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@ARTICLE{Rabbel:857175,
      author       = {Rabbel, Inken and Bogena, Heye and Neuwirth, Burkhard and
                      Diekkrüger, Bernd},
      title        = {{U}sing {S}ap {F}low {D}ata to {P}arameterize the {F}eddes
                      {W}ater {S}tress {M}odel for {N}orway {S}pruce},
      journal      = {Water},
      volume       = {10},
      number       = {3},
      issn         = {2073-4441},
      address      = {Basel},
      publisher    = {MDPI},
      reportid     = {FZJ-2018-06412},
      pages        = {279 -},
      year         = {2018},
      abstract     = {Tree water use is a key variable in forest eco-hydrological
                      studies and is often monitored by sap flow measurements.
                      Upscaling these point measurements to the stand or catchment
                      level, however, is still challenging. Due to the
                      spatio-temporal heterogeneity of stand structure and soil
                      water supply, extensive measuring campaigns are needed to
                      determine stand water use from sap flow measurements alone.
                      Therefore, many researchers apply water balance models to
                      estimate stand transpiration. To account for the effects of
                      limited soil water supply on stand transpiration, models
                      commonly refer to plant water stress functions, which have
                      rarely been parameterized for forest trees. The aim of this
                      study was to parameterize the Feddes water stress model for
                      Norway spruce (Picea abies [L.] Karst.). After successful
                      calibration and validation of the soil hydrological model
                      HYDRUS-1D, we combined root-zone water potential simulations
                      with a new plant water stress factor derived from sap flow
                      measurements at two plots of contrasting soil moisture
                      regimes. By calibrating HYDRUS-1D against our sap flow data,
                      we determined the critical limits of soil water supply.
                      Drought stress reduced the transpiration activity of mature
                      Norway spruce at root-zone pressure heads <−4100 cm, while
                      aeration stress was not observed. Using the recalibrated
                      Feddes parameters in HYDRUS-1D also improved our water
                      balance simulations. We conclude that the consideration of
                      sap flow information in soil hydrological modeling is a
                      promising way towards more realistic water balance
                      simulations in forest ecosystems},
      cin          = {IBG-3},
      ddc          = {690},
      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)16},
      UT           = {WOS:000428516000044},
      doi          = {10.3390/w10030279},
      url          = {https://juser.fz-juelich.de/record/857175},
}