparse.In this
                      study, we present the application of an on-line
                      non-destructive method based on gas-permeable tubing for the
                      in-situ collection of soil water vapor. This allowed for
                      monitoring of the hydrogen and oxygen isotopic compositions
                      (δ2H and δ18O) of soil water during a field campaign where
                      ET of sugar beet (Beta vulgaris) was partitioned. T/ET
                      estimates obtained with the non-destructive method were
                      compared with the commonly used destructive sampling of soil
                      and subsequent cryogenic extraction of soil water under
                      vacuum. Finally, isotope-based T/ET estimates were compared
                      to those obtained from a combination of micro-lysimeter and
                      eddy covariance (EC) measurements. Significant discrepancies
                      between the values of isotopic composition of evaporation
                      derived destructively and non-destructively from those of
                      soil water using a well-known transfer resistance model led
                      in turn to significant differences in T/ET. This is in line
                      with recent findings on the systematic offsets of soil water
                      isotopic composition values in relation to the water
                      sampling and extraction measurement techniques and calls for
                      further investigation of these isotopic offsets for accurate
                      separation of E from T in the field. These discrepancies
                      were, however, smaller than those observed between δ2H- or
                      δ18O-based T/ET estimates, and more than three times
                      smaller than those between isotope-based and lysimeter-based
                      estimates.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255) / IDAS-GHG - Instrumental and Data-driven
                      Approaches to Source-Partitioning of Greenhouse Gas Fluxes:
                      Comparison, Combination, Advancement (BMBF-01LN1313A)},
      pid          = {G:(DE-HGF)POF3-255 / G:(DE-Juel1)BMBF-01LN1313A},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000458468200006},
      doi          = {10.1016/j.agrformet.2018.12.002},
      url          = {https://juser.fz-juelich.de/record/861653},
}