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@ARTICLE{Koebernick:203157,
      author       = {Koebernick, Nicolai and Huber, Katrin and Kerkhofs, Elien
                      and Vanderborght, Jan and Javaux, Mathieu and Vereecken,
                      Harry and Vetterlein, Doris},
      title        = {{U}nraveling the hydrodynamics of split root water uptake
                      experiments using {CT} scanned root architectures and three
                      dimensional flow simulations},
      journal      = {Frontiers in plant science},
      volume       = {6},
      issn         = {1664-462X},
      address      = {Lausanne},
      publisher    = {Frontiers Media},
      reportid     = {FZJ-2015-05162},
      pages        = {370},
      year         = {2015},
      abstract     = {Split root experiments have the potential to disentangle
                      water transport in roots and soil, enabling the
                      investigation of the water uptake pattern of a root system.
                      Interpretation of the experimental data assumes that water
                      flow between the split soil compartments does not occur.
                      Another approach to investigate root water uptake is by
                      numerical simulations combining soil and root water flow
                      depending on the parameterization and description of the
                      root system. Our aim is to demonstrate the synergisms that
                      emerge from combining split root experiments with
                      simulations. We show how growing root architectures derived
                      from temporally repeated X-ray CT scanning can be
                      implemented in numerical soil-plant models. Faba beans were
                      grown with and without split layers and exposed to a single
                      drought period during which plant and soil water status were
                      measured. Root architectures were reconstructed from CT
                      scans and used in the model R-SWMS (root-soil water movement
                      and solute transport) to simulate water potentials in soil
                      and roots in 3D as well as water uptake by growing roots in
                      different depths. CT scans revealed that root development
                      was considerably lower with split layers compared to
                      without. This coincided with a reduction of transpiration,
                      stomatal conductance and shoot growth. Simulated predawn
                      water potentials were lower in the presence of split layers.
                      Simulations showed that this was related to an increased
                      resistance to vertical water flow in the soil by the split
                      layers. Comparison between measured and simulated soil water
                      potentials proved that the split layers were not perfectly
                      isolating and that redistribution of water from the lower,
                      wetter compartments to the drier upper compartments took
                      place, thus water losses were not equal to the root water
                      uptake from those compartments. Still, the layers increased
                      the resistance to vertical flow which resulted in lower
                      simulated collar water potentials that led to reduced
                      stomatal conductance and growth.},
      cin          = {IBG-3},
      ddc          = {570},
      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:000357011500001},
      pubmed       = {pmid:26074935},
      doi          = {10.3389/fpls.2015.00370},
      url          = {https://juser.fz-juelich.de/record/203157},
}