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@ARTICLE{Schrder:153441,
      author       = {Schröder, Natalie and Lazarovitch, Naftali and
                      Vanderborght, Jan and Vereecken, Harry and Javaux, Mathieu},
      title        = {{L}inking transpiration reduction to rhizosphere salinity
                      using a 3{D} coupled soil-plant model},
      journal      = {Plant and soil},
      volume       = {377},
      number       = {1-2},
      issn         = {1573-5036},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V},
      reportid     = {FZJ-2014-03048},
      pages        = {277 - 293},
      year         = {2014},
      abstract     = {Aims: Soil salinity can cause salt plant stress by reducing
                      plant transpiration and yield due to very low osmotic
                      potentials in the soil. For predicting this reduction, we
                      present a simulation study to (i) identify a suitable
                      functional form of the transpiration reduction function and
                      (ii) to explain the different shapes of empirically observed
                      reduction functions.MethodsWe used high resolution
                      simulations with a model that couples 3D water flow and salt
                      transport in the soil towards individual roots with flow in
                      the root system.ResultsThe simulations demonstrated that the
                      local total water potential at the soil-root interface, i.e.
                      the sum of the matric and osmotic potentials, is for a given
                      root system, uniquely and piecewise linearly related to the
                      transpiration rate. Using bulk total water potentials, i.e.
                      spatially and temporally averaged potentials in the soil
                      around roots, sigmoid relations were obtained. Unlike for
                      the local potentials, the sigmoid relations were non-unique
                      functions of the total bulk potential but depended on the
                      contribution of the bulk osmotic potential.ConclusionsTo a
                      large extent, Transpiration reduction is controlled by water
                      potentials at the soil-root interface. Since spatial
                      gradients in water potentials around roots are different for
                      osmotic and matric potentials, depending on the root density
                      and on soil hydraulic properties, transpiration reduction
                      functions in terms of bulk water potentials cannot be
                      transferred to other conditions, i.e. soil type, salt
                      content, root density, beyond the conditions for which they
                      were derived. Such a transfer could be achieved by
                      downscaling to the soil-root interface using simulations
                      with a high resolution process model.},
      cin          = {IBG-3},
      ddc          = {570},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255) / 246 - Modelling and Monitoring Terrestrial
                      Systems: Methods and Technologies (POF2-246)},
      pid          = {G:(DE-HGF)POF3-255 / G:(DE-HGF)POF2-246},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000333614600019},
      doi          = {10.1007/s11104-013-1990-8},
      url          = {https://juser.fz-juelich.de/record/153441},
}