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@ARTICLE{Schrder:251,
      author       = {Schröder, T. and Javaux, M. and Vanderborght, J. and
                      Körfgen, B. and Vereecken, H.},
      title        = {{E}ffect of {L}ocal {S}oil {H}ydraulic {C}onductivity
                      {D}rop {U}sing a {T}hree-{D}imensional {R}oot {W}ater
                      {U}ptake {M}odel},
      journal      = {Vadose zone journal},
      volume       = {7},
      issn         = {1539-1663},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {PreJuSER-251},
      pages        = {1089 - 1098},
      year         = {2008},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The coupling of soil and root water fluxes at the plant
                      scale is a particularly challenging task. Numerical
                      three-dimensional plant-scale models exist that consider
                      these soil-root interactions. The influence of the hydraulic
                      conductivity drop at the microscopic scale and especially
                      the effect on root water uptake is not yet assessed in such
                      models. In this study, an analytical approach describing the
                      hydraulic conductivity drop from the bulk soil to the
                      soil-root interface for a three-dimensional plant-scale
                      model was derived and validated by numerical means. With
                      these tools, quantification of the local hydraulic
                      conductivity drop with time was possible. Furthermore, the
                      effect of the hydraulic conductivity drop on the time
                      occurrence of plant stress was evaluated. Root water uptake
                      was assessed, with and without considering the hydraulic
                      conductivity drop around single roots in a three-dimensional
                      plant-scale model in terms of total water uptake at the root
                      collar under different soil and root properties. It was
                      shown that the total root water uptake was strongly
                      affected, especially under conditions where the radial root
                      hydraulic conductivity, which regulates root water uptake,
                      was larger than the soil hydraulic conductivity, which
                      regulates water flow in the soil. These findings were backed
                      up by numerical validation of the model using mesh
                      refinement. Incorporation of the hydraulic conductivity drop
                      around individual roots in a three-dimensional plant-scale
                      model can solve problems with greater accuracy for larger
                      grid resolutions, and with smaller computational times, than
                      not considering the hydraulic conductivity drop.},
      keywords     = {J (WoSType)},
      cin          = {JSC / ICG-4},
      ddc          = {550},
      cid          = {I:(DE-Juel1)JSC-20090406 / I:(DE-Juel1)VDB793},
      pnm          = {Scientific Computing / Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK411 / G:(DE-Juel1)FUEK407},
      shelfmark    = {Environmental Sciences / Soil Science / Water Resources},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000258444600014},
      doi          = {10.2136/vzj2007.0114},
      url          = {https://juser.fz-juelich.de/record/251},
}