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@ARTICLE{Schrder:22885,
      author       = {Schröder, N. and Javaux, M. and Vanderborght, J. and
                      Steffen, B. and Vereecken, H.},
      title        = {{E}ffect of {R}oot {W}ater and {S}olute {U}ptake on
                      {A}pparent {S}oil {D}ispersivity: {A} {S}imulation {S}tudy},
      journal      = {Vadose zone journal},
      volume       = {11},
      issn         = {1539-1663},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {PreJuSER-22885},
      pages        = {.},
      year         = {2012},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Plants take up water from the root zone and thus affect the
                      three-dimensional water flow field and solute transport
                      processes in the soil. In this study, the impacts of root
                      architecture, plant solute uptake mechanisms (passive,
                      active, and solute exclusion), and plant transpiration rate
                      on the water flow field in the soil and on solute spreading
                      were simulated. Therefore, a fully mechanistic model was
                      used to simulate water flow along water potential gradients
                      in the root-soil continuum by coupling a three-dimensional
                      Richards equation in the soil with a flow equation in the
                      root xylem vessels. Solute transport was simulated using a
                      three-dimensional random walk particle tracking algorithm.
                      To quantify the effect of root water and nutrient uptake on
                      solute transport, an equivalent one-dimensional flow and
                      transport model was fitted to horizontally averaged
                      simulation results, and the fitted apparent parameters were
                      compared with the parameters of the three-dimensional model.
                      Our simulation results showed that the apparent dispersivity
                      length is affected by the heterogeneous flow field, caused
                      by root water uptake, and changed in a range of $50\%,$
                      depending on solute redistribution in the root zone that
                      depends on solute uptake type and soil dispersivity length.
                      In addition, simulation results indicate that local
                      concentration gradients within the root zone have an impact
                      on apparent solute uptake rate parameters used in
                      one-dimensional models to calculate uptake rates from
                      spatially averaged concentrations. This shows the importance
                      of small scale three-dimensional water and solute fluxes
                      induced by root water and nutrient uptake.},
      keywords     = {J (WoSType)},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Environmental Sciences / Soil Science / Water Resources},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000308526800030},
      doi          = {10.2136/vzj2012.0009},
      url          = {https://juser.fz-juelich.de/record/22885},
}