% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Khare:908400,
      author       = {Khare, Deepanshu and Selzner, Tobias and Leitner, Daniel
                      and Vanderborght, Jan and Vereecken, Harry and Schnepf,
                      Andrea},
      title        = {{R}oot {S}ystem {S}cale {M}odels {S}ignificantly
                      {O}verestimate {R}oot {W}ater {U}ptake at {D}rying {S}oil
                      {C}onditions},
      journal      = {Frontiers in Functional Plant Ecology},
      volume       = {13},
      issn         = {1664-462X},
      address      = {Lausanne},
      publisher    = {Frontiers Media},
      reportid     = {FZJ-2022-02590},
      pages        = {798741},
      year         = {2022},
      abstract     = {Soil hydraulic conductivity (ksoil) drops significantly in
                      dry soils, resulting in steep soil water potential gradients
                      (ψs) near plant roots during water uptake. Coarse soil grid
                      resolutions in root system scale (RSS) models of root water
                      uptake (RWU) generally do not spatially resolve this
                      gradient in drying soils which can lead to a large
                      overestimation of RWU. To quantify this, we consider a
                      benchmark scenario of RWU from drying soil for which a
                      numerical reference solution is available. We analyze this
                      problem using a finite volume scheme and investigate the
                      impact of grid size on the RSS model results. At dry
                      conditions, the cumulative RWU was overestimated by up to
                      $300\%$ for the coarsest soil grid of 4.0 cm and by $30\%$
                      for the finest soil grid of 0.2 cm, while the computational
                      demand increased from 19 s to 21 h. As an accurate and
                      computationally efficient alternative to the RSS model, we
                      implemented a continuum multi-scale model where we keep a
                      coarse grid resolution for the bulk soil, but in addition,
                      we solve a 1-dimensional radially symmetric soil model at
                      rhizosphere scale around individual root segments. The
                      models at the two scales are coupled in a mass-conservative
                      way. The multi-scale model compares best to the reference
                      solution $(−20\%)$ at much lower computational costs of
                      4min. Our results demonstrate the need to shift to improved
                      RWU models when simulating dry soil conditions and highlight
                      that results for dry conditions obtained with RSS models of
                      RWU should be interpreted with caution.},
      cin          = {IBG-3},
      ddc          = {570},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217) / Advancing structural-functional modelling of
                      root growth and root-soilinteractions based on automatic
                      reconstruction of root systems fromMRI (274830790) / EXC
                      2070:  PhenoRob - Robotics and Phenotyping for Sustainable
                      Crop Production (390732324) / BonaRes - (Modul A, Phase 2):
                      Soil3-II - Nachhaltiges Unterbodenmanagement, Teilprojekt C
                      (031B0515C)},
      pid          = {G:(DE-HGF)POF4-2173 / G:(GEPRIS)274830790 /
                      G:(BMBF)390732324 / G:(BMBF)031B0515C},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:35237283},
      UT           = {WOS:000761659600001},
      doi          = {10.3389/fpls.2022.798741},
      url          = {https://juser.fz-juelich.de/record/908400},
}