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@ARTICLE{Landl:891017,
      author       = {Landl, Magdalena and Phalempin, Maxime and Schlüter,
                      Steffen and Vetterlein, Doris and Vanderborght, Jan and
                      Kroener, Eva and Schnepf, Andrea},
      title        = {{M}odeling the {I}mpact of {R}hizosphere {B}ulk {D}ensity
                      and {M}ucilage {G}radients on {R}oot {W}ater {U}ptake},
      journal      = {Frontiers in agronomy},
      volume       = {3},
      issn         = {2673-3218},
      address      = {Lausanne},
      publisher    = {Frontiers Media},
      reportid     = {FZJ-2021-01313},
      pages        = {622367},
      year         = {2021},
      abstract     = {In models of water flow in soil and roots, differences in
                      the soil hydraulic properties of the rhizosphere and the
                      bulk soil are usually neglected. There is, however, strong
                      experimental evidence that rhizosphere and bulk soil
                      hydraulic properties differ significantly from each other
                      due to various root-soil interaction processes. Two such
                      processes, which can also influence each other, are
                      rhizosphere loosening or compaction and mucilage deposition.
                      In this work, we identified realistic gradients in
                      rhizosphere bulk density and mucilage concentration using
                      X-ray CT imaging, respectively, model simulation for two
                      different soil types and soil bulk densities and related
                      them to soil hydraulic parameters. Using a 1D-single-root
                      model, we then evaluated both the individual and combined
                      effects of these gradients on soil water dynamics using
                      scenario simulations. We showed that during soil drying, a
                      lower rhizosphere bulk density leads to an earlier onset of
                      water stress and to a reduced root water uptake that is
                      sustained longer. The presence of mucilage led to a faster
                      reduction of root water uptake. This is due to the stronger
                      effect of mucilage viscosity on hydraulic conductivity
                      compared to the mucilage- induced increase in water
                      retention. Root water uptake was rapidly reduced when both
                      mucilage and rhizosphere bulk density gradients were
                      considered. The intensity of the effect of gradients in
                      rhizosphere bulk density and mucilage concentration depended
                      strongly on the interplay between initial soil hydraulic
                      conditions, soil type and soil bulk densities. Both
                      gradients in rhizosphere bulk density and mucilage
                      concentration appear as a measure to sustain transpiration
                      at a lower level and to avoid fast dehydration.},
      cin          = {IBG-3},
      ddc          = {630},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217) / DFG project 403641034 - Modellierung von
                      Selbstorganisation in der Rhizosphäre},
      pid          = {G:(DE-HGF)POF4-2173 / G:(GEPRIS)403641034},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001009890900001},
      doi          = {10.3389/fagro.2021.622367},
      url          = {https://juser.fz-juelich.de/record/891017},
}