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@ARTICLE{Vanderborght:904455,
      author       = {Vanderborght, Jan and Couvreur, Valentin and Meunier,
                      Felicien and Schnepf, Andrea and Vereecken, Harry and Bouda,
                      Martin and Javaux, Mathieu},
      title        = {{F}rom hydraulic root architecture models to macroscopic
                      representations of root hydraulics in soil water flow and
                      land surface models},
      journal      = {Hydrology and earth system sciences},
      volume       = {25},
      number       = {9},
      issn         = {1027-5606},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2021-06025},
      pages        = {4835 - 4860},
      year         = {2021},
      abstract     = {Root water uptake is an important process in the
                      terrestrial water cycle. How this process depends on soil
                      water content, root distributions, and root properties is a
                      soil–root hydraulic problem. We compare different
                      approaches to implement root hydraulics in macroscopic soil
                      water flow and land surface models. By upscaling a
                      three-dimensional hydraulic root architecture model, we
                      derived an exact macroscopic root hydraulic model. The
                      macroscopic model uses the following three characteristics:
                      the root system conductance, Krs, the standard uptake
                      fraction, SUF, which represents the uptake from a soil
                      profile with a uniform hydraulic head, and a compensatory
                      matrix that describes the redistribution of water uptake in
                      a non-uniform hydraulic head profile. The two
                      characteristics, Krs and SUF, are sufficient to describe the
                      total uptake as a function of the collar and soil water
                      potential, and water uptake redistribution does not depend
                      on the total uptake or collar water potential. We compared
                      the exact model with two hydraulic root models that make a
                      priori simplifications of the hydraulic root architecture,
                      i.e., the parallel and big root model. The parallel root
                      model uses only two characteristics, Krs and SUF, which can
                      be calculated directly following a bottom-up approach from
                      the 3D hydraulic root architecture. The big root model uses
                      more parameters than the parallel root model, but these
                      parameters cannot be obtained straightforwardly with a
                      bottom-up approach. The big root model was parameterized
                      using a top-down approach, i.e., directly from root segment
                      hydraulic properties, assuming a priori a single big root
                      architecture. This simplification of the hydraulic root
                      architecture led to less accurate descriptions of root water
                      uptake than by the parallel root model. To compute root
                      water uptake in macroscopic soil water flow and land surface
                      models, we recommend the use of the parallel root model with
                      Krs and SUF computed in a bottom-up approach from a known 3D
                      root hydraulic architecture.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000693695500002},
      doi          = {10.5194/hess-25-4835-2021},
      url          = {https://juser.fz-juelich.de/record/904455},
}